Misplaced Pages

#177822

119-571: Stretching for 250 kilometers (160 mi), it is the second-longest fault in California, and one of the most prominent geological features in the southern part of the state. It marks the northern boundary of the area known as the Mojave Block, as well as the southern ends of the Sierra Nevada and the valleys of the westernmost Basin and Range province . The Garlock Fault runs from a junction with

238-584: A drought. In 2014–2015, farm-related losses in California totaled $ 5 billion and 20,000 farmers also lost their jobs. Agriculture is the primary industry in most of the Central Valley. A notable exception is the Sacramento area, which hosts a large and stable workforce of government employees. Despite state hiring cutbacks and the closure of several military bases, Sacramento's economy has continued to expand and diversify and now more closely resembles that of

357-521: A foreman working for Sacramento pioneer John Sutter , found shiny metal in the tailrace of a lumber mill Marshall was building for Sutter on the American River . Rumors soon started to spread and were confirmed in March 1848 by San Francisco newspaper publisher and merchant Samuel Brannan . Brannan strode through the streets of San Francisco, holding aloft a vial of gold, shouting "Gold! Gold! Gold from

476-486: A greater difference in the land in a shorter amount of time. According to a survey paper written in 1988 about a storm that occurred in 1982 in the Central Valley region, rainstorms that can cause that type of landslide to happen about every 5 years. Landslides to higher degrees, such as the ones that happened due to the 1982 storm, only occur every 20 to 100+ years. This intense storm in the San Francisco Bay area caused

595-419: A lot of damage as a result of moving debris and landslides. They caused damage to the land and put people living in these areas that are susceptible to these disasters in great harm. The aftermath of this storm involved millions of dollars in retributions to restore the land and surrounding areas. It also led people to make greater efforts into planning around the danger of these landslides, as in how to manipulate

714-489: A name still often seen in scientific references (notably Great Valley Sequence ), as well as "Golden Empire", a booster name that is still referred to by some organizations (notably Golden Empire Transit , Golden Empire Council ). Ideas about what constitutes the “Central Valley” can vary from person-to-person. While almost all authoritative sources and external observers consider the Sacramento Valley to be part of

833-487: A particularly active fault , seldom producing any shaking detectable by humans, although it has been known to generate sympathetic seismic events when triggered by other earthquakes and in one instance by the removal of ground water . These events, as well as continuing microearthquake activity and the state of the scarps from previous ruptures, do indicate that the Garlock will produce another major quake at some point in

952-553: A portion of the area, a triangle whose vertices are Reno, Nevada ; Fresno, California ; and Las Vegas, Nevada , has been dubbed the " Nevada Triangle ", in reference to the Bermuda Triangle . Some counts put the number of crashes in the triangle at 2,000, including millionaire and record-breaking flyer Steve Fossett . Hypotheses that the crashes are related in some way to the United States Air Force 's Area 51 , or to

1071-448: A powerful stream or jet of water at gold-bearing gravel beds. It is estimated that by the mid-1880s, 11 million troy ounces (340 metric tons) of gold (worth approximately US$ 16 billion in 2020 prices) had been recovered by "hydraulicking". A consequence of these extraction methods was that large amounts of gravel, silt , heavy metals , and other pollutants were washed into streams and rivers. As of 1999 , many areas still bear

1190-682: A publication of his photographs under the title Parmelian Prints of the High Sierras , commented, "The name Sierra is already a plural. To add an s is a linguistic, Californian, and mountaineering sin." The Sierra Nevada lies primarily in Central and Eastern California , with the Carson Range , a small but historically important spur, extending into Nevada. West-to-east, the Sierra Nevada's elevation increases gradually from 500 feet (150 m) in

1309-934: A series of pumps that divert water into the California Aqueduct , which runs south along the length of the San Joaquin Valley. In parallel, pumps divert water into the Delta–Mendota Canal . The flow of the Sacramento River is further supplemented by a tunnel from the Trinity River (a tributary of the Klamath River , northwest of the Sacramento Valley) near Redding . Cities of the San Francisco Bay Area , also needing water, built aqueducts from

SECTION 10

#1732844394178

1428-501: A short period, and the lightning can start fires. Summer high temperatures average 42–90 °F (6–32 °C). Winters are comparatively mild, and the temperature is usually only just low enough to sustain a heavy snowpack. For example, Tuolumne Meadows , at 8,600 feet (2,600 m) elevation, has winter daily highs about 40 °F (4 °C) with daily lows about 10 °F (−12 °C). The growing season lasts 20 to 230 days, strongly dependent on elevation. The highest elevations of

1547-470: Is Fresno followed by the state capital Sacramento . The following metropolitan and micropolitan statistical areas are listed from largest to smallest: After English and Spanish , Punjabi is the third most commonly spoken language in the Central Valley. The valley has the largest Sikh population in the nation . The flatness of the valley floor contrasts with the rugged hills or gentle mountains that are typical of most of California's terrain. The valley

1666-447: Is Mount Lyell (13,120 ft or 3,999 m). The Sierra rises to almost 14,000 feet (4,300 m) with Mount Humphreys near Bishop, California . Finally, near Lone Pine , Mount Whitney is at 14,505 feet (4,421 m), the highest point in the contiguous United States . South of Mount Whitney, the elevation of the range quickly dwindles. The crest elevation is almost 10,000 feet (3,000 m) near Lake Isabella , but south of

1785-929: Is a mountain range in the Western United States , between the Central Valley of California and the Great Basin . The vast majority of the range lies in the state of California , although the Carson Range spur lies primarily in Nevada . The Sierra Nevada is part of the American Cordillera , an almost continuous chain of mountain ranges that forms the western "backbone" of the Americas. The Sierra runs 400 mi (640 km) north-south, and its width ranges from 50 mi (80 km) to 80 mi (130 km) across east–west. Notable features include General Sherman ,

1904-572: Is bounded by the Coast Ranges to the west and the Sierra Nevada to the east. The Central Valley is a region known for its agricultural productivity . It provides a large share of the food produced in California. California provides more than half of the fruits, vegetables, and nuts grown in the United States. More than 7,000,000 acres (28,000 km ) of the valley are irrigated via reservoirs and canals. The valley hosts many cities, including

2023-456: Is either protected from development or strictly managed. The mountain range is home to three National Parks  – Yosemite , Kings Canyon , and Sequoia  – and two national monuments  – Devils Postpile and Giant Sequoia . Ten national forests span much of the mountain range's remaining area. Within these national parks, monuments, and forests lie 26 wilderness areas , which together protect 15.4% of

2142-531: Is higher in the east. A list of biotic zones, and corresponding elevations, is presented below: Archaeological excavations placed Martis people of Paleo-Indians in northcentral Sierra Nevada during the period of 3,000 BCE to 500 CE. The earliest identified sustaining indigenous people in the Sierra Nevada were the Northern Paiute tribes on the east side, with the Mono tribe and Sierra Miwok tribe on

2261-442: Is ideal for agriculture. The Central Valley is one of the United States' most productive growing regions. This is made possible by engineering the watercourses to prevent flooding during the spring snowmelt and drying up in the summer and autumn. Many dams, including Shasta Dam , Oroville Dam , Folsom Dam , New Melones Dam , Don Pedro Dam , Hetch Hetchy Dam , Friant Dam , Pine Flat Dam and Isabella Dam , were constructed on

2380-497: Is life-threatening or even fatal. Due to the agricultural industry's significant presence in the Valley, pesticide drift and leaching have become concerns. Residents risk contamination when living in proximity to application sites. Air pollution is a growing problem that affects all of the citizens in the Central Valley. Some reasons of poor air pollution in the Central Valley are due to agriculture and its geographical features. Since

2499-403: Is now San Francisco Bay . Over the millennia, the valley filled with the sediments of these same ranges, as well as the rising Sierra Nevada to the east; that filling eventually created an extraordinary flatness just barely above sea level. Before California's flood control and aqueduct system was built, annual snow melt turned much of the valley into an inland sea. The one notable exception to

SECTION 20

#1732844394178

2618-481: Is part of the larger Pacific Border province, which in turn is part of the Pacific Mountain System . The Central Valley was formerly a diverse expanse of grassland, containing areas of prairie , desert grassland (at the southern end), oak savanna , riparian forest , marsh , several types of seasonal vernal pools , and large lakes such as now-dry Tulare Lake (once the largest freshwater lake west of

2737-399: Is released every Thursday, showing which parts of the U.S. are in a drought. It started in 2000, and since then the longest duration of a drought in California lasted a total of 376 weeks. It started on December 11, 2011, and ended on March 5, 2019. The most intense period captured on the drought monitor was on the week of July 29, 2014. It showed that 58.41% of California's land was affected by

2856-635: Is the source of much of the sedimentary rock in California. In the Cretaceous , a subduction zone formed at the edge of the continent. This means that an oceanic plate started to dive beneath the North American Plate . Magma, formed through the subduction of the ancient Farallon Plate , rose in plumes ( plutons ) deep underground, their combined mass forming what is called the Sierra Nevada batholith . These plutons formed at various times, from 115  Ma to 87 Ma. The earlier plutons formed in

2975-534: Is thought to have originated below sea level as an offshore area depressed by subduction of the Farallon Plate into a trench farther offshore. The valley has no earthquake faults of its own but is surrounded by faults to the east and west. The valley was enclosed by the uplift of the Coast Ranges , with its original outlet into Monterey Bay . Faulting moved the Coast Ranges, and a new outlet developed near what

3094-445: Is very hot and dry during the summer and cool and damp in winter when frequent ground fog known regionally as " tule fog " can obscure vision. Summer daytime temperatures frequently surpass 100 °F (38 °C), and common heat waves might bring temperatures exceeding 115 °F (46 °C). Mid-autumn to mid-spring is the rainy season —although during the late summer, southeasterly winds can bring tropical thunderstorms, mainly in

3213-458: The Basin and Range Province . As this andesitic volcanism began waning about five million years ago, the rivers were able to begin eroding away the 100s of meters of volcanic deposits and resume the incision that had been halted by the first period of volcanism. Some studies have argued that this recent incision is a sign of recent tectonic uplift. Other geologists claim that the elevations of many of

3332-634: The Carson River runs into Carson Sink , the Walker River into Walker Lake ; Rush , Lee Vining and Mill Creeks flow into Mono Lake ; and the Owens River into dry Owens Lake . Although none of the eastern rivers reach the sea, many of the streams from Mono Lake southwards are diverted into the Los Angeles Aqueduct which provides water to Southern California . The height of the mountains in

3451-481: The Central Valley to more than 14,000 feet (4,300 m) atop the highest peaks of its crest 50 to 75 miles (80 to 121 km) to the east. The east slope forms the steep Sierra Escarpment . Unlike its surroundings, the range receives a substantial amount of snowfall and precipitation due to orographic lift . The Sierra Nevada's irregular northern boundary stretches from the Susan River and Fredonyer Pass to

3570-528: The Golden Gate . Many of the islands lie below sea level because of intensive agriculture, and face a high risk of flooding, which would allow salt water to rush back into the delta, especially when too little fresh water is flowing in from the Valley. The Sacramento River carries far more water than the San Joaquin, with an estimated 22 million acre-feet (27 km ) of virgin annual runoff, as compared to

3689-568: The Mokelumne River and Tuolumne River that run east to west across the middle part of the Central Valley. Most valley lowlands are prone to flooding, especially in the old Tulare Lake , Buena Vista Lake , and Kern Lake rivers. The Kings , Kaweah , Tule and Kern rivers originally flowed into these seasonal lakes, which would expand each spring to flood large parts of the southern San Joaquin Valley. Farms, towns, and infrastructure in these lakebeds are protected with levee systems, while

Garlock Fault - Misplaced Pages Continue

3808-590: The Nevadan orogeny , granite formed deep underground. The range started to uplift less than five million years ago, and erosion by glaciers exposed the granite and formed the light-colored mountains and cliffs that make up the range. The uplift caused a wide range of elevations and climates in the Sierra Nevada, which are reflected by the presence of five life zones (areas with similar plant and animal communities). Uplift continues due to faulting caused by tectonic forces, creating spectacular fault block escarpments along

3927-587: The North Fork Feather River . It represents where the granitic bedrock of the Sierra Nevada dives below the southern extent of Cenozoic igneous surface rock from the Cascade Range . It is bounded on the west by California 's Central Valley , on the east by the Basin and Range Province , and on the southeast by the Mojave Desert . The southern boundary is at Tehachapi Pass . Physiographically,

4046-605: The San Andreas Fault in the Antelope Valley , eastward to a junction with the Death Valley Fault Zone in the eastern Mojave Desert. It is named after the historic mining town of Garlock , founded in 1894 by Eugene Garlock and now a ghost town . Relatively few communities lie directly along the Garlock, as it is primarily situated in the desert, with Frazier Park , Tehachapi , Mojave , and Johannesburg being

4165-516: The San Joaquin Valley to the rest of the state in the 1870s. This facilitated the nationwide distribution of lumber. In addition, technological advancements, such as the shay locomotive and the v-shaped log flume , made it easier to transport lumber across mountainous terrain. The tourism potential of the Sierra Nevada was recognized early in the European history of the range. Yosemite Valley

4284-513: The Tehachapi Mountains . Riverside trees include willows, western sycamore ( Platanus racemosa ), box elder ( Acer negundo ), Fremont cottonwood ( Populus fremontii ), and the endemic valley oak ( Quercus lobata ). Another endemic species is brittlescale ( Atriplex depressa ) which grows in saline and alkali soils. The Central Valley was once home to large populations of pronghorn antelope ( Antilocapra americana ), elk including

4403-526: The United States started to move to California via Sonora and Walker Passes . In the winter of 1844, Lt. John C. Frémont , accompanied by Kit Carson , was the first European American to see Lake Tahoe . The Frémont party camped at 8,050 ft (2,450 m). The California Gold Rush began at Sutter's Mill , near Coloma , in the western foothills of the Sierra. On January 24, 1848, James W. Marshall,

4522-457: The endorheic basin of Tulare Lake , which rarely overflows into the San Joaquin during wet years. The eastern slope watershed of the Sierra is much narrower; its rivers flow out into the endorheic Great Basin of eastern California and western Nevada . From north to south, the Susan River flows into intermittent Honey Lake , the Truckee River flows from Lake Tahoe into Pyramid Lake ,

4641-716: The American River!" On August 19, 1848, the New York Herald was the first major newspaper on the East Coast to report the discovery of gold. On December 5, 1848, President James Polk confirmed the discovery of gold in an address to Congress . Soon, waves of immigrants from around the world, later called the "forty-niners", invaded the Gold Country of California or "Mother Lode". Miners lived in tents, wood shanties, or deck cabins removed from abandoned ships. Wherever gold

4760-417: The Central Valley consists mostly of farming land, a wide, flat valley, the emissions from the soil that is used for growing produce are released into the air. The soil exudes nitrous oxide , an odorless and colorless gas that can be harmful when exposed to it for a long period of time, and incorporates itself into the ozone layer located at ground level. Production of nitrous oxide in California has shown that

4879-453: The Central Valley produces 8 percent of the nation's agricultural output by value: US$ 43.5 billion in 2013. California's farms and ranches earned almost $ 50 billion in 2018. The valley's productivity relies on irrigation from surface water and badly depleted underground aquifers . About one-sixth of the US' irrigated land is in the Central Valley. Virtually all non-tropical crops are grown in

Garlock Fault - Misplaced Pages Continue

4998-523: The Central Valley, which cause 312 landslides to move that year. Slow-moving landslides are impacted even if the intensity of the rainfall is not as severe. Consistent, moderately intense rainfall increases the saturation of water in the ground. This over-saturation is what causes the movement of a slow-moving landslide, rather than the more quick-moving and rigorous landslides that also occur in this region of California. Quick-moving landslides are caused by very intense rain, or sometimes earthquakes, that make

5117-405: The Central Valley, which is the primary source for produce throughout the United States, including tomatoes, grapes, cotton, apricots, and asparagus. Six thousand almond growers produced more than 600 million pounds (270 × 10 ^  kg) in 2000, about 70 percent of the world's supply and nearly 100 percent of domestic production. The US' top four counties in agricultural sales are in

5236-579: The Garlock were thought to be in the years 1050 AD and 1500 AD. Research has pinned the interval between significant ruptures on the Garlock as being anywhere between 200 and 3,000 years, depending on the segment of the fault. The most recent notable event in the Garlock Fault Zone was a magnitude 5.7 near the town of Mojave on July 11, 1992. It is thought to have been triggered by the Landers earthquake , just two weeks earlier. However, no surface slippage of

5355-552: The Mississippi), Buena Vista Lake and Kern Lake . However, much of the Central Valley environment has been altered by human activity, including the introduction of exotic plants , notably grasses. The valley's grasslands, wetlands, and riparian forests constitute the California Central Valley grasslands , a temperate grasslands, savannas, and shrublands ecoregion . The foothill oak woodlands and chaparral that fringe

5474-769: The Pacific Ocean at San Francisco . The northern third of the western Sierra is part of the Sacramento River watershed (including the Feather , Yuba , and American River tributaries), and the middle third is drained by the San Joaquin River (including the Mokelumne , Stanislaus , Tuolumne , and Merced River tributaries). The southern third of the range is drained by the Kings , Kaweah , Tule , and Kern rivers, which flow into

5593-678: The Pacific. The waters of the Tulare Basin essentially never reach the ocean (with the exception of Kings River waters diverted northward for irrigation), though they are connected by man-made canals to the San Joaquin. The valley encompasses all or parts of 18 California counties: Butte , Colusa , Glenn , Fresno , Kern , Kings , Madera , Merced , Placer , San Joaquin , Sacramento , Shasta , Stanislaus , Sutter , Tehama , Tulare , Yolo and Yuba . Older names include "the Great Valley",

5712-695: The Park in 1906. In the same year, Sequoia National Park was formed to protect the Giant Sequoia: all logging of the Sequoia ceased at that time. In 1903, the city of San Francisco proposed building a hydroelectric dam to flood Hetch Hetchy Valley . The city and the Sierra Club argued over the dam for 10 years, until the U.S. Congress passed the Raker Act in 1913 and allowed dam building to proceed. O'Shaughnessy Dam

5831-568: The Sacramento River, 26 percent into the San Joaquin, and 27 percent into Tulare Lake. In the south part of the San Joaquin Valley, the alluvial fan of the Kings River and another from Coast Ranges streams have created a divide. The dry Tulare basin of the Central Valley receives flow from four major Sierra Nevada rivers, the Kings, Kaweah , Tule , and Kern . This basin, usually endorheic , formerly filled during snowmelt and spilled out into

5950-535: The Sacramento Valley for about 447 miles (719 km). In the San Joaquin Valley, the San Joaquin River flows roughly northwest for 365 miles (587 km), picking up tributaries such as the Merced River , Tuolumne River , Stanislaus River and Mokelumne River . The Central Valley watershed encompasses over a third of California at 60,000 square miles (160,000 km ), with 46 percent draining into

6069-576: The Sacramento Valley, with its high year-round flow and wide waterways, has been compared to the small and seasonal rivers of the San Joaquin basin; this also contributes to different identities between the two regions. Subregions and their counties commonly associated with the valley include: The four main population centers in the Central Valley area are roughly equidistant from the next. From south to north, they are Bakersfield , Fresno , Sacramento and Redding . These four cities act as hubs for regional commerce and transportation. The table displays

SECTION 50

#1732844394178

6188-480: The San Francisco Bay Area. Primary sources of population growth are Bay Area migrants seeking lower housing costs, augmented by immigration from Asia, Central America, Mexico, Ukraine, and the rest of the former Soviet Union. The Central Valley is one of the world's most productive agricultural regions. More than 230 crops are grown there. On less than 1 percent of the total farmland in the United States,

6307-615: The San Joaquin River. Called Tulare Lake , it is usually dry because the rivers feeding it have been diverted for agricultural purposes. Central Valley rivers converge in the Sacramento-San Joaquin Delta , a network of marshy channels, distributaries, and sloughs that wind around islands mainly used for agriculture. There the rivers merge with tidewater, and eventually reach the ocean after passing through Suisun Bay , San Pablo Bay , upper San Francisco Bay , and finally

6426-406: The San Joaquin's approximately 6 million acre-feet (7.4 km ). Intensive agricultural and municipal water consumption decreased the rate of outflow to about 17 million acre-feet (21 km ) for the Sacramento and 3 million acre-feet (3.7 km ) for the San Joaquin. These figures vary widely from year to year. Over 25 million people, living in the valley and other regions of

6545-468: The Sierra Nevada increases gradually from north to south. Between Fredonyer Pass and Lake Tahoe, the peaks range from 5,000 feet (1,500 m) to more than 9,000 feet (2,700 m). The crest near Lake Tahoe is roughly 9,000 feet (2,700 m) high, with several peaks approaching the height of Freel Peak (10,881 ft or 3,317 m). Farther south, the highest peak in Yosemite National Park

6664-552: The Sierra Nevada is influenced by the Mediterranean climate of California. During the fall, winter and spring, precipitation in the Sierra ranges from 20 to 80 in (510 to 2,030 mm) where it occurs mostly as snow above 6,000 ft (1,800 m). Precipitation is highest on the central and northern portions of the western slope between 5,000 and 8,000 feet (1,500 and 2,400 m) elevation, due to orographic lift . Above 8,000 feet (2,400 m), precipitation diminishes on

6783-499: The Sierra Nevada started in the early 1800s, when settlers relied on hand tools and ox-teams. Before the California Gold Rush, the industry was relatively small, and most of the lumber used in the state was imported. However, as the demand for lumber to support the mining industry increased, logging became a major industry in the region. Initially, most of the lumber produced in California was used in mining. The Comstock Lode

6902-431: The Sierra have an alpine climate . The Sierra Nevada snowpack is the major source of water and a significant source of electric power generation in California. Many reservoirs were constructed in the canyons of the Sierra throughout the 20th century, Several major aqueducts serving both agriculture and urban areas distribute Sierra water throughout the state. However, the Sierra casts a rain shadow , which greatly affects

7021-646: The Sierra is a section of the Cascade–Sierra Mountains province, which in turn is part of the larger Pacific Mountain System physiographic division. The California Geological Survey states that "the northern Sierra boundary is marked where bedrock disappears under the Cenozoic volcanic cover of the Cascade Range." The range is drained on its western slope by the Central Valley watershed, which discharges into

7140-493: The Sierra's 63,118 km (24,370 sq mi) from logging and grazing. The United States Forest Service and the Bureau of Land Management currently control 52% of the land in the Sierra Nevada. Logging and grazing are generally allowed on land controlled by these agencies, under federal regulations that balance recreation and development on the land. The California Bighorn Sheep Zoological Area near Mount Williamson in

7259-424: The Sierra. The combination of river and glacier erosion exposed the uppermost portions of the plutons emplaced millions of years before, leaving only a remnant of metamorphic rock on top of some Sierra peaks. Extension of the Basin and Range continues today, leading to downdropping of crustal blocks just east of the Sierra Nevada during large earthquakes, such as the Lone Pine earthquake of 1872. The climate of

SECTION 60

#1732844394178

7378-425: The Tuolumne and Merced River drainage. The group may have been the first non-indigenous people to see Yosemite Valley . The Walker Party probably visited either the Tuolumne or Merced Groves of giant sequoia , becoming the first non-indigenous people to see the giant trees, but journals relating to the Walker party were destroyed in 1839, in a print shop fire in Philadelphia. Starting in 1841, emigrants from

7497-444: The activities of extra-terrestrial aliens , have no evidence to support them. The Sierra Nevada is divided into a number of biotic zones , each of which is defined by its climate and supports a number of interdependent species. Life in the higher elevation zones adapted to colder weather, and to most of the precipitation falling as snow. The rain shadow of the Sierra causes the eastern slope to be warmer and drier: each life zone

7616-453: The addition of soil and fertilization can emit about 161,100 metric tons per year. Long term effects that nitrous oxide can have on a human being is loss of blood pressure, fainting, anemia, or lung cancer. The physical geographical attributes can also contribute to the air pollution quality. The Central Valley is surrounded by mountain ranges which can capture the pollution coming from the agricultural farming, preventing it from dispersing from

7735-399: The area around Yosemite National Park and what would become Kings Canyon National Park . James S. Hutchinson , a noted mountaineer, climbed the Palisades (1904) and Mount Humphreys (1905). By 1912, the USGS published a set of maps of the Sierra Nevada, and the era of exploration was over. Logging in the Sierra Nevada has significantly impacted the landscape. The logging industry in

7854-405: The climate and ecology of the central Great Basin . This rain shadow is largely responsible for Nevada being the driest state in the United States. Precipitation varies substantially from year to year. It is not uncommon for some years to receive precipitation totals far above or below normal. The height of the range and the steepness of the Sierra Escarpment, particularly at the southern end of

7973-428: The closest to it. The Garlock Fault is believed to have developed to accommodate the strain between the extensional tectonics of the Great Basin crust and the right lateral strike-slip faulting of the Mojave Desert crust. Unlike most of the other faults in California, slip on the Garlock Fault is left-lateral; that is, the land on the other side of the fault moves to the left from the perspective of someone facing

8092-579: The counties of Central Valley and their respective population during the 2020 US Decennial Census. Total jobs for each county is from the U.S. Census Bureau, OnTheMap Application and LEHD Origin-Destination Employment Statistics (Beginning of Quarter Employment, 2nd Quarter of 2002–2020). As of 2020, some 7.2 million people lived in the Central Valley; it was the fastest-growing region in California. It includes 12 Metropolitan Statistical Areas (MSA) and 1 Micropolitan Statistical Area (μSA). Below, they are listed by MSA and μSA population. The largest city

8211-412: The crest and north of 37.2°N. In the Triassic and into the Jurassic , an island arc collided with the west coast of North America and raised a chain of volcanoes, in an event called the Nevadan orogeny . Nearly all subaerial Sierran Arc volcanoes have since disappeared; their remains were redeposited during the Great Valley Sequence and the subsequent Cenozoic filling of the Great Valley, which

8330-440: The delta. Large blocks of desert scrubland exist in the southern San Joaquin Valley and the Carrizo Plain , just outside the valley, but offering a similar landscape. The wetlands have been the target of rescue operations to restore areas replaced by agriculture. These patches of natural habitat are disconnected, which is particularly damaging for wildlife that is used to migrating along the rivers. Agriculture, grazing land, and

8449-408: The draining of lakes and rivers have radically altered valley habitats. Most of the grassland has been overtaken by new species; most vernal pools have been destroyed, leaving only those on the higher slopes; the marshland has been drained, and the riverbank woodlands have nearly all been affected. The valley gives its name to Valley fever , which is primarily a disease of the lungs that is common in

8568-621: The drier San Joaquin Valley in the south, and the Tulare Basin and its semi-arid desert climate at the southernmost end. The Sacramento and San Joaquin river systems drain their respective valleys and meet to form the Sacramento–San Joaquin River Delta , a large expanse of interconnected canals , stream beds , sloughs , marshes and peat islands. The delta empties into the San Francisco Bay , and ultimately into

8687-407: The eastern edge of the southern Sierra. The Sierra Nevada has played an important role in the history of California and the United States. The California gold rush occurred in the western foothills from 1848 through 1855. Due to its inaccessibility, the range was not fully explored until 1912. Used in 1542 by Juan Rodríguez Cabrillo to describe a Pacific Coast Range ( Santa Cruz Mountains ),

8806-512: The endemic tule elk subspecies ( Cervus elaphus nannodes ), mule deer ( Odocoileus hemionus ), California ground squirrels , gophers , mice, hare, rabbits and kangaroo rats , along with their predators including the San Joaquin kit fox (an endangered subspecies surviving on the San Joaquin Valley's hillsides). The valley's wetlands were an important habitat for wintering waterbirds and migrating birds of other kinds. Reptiles and amphibians of

8925-584: The fault itself had been recorded in modern times until 2019. Following a series of earthquakes on nearby minor faults in late July 2019, the Garlock Fault was observed moving about 2 cm (0.8 in) between July and October accompanied by numerous minor earthquakes, a state known as fault creep , and producing a bulge in land observed by satellite radar images. Sierra Nevada The Sierra Nevada ( / s i ˌ ɛr ə n ɪ ˈ v æ d ə , - ˈ v ɑː d -/ see- ERR -ə nih- VA(H)D -ə )

9044-409: The fault. Thus, the terrain north of the fault is moving westward and that on the south is moving eastward. The Garlock Fault moves at a rate of between 2 and 11 mm a year, with an average slip of around 7 millimeters. While most of the fault is locked, certain segments have been shown to move by aseismic creep , which is motion without resulting earthquakes. The Garlock is not considered to be

9163-515: The first significant rainfall. The official season is from November 1 to March 31. This phenomenon is named after the valley's tule grass wetlands ( tulares ). Auto collisions caused by the tule fog are the leading cause of weather-related casualties in California. Two river systems drain and define the two parts of the Central Valley. The Sacramento River , along with its tributaries the Feather River and American River , flows southwards through

9282-483: The flat valley floor is Sutter Buttes , the remnants of an extinct volcano just to the northwest of Yuba City . Another significant geologic feature of the Central Valley lies hidden beneath the delta. The Stockton Arch is an upwarping of the crust beneath the valley sediments that extends southwest to northeast across the valley. The Central Valley lies within the California Trough physiographic section, which

9401-618: The future. A study published in October 2019 in the journal Science indicated that a part of the Garlock fault slipped after being triggered by the series of earthquakes in the Ridgecrest area which occurred in July 2019. Reports in the Los Angeles Times indicated that a magnitude 8 earthquake along the Garlock fault would have the potential for grave disaster. The last significant ruptures on

9520-406: The highest peak in the range. In 1873, Mount Whitney was climbed for the first time by 3 men from Lone Pine, California, on a fishing trip. From 1892 to 1897 Theodore Solomons made the first attempt to map a route along the crest of the Sierra. Other people finished exploring and mapping the Sierra. Bolton Coit Brown explored the Kings River watershed in 1895–1899. Joseph N. LeConte mapped

9639-511: The lake, the peaks reach only a modest 8,000 feet (2,400 m). There are several notable geographical features in the Sierra Nevada: Communities in the Sierra Nevada include Paradise , South Lake Tahoe , Truckee , Grass Valley , Lee Vining , Mammoth Lakes , Sonora , Nevada City , Placerville , Pollock Pines , Portola , Auburn , Colfax and Kennedy Meadows . Much of the Sierra Nevada consists of federal lands and

9758-771: The land to accommodate the consequences. Out of the past twenty-two years, California has experienced significant drought conditions for thirteen years. From 2000 to 2018 was the second driest period that California has ever experienced. The driest three-year period ever in California was from 2012 to 2014. Three-quarters of the state of California is experiencing extreme drought conditions. There are also multiple types of droughts such as agricultural droughts, meteorological droughts, snow droughts, and hydrological droughts. All of these droughts affect California in different ways. Droughts can damage forests and can cause wildfires. Droughts cause forests to become dry which causes trees to die. Dead trees result in wildfires. The U.S. drought monitor

9877-676: The largest tree in the world by volume; Lake Tahoe , the largest alpine lake in North America; Mount Whitney at 14,505 ft (4,421 m), the highest point in the contiguous United States ; and Yosemite Valley sculpted by glaciers from one-hundred-million-year-old granite , containing high waterfalls . The Sierra is home to three national parks , twenty-six wilderness areas, ten national forests, and two national monuments. These areas include Yosemite , Sequoia , and Kings Canyon National Parks , as well as Devils Postpile National Monument . More than one hundred million years ago during

9996-487: The late 1800s due to several factors. The Timber and Stone Act of 1878 allowed individuals to claim ownership of old-growth timber tracts, which were later consolidated under joint-stock companies , such as those founded by Midwestern lumber magnates. These companies had the financial resources to transport timber from remote locations and build sawmills near the tracks of the Southern Pacific railroad which connected

10115-455: The late 1800s, the logging industry moved westward due to the depletion of white pine forests in the upper Midwest. This shift was encouraged by the positive portrayal of the Sierra Nevada as a promising timber region. In 1859, Horace Greely marveled, "I never saw anything so much like good timber in the course of any seventy-five miles' travel as I saw in crossing the Sierra Nevada." The logging industry experienced significant growth in

10234-487: The miners, provoking counter-attacks on native villages. The Native Americans, out-gunned, were often slaughtered. The Gold Rush populated the western foothills of the Sierra Nevada, but even by 1860, most of the Sierra was unexplored. The state legislature authorized the California Geological Survey to officially explore the Sierra (and survey the rest of the state). Josiah Whitney was appointed to head

10353-488: The modern rivers flowing down the range are only 100–300 meters (300–1,000 ft) lower than their ancient counterparts from 30–40 million years ago and the overall elevation and bedrock topography of the northern Sierra Nevada has changed little since at least 30–40 million years ago. About 2.5 Ma, the Earth's climate cooled, and ice ages started. Glaciers carved out characteristic U-shaped canyons throughout

10472-688: The mountains were amongst a group led by fur trapper Jedediah Smith , crossing north of the Yosemite area in May 1827, at Ebbetts Pass . In 1833, a subgroup of the Bonneville Expedition led by Joseph Reddeford Walker was sent westward to find an overland route to California . Eventually the party discovered a route along the Humboldt River across present-day Nevada , ascending the Sierra Nevada, starting near present-day Bridgeport and descending between

10591-409: The mountains. Washo and Maidu were also in this area prior to the era of European exploration and displacement. American exploration of the mountain range started in 1827. Although prior to the 1820s there were Spanish missions , pueblos (towns), presidios (forts), and ranchos along the coast of California, no Spanish explorers visited the Sierra Nevada. The first Americans to visit

10710-399: The northern Sierran valleys with volcanic deposits. These pyroclastic flows, which continued for about 10 million years, were followed by andesitic lahars which nearly completely buried the northern Sierran landscape such that only the tallest peaks emerged above a volcanic plain. This second period of volcanism appears to have been triggered by crustal extension associated with extension of

10829-666: The oldest being metasedimentary rocks from the Cambrian in the Mount Morrison region. These dark-colored hornfels , slates , marbles , and schists are found in the western foothills (notably around Coarsegold , west of the Tehachapi Pass ) and east of the Sierra Crest. The earliest granite of the Sierra started to form in the Triassic period. This granite is mostly found east of

10948-497: The other areas in California. The Central Valley is also expanding in the number of people that coincide in that area, so it increases the number of cars which can also contribute to the amount of emission that is in the air. The northern Central Valley has a hot Mediterranean climate ( Köppen climate classification Csa ); the more southerly parts in rainshadow zones are dry enough to be Mediterranean steppe or even low-latitude desert ( BWh , as in areas around Bakersfield ). It

11067-512: The plural ( Smokies , Rockies , Cascades , etc.), since Sierra is already pluralized in its native language, some locals who live in "the Sierra" are not hesitant to admonish those who refer to the area as "the Sierras". However, there are historical and literary references that use the plural, such as the 1871 collection of Joaquin Miller poems, Songs of the Sierras . Ansel Adams , in response to

11186-420: The range, produces a wind phenomenon known as the "Sierra Rotor". This is a horizontal rotation of the atmosphere just east of the crest of the Sierra, set in motion as an effect of strong westerly winds. Because of the large number of airplanes that have crashed in the Sierra Nevada, primarily due to the complex weather and atmospheric conditions such as downdrafts and microbursts caused by geography there,

11305-517: The risk of floods damaging properties increased greatly. The Great Flood of 1862 was the valley's worst flood in recorded history, flooding most of the valley and putting some places as much as 20 feet (6.1 m) under water. In 2003, it was determined that Sacramento had both the least protection against and nearly the highest risk of flooding. Congress then granted a $ 220 million loan for upgrades in Sacramento County. Other counties in

11424-631: The rivers, with many of them being part of the Central Valley Project . These dams impact physical, economic, cultural, and ecological resources: for example, enabling the development of its vast agricultural resources but leading to the loss of the Chinook salmon . Post-World War II demand for urban development, most notably the San Francisco Bay Area and the Los Angeles / Inland Empire / San Diego , required water resources. Moreover, agriculture in

11543-554: The scars of hydraulic mining, since the resulting exposed earth and downstream gravel deposits do not support plant life. It is estimated that by 1855, at least 300,000 gold-seekers, merchants, and other immigrants had arrived in California from around the world. The huge numbers of newcomers brought by the Gold Rush drove Native Americans out of their traditional hunting, fishing and food-gathering areas. To protect their homes and livelihood, some Native Americans responded by attacking

11662-585: The southern Central Valley required far more water than was available locally. The Feather River in the Sacramento Valley was looked to as a water source, leading to the California State Water Project . This transports water to the southern San Joaquin Valley and urban areas south of the Tehachapi Mountains. Runoff from the Sacramento and San Joaquin Rivers is intercepted in the delta through

11781-454: The southern Sierra was established to protect the endangered Sierra Nevada bighorn sheep . Starting in 1981, hikers were unable to enter the Area from May 15 through December 15, in order to protect the sheep. As of 2010, the restriction has been lifted and access to the Area is open for the whole year. The earliest rocks in the Sierra Nevada are metamorphic roof pendants of Paleozoic age,

11900-456: The southern half of the San Joaquin Valley but occasionally to the Sacramento Valley . The northern half of the Central Valley receives greater precipitation than the semidesert southern half. Frost occurs at times in the fall months, but snow is extremely rare. Tule fog / ˈ t uː l iː / is a thick ground fog that settles along the valley's length. Tule fog forms during the late fall and winter (California's rainy season ), after

12019-400: The southwestern United States and northwestern Mexico. It is caused by the fungus Coccidioides immitis , which grows in soils in areas of low rainfall, high summer temperatures, and moderate winter temperatures. These fungal spores become airborne when the soil is disturbed by winds, construction, or farming. This illness frequently takes weeks or months to resolve. Occasionally Valley Fever

12138-408: The state capital Sacramento , as well as Redding , Chico , Stockton , Modesto , Merced , Fresno , Visalia , Porterville , and Bakersfield . The Central Valley watershed comprises 60,000 square miles (160,000 km ), or over a third of California. It consists of three main drainage systems: the Sacramento Valley in the north, which receives over 20 inches (510 mm) of rain annually;

12257-523: The state, rely on the water carried by these rivers. Sierra Nevada runoff provides one of California's largest water resources. The Sacramento River is the second largest river to empty into the Pacific from the contiguous United States , behind only the Columbia River and greater than the Colorado River . Combined with the fertile and expansive area of the Central Valley's floor, the Central Valley

12376-425: The survey. Men of the survey, including William H. Brewer , Charles F. Hoffmann and Clarence King , explored the backcountry of what would become Yosemite National Park in 1863. In 1864, they explored the area around Kings Canyon . In 1869, John Muir started his wanderings in the Sierra Nevada range, and in 1871, King was the first to climb Mount Langley , mistakenly believing he had summited Mount Whitney ,

12495-490: The term "Sierra Nevada" was a general identification of less familiar ranges toward the interior. In 1776, Pedro Font 's map applied the name to the range currently known as the Sierra Nevada. The literal translation is "snowy mountains", from sierra "a range of mountains", 1610s, from Spanish sierra "jagged mountain range", lit. "saw", from Latin serra "a saw"; and from fem. of Spanish nevado "snowy". While many mountain ranges are unanimously referred to in

12614-490: The valley have been categorized as the California interior chaparral and woodlands ecoregion. The dominant grass of the valley was Nassella pulchra mixed with other species, but today only 1% of the grassland in the valley is intact. Grassland flowers include California poppy ( Eschscholzia californica ), lupins , and purple owl's clover ( Castilleja exserta ), which can still be seen, especially in Antelope Valley in

12733-563: The valley include the endemic San Joaquin coachwhip snake ( Masticophis flagellum ruddocki ), blunt-nosed leopard lizard ( Gambelia sila ), Gilbert's skink ( Eumeces gilberti ) and the western aquatic garter snake ( Thamnophis couchii ). Endemic invertebrates are present. The Central Valley is home to endemic fish species, including the Sacramento pikeminnow , Sacramento perch , Sacramento blackfish , and Sacramento splittail . The Great Valley Grasslands State Park preserves an example of

12852-484: The valley that often face flooding are Yuba , Stanislaus , and San Joaquin . There is a very strong positive correlation between rainfall and slow-moving landslides in Northern California, especially in the Central Valley region. Changes in climate and precipitation levels have shown that consistent average rainfall has increased the number and intensity of landslides within the past 5–6 years. This information

12971-589: The valley's native grass habitat , while oak savanna habitats survive near Visalia . Areas of wetland and riverside woodland are found in the north, especially by the Sacramento River system, including the Nature Conservancy 's Cosumnes River Preserve just south of Sacramento, Gray Lodge Wildlife Area, Butte Sink Wildlife Management Area , and other patches in the delta area. Remaining vernal pools include Pixley National Wildlife Refuge between Tulare, California , and Bakersfield and Jepson Prairie Preserve in

13090-424: The water from an entire river into a sluice alongside the river, and then dig for gold in the newly exposed river bottom. By 1853, most of the easily accessible gold had been collected, and attention turned to extracting gold from more difficult locations. Hydraulic mining was used on ancient gold-bearing gravel beds on hillsides and bluffs in the gold fields. In hydraulic mining, a high-pressure hose directed

13209-523: The western half of the Sierra, while the later plutons formed in the eastern half of the Sierra. At this time, the Sierra Nevada formed the western ramp of a high plateau to the east, the Nevadaplano . During this period, rivers cut deep canyons into the range, generating topographic relief similar to the modern Sierra Nevada. This period of incision was halted approximately 30 million years ago by vast outpourings of pyroclastic flows from Nevada which filled

13328-500: The western side, and the Kawaiisu and Tübatulabal tribes in the southern Sierra. Today, some historic intertribal trade route trails over mountain passes are known artifact locations, such as Duck Pass with its obsidian arrowheads . The California and Sierra Native American tribes were predominantly peaceful, with occasional territorial disputes between the Paiute and Sierra Miwok tribes in

13447-501: The western slope up to the crest, since most of the precipitation has been wrung out at lower elevations. Most parts of the range east of the crest are in a rain shadow , and receive less than 25 inches of precipitation per year. While most summer days are dry, afternoon thunderstorms are common, particularly during the North American Monsoon in mid and late summer. Some of these summer thunderstorms drop over an inch of rain in

13566-403: The “Central Valley”, many residents consider the Central Valley to consist of only the San Joaquin Valley . This is perhaps due to significant landscape and cultural differences between the two; the San Joaquin Valley is poorer and drier with more fertile soil, while the Sacramento Valley is wealthier and wetter with poorer soils. The major presence of the Sacramento River and its tributaries in

13685-463: Was a major center for logging, with operations supplying lumber for the construction of mine structures, such as tunnels, shafts, and buildings, as well as fuel for the mines. Dan DeQuille observed in 1876, "the Comstock Lode may truthfully be said to be the tomb of the forests of the Sierra. Millions upon millions of feet of lumber are annually buried in the mines, nevermore to be resurrected.” In

13804-529: Was completed in 1923. Central Valley (California) The Central Valley is a broad, elongated, flat valley that dominates the interior of California . It is 40–60 mi (60–100 km) wide and runs approximately 450 mi (720 km) from north-northwest to south-southeast, inland from and parallel to the Pacific coast of the state . It covers approximately 18,000 sq mi (47,000 km ), about 11% of California's land area. The valley

13923-421: Was discovered, hundreds of miners would collaborate to put up a camp and stake their claims. Because the gold in the California gravel beds was so richly concentrated, the early forty-niners simply panned for gold in California's rivers and streams. However, panning cannot take place on a large scale, and miners and groups of miners graduated to more complex placer mining. Groups of prospectors would divert

14042-440: Was first protected by the federal government in 1864. The Valley and Mariposa Grove were ceded to California in 1866 and turned into a state park. John Muir perceived overgrazing by sheep and logging of giant sequoia to be a problem in the Sierra. Muir successfully lobbied for the protection of the rest of Yosemite National Park: Congress created an Act to protect the park in 1890. The Valley and Mariposa Grove were added to

14161-456: Was shown in a study that focused on the behavior of these slow-moving landslides and how their nature changed with years of extreme average rainfall versus minimal average rainfall. In 2016, the average annual precipitation levels were lower because of a drought that was coming to an end at that time. The minimal rainfall in that year showed that 119 landslides had been moving. Comparatively, in 2017, there were very extreme levels of precipitation in

#177822