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San Jacinto Fault Zone

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The San Jacinto Fault Zone ( SJFZ ) is a major strike-slip fault zone that runs through San Bernardino , Riverside , San Diego , and Imperial Counties in Southern California . The SJFZ is a component of the larger San Andreas transform system and is considered to be the most seismically active fault zone in the area. Together they relieve the majority of the stress between the Pacific and North American tectonic plates.

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93-492: The SJFZ itself consists of many individual fault segments, some of which have only been individualized as recently as the 1980s, but activity along the line of faults has been documented since the 1890s. One segment of the SJFZ, the Anza seismic gap, has not experienced any major activity since instrumental records have been kept. Each segment was evaluated for its seismic risk and was assigned

186-579: A Caltech seismologist, stated that the earthquake was centered near Ocotillo Wells about 120 mi (190 km) southeast of Los Angeles. The mainshock occurred at 6:28 pm and aftershocks continued through the evening, but were tapering off by 10 pm. ( 33°12′N 116°06′W  /  33.2°N 116.1°W  / 33.2; -116.1 ) Two earthquakes in late November caused property damage totaling three million in Imperial County . The two events were separated by eleven hours and were located in

279-453: A brick building. It could produce 50 barrels of flour per day. Hemet was incorporated in January 1910. Of 177 residents, 130 voted to incorporate, with 33 against. Those who voted against incorporation were landowners who feared increased taxation. The incorporation helped to serve the growing city, which was outgrowing its current infrastructure. With a railroad spur running from Riverside ,

372-985: A filming location for the movie Seabiscuit (2003). The movie Hemet, or the Landlady Don't Drink Tea (2023) was filmed in San Diego County , but the location setting is in Hemet. In addition to Diamond Valley Lake , Hemet has six large parks as part of the Valley-Wide Recreation and Parks District, which also includes the cities of San Jacinto and Menifee as well as a number of unincorporated areas. Brubaker park contains one large children's play area, one half basketball court, eleven baseball/softball fields, fitness trails, two picnic areas, and one portable restroom. The Diamond Valley Lake Community Park opened in September 2009. The 85-acre (34 ha) park, part of

465-470: A half basketball court, picnic tables, shade structures, restrooms and a large turf area. There is a marked walking path/sidewalk of 0.75 miles (1.2 km) around the perimeter of the park. It has an area of 16 acres (65,000 m ), and was established in 1993. A fitness court was opened in October 2022. Dedicated to James Simpson, Hemet City Council from 1947 to 48, and mayor from 1950 to 1966, Simpson Park

558-536: A joint rupture of both the SAF and the San Jacinto Fault Zone to the southeast more closely match the damage pattern recorded about this event. On December 25, with a maximum intensity of MM IX, this magnitude 6.6 earthquake destroyed San Jacinto and Hemet and six were killed by adobe walls that collapsed at Soboba (just east of San Jacinto). A 46 m (151 ft) fissure, which may have been surface rupture of

651-478: A large turf area for passive uses. The park also features a memorial of military branches of the United States. In October 2023, a skate park was opened. In 2024, pickleball courts were added. It has an area of 11 acres (45,000 m ), and was established in 1970. Dedicated to Mary Henley, who was born in Hemet and served as Hemet City Clerk from October 1951 to March 1975. The park contains two playground areas,

744-666: A magnitude 6.4 M L earthquake with a maximum perceived intensity of MM VII hit the extreme eastern San Diego County area and created a 31 km (19 mi) surface break along the Coyote Creek Fault. California State Route 78 was damaged with cracks near Ocotillo Wells and large boulders blocked the Montezuma-Borrego Springs Highway. Other rockslides occurred at Palm Canyon and Split Mountain in Anza-Borrego Desert State Park . One house

837-512: A population of 78,657. The population density was 2,824.6 inhabitants per square mile (1,090.6/km ). The racial makeup of Hemet was 53,259 (67.7%) White (51.8% Non-Hispanic White), 5,049 (6.4%) African American , 1,223 (1.6%) Native American , 2,352 (3.0%) Asian , 284 (0.4%) Pacific Islander , 12,371 (15.7%) from other races , and 4,119 (5.2%) from two or more races. There were 28,150 residents of Hispanic or Latino origin, of any race (35.8%). The census reported that 78,043 people (99.2% of

930-448: A probability for the occurrence of a large rupture for the thirty-year period starting in 1995. While several of the large earthquakes along the SJFZ have not resulted in significant property damage or loss of life (due to their remote location) the cities of Hemet and San Jacinto were both heavily damaged in two significant events in 1899 and 1918 . The recurrence interval for a series of large earthquakes starting in 1899 (including

1023-634: A repeat event in modern times would result in heavy property damage and loss of life. A 1995 report by the Working Group on California Earthquake Probabilities identified seven individual segments of the SJFZ. The group consisted of more than three dozen seismologists, including Keiiti Aki and C. Allin Cornell , and was organized by the Southern California Earthquake Center for the USGS and

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1116-485: A student population of over 20,000 students. There are also HUSD member schools in the rural communities of Anza , Idyllwild and Winchester . As of January 2010, the school district was facing having to possibly go far out of budget to fix the Historic Hemet Elementary school, due to the fact that it was built on top of a swamp and has been sinking deeper every year. The main building was built in 1927, and

1209-517: A third main track in the summer of 2008. The railroads share track rights through the pass ever since the Union Pacific gained track rights on the Santa Fe portion negotiated under the original Los Angeles and Salt Lake Railroad . The original BNSF (ATSF) line was built in the 1880s and later roads, U.S. Route 66 and I-15, roughly followed this route. The 3.0% grade for a few miles on the south track

1302-463: A uniform pattern became apparent. Moving southeastward from the Cajon Pass, the large SJFZ events appear on a line with a slope of 1.7 km per year and Sanders hypothesized that the 1857 earthquake introduced a strain pulse that migrated southeast and triggered large earthquakes as it traversed the SJFZ at that rate. Uncertainty surrounds the details of this earthquake but recent studies suggest that

1395-407: A window. Activities were suspended there for several days due to the damage. The Southern California Irrigation District estimated damage to be $ 600,000 – $ 750,000. The initial shock produced a small amount of deformation in the canal's liner while the second main shock caused considerable damage to thousands of feet of canal lining in the northwest section of the valley. Several foreshocks preceded

1488-852: Is a mountain pass between the San Bernardino Mountains to the east and the San Gabriel Mountains to the west in Southern California . Created by the movements of the San Andreas Fault , it has an elevation of 3,777 ft (1,151 m). Located in the Mojave Desert , the pass is an important link from the Greater San Bernardino Area to the Victor Valley , and northeast to Las Vegas . The Cajon Pass area

1581-541: Is a city in the San Jacinto Valley in Riverside County, California . It covers a total area of 29.3 square miles (76 km ), about half of the valley, which it shares with the neighboring city of San Jacinto . The population was 89,833 at the 2020 census . It borders San Jacinto to the north, East Hemet to the east, Polly Butte and Diamond Valley Lake to the south, and Green Acres and Juniper Springs to

1674-529: Is a museum of local history, and features photographs of old Hemet, historic photographs from the Ramona Pageant, as well as Cahuilla cultural belongings such as baskets and agriculture displays. Hemet is also home of the Western Science Center , located in the southern part of the city at the intersection of Domenigoni Parkway and Searl Parkway. It features exhibits of Ice Age mammals, including 'Max',

1767-480: Is a short, well-preserved fragment dating to a rerouting and widening of the highway in the early 1950s. Only the southbound/westbound lanes are in use; the northbound/eastbound lanes and corresponding bridges are closed to through traffic. It is along this stretch of road, accessible via either the Kenwood Avenue or Cleghorn Road exits that some of the best trainspotting areas are found. The Cajon Pass segment of I-15

1860-543: Is a wilderness park located in the Santa Rosa Hills southeast of Hemet with sheltered picnic area and tables, barbecues, restrooms, and hiking trails. At an elevation of 2,500 feet (760 m), it provides an expansive view of the San Jacinto Valley, as well as the nearby cities and towns of Winchester, Menifee, and Temecula , and it has an area of 438 acres (1.8 km ). Weston Park was established in 1921 and

1953-524: Is based on the surface rupture of the 1968 Borrego Mountain earthquake and shares a recurrence interval of 175 years. The 1988 Working Group defined the segment as two parallel strands, the Superstition Hills and Superstition Mountain faults, though no slip rate or recurrence interval was known. On November 23, 1987, the Working Group determined that the available information was still not adequate to assign 30-year probabilities. On November 24, 1987,

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2046-445: Is challenging for long trains, making the westbound descent dangerous, as a runaway can occur if the engineer is not careful in handling the brakes. The second track, built in 1913, is 2 miles (3.2 km) longer to get a lower 2.2% grade. It ran through two short tunnels, but both were removed when the third main track was added next to the 1913 line. Trains may be seen traveling at speeds of 60 and 70 mph (97 and 113 km/h) on

2139-461: Is notorious for high winds, particularly during Santa Ana wind season, with gusts of wind up to 60 miles per hour (97 km/h). It has been known to cause high-profile vehicles such as semi-trucks to lose control or tip over. During wind advisories, Caltrans will use its Changeable message signs to warn motorists of dangerous weather in the Cajon Pass. Cajon Pass gets snow occasionally, usually not enough to cause closures. When any closure

2232-473: Is on the Pacific Crest Trail . Cajon Pass is at the head of Horsethief Canyon , traversed by California State Route 138 (SR 138) and railroad tracks owned by BNSF Railway and Union Pacific Railroad . Improvements in 1972 reduced the railroad's maximum elevation from about 3,829 to 3,777 feet (1,167 to 1,151 m) while reducing curvature. Interstate 15 does not traverse Cajon Pass, but rather

2325-423: Is one of the few historic landmarks left in Hemet. The other choice would be to demolish the school and build a new one in its place. The State of California will pay for 50% of either project, but the already cash-strapped district may run into trouble if the repairing of the school goes over budget. A new building could cost $ 20 million, with an extra $ 3 million to have it built in the original architectural style of

2418-525: Is separated from the Casa Loma by a small compressional step in the city of Hemet , continues southeastward out of the valley. This area was heavily damaged by the historic earthquakes of 1899 and 1918. The 1899 event is thought to have occurred within the valley, likely on the Casa Loma strand, while the 1918 event has been identified on the Clark strand between Hemet and Anza . While the 1988 Working Group included

2511-438: Is thus sometimes identified as Cajon Summit. However, the entire area, including Cajon Summit, is often called Cajon Pass. The Pacific Crest Trail goes through the Cajon Pass area, and during the hiking season up to several thousand transient hikers will pass through this area after walking one of the hottest, driest, and most grueling sections of desert on the trail. A nearby McDonald's restaurant happens to be very close to

2604-521: Is total, California Highway Patrols often provide escorts through the pass as the Interstate 15 is a major artery for the High Desert region. When there is high wind or snow in the Cajon Pass, it is fairly common for weather forecasters or reporters from Los Angeles television stations to do location reports from the Cajon Pass. The San Andreas Fault passes through the Cajon Pass (crossing I-15 on

2697-521: Is typically from the west, although in Santa Ana and other weather conditions it may be out of the north or the southeast. Air spilling over the San Gabriels can cause violent up- and downdrafts. On a normal day, with the wind out of the west, turbulence usually starts a few miles west of Rialto and continues a few miles to the east, growing in strength above the altitude of the mountains and especially over

2790-825: The 1979 Imperial Valley earthquake . To the northeast are several cross faults that trend northeast. One of these faults ruptured during a large aftershock of the 1979 event and another slipped as the smaller of the two shocks during the November 1987 sequence. The first shock (on what became known as the Elmore Ranch fault) measured 6.2 M s and the shock 11.4 hours later on the SHF measured 6.6 M s . ( 33°06′N 115°48′W  /  33.1°N 115.8°W  / 33.1; -115.8 & 33°00′N 115°48′W  /  33.0°N 115.8°W  / 33.0; -115.8 ) Notes Sources Hemet, California Hemet

2883-577: The 2006 Mercy Air 2 accident , an air ambulance helicopter collided with mountainous terrain near the pass in foggy weather. The California Southern Railroad , a subsidiary of the Atchison, Topeka and Santa Fe Railway , was the first railroad through Cajon Pass. The line through the pass was built in the early 1880s to connect the present day cities of Barstow and San Diego . Today the Union Pacific Railroad and BNSF Railway (the successor to

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2976-764: The Blue Cut Fire again forced the closure of the freeway for several days starting on August 16, 2016. The fire closed the I-15 north and southbound lanes due to the intensity of the fire. It destroyed a number of outbuildings and homes, and destroyed the Summit Inn Restaurant in Oak Hills. A McDonald's restaurant was also burned but the damage was minor. The fire threatened homes in Lytle Creek, Phelan, Oak Hills and Wrightwood and burned 37,000 acres (15,000 ha) Cajon Pass

3069-622: The Brightline West high-speed rail line is currently under construction in Cajon Pass as part of its route between Rancho Cucamonga and Las Vegas. The route will follow the existing I-15 right-of-way. The Mojave Freeway (I-15) was built in 1969 over Cajon Summit west of Cajon Pass. It is a major route from Los Angeles and the Inland Empire to Las Vegas. The freeway runs above and parallel to an original stretch of historic Route 66 and U.S. Route 395 . This stretch, now known as Cajon Boulevard,

3162-638: The California Office of Emergency Services . The 1995 paper was the third in a series of reports that was set in motion following the 1992 Landers earthquake in southern California with the intention of updating the data and the approach for calculating the probabilities for large earthquakes along the southern San Andreas and San Jacinto Fault zones. Both these fault zones were grouped together as having adequate paleoseismic data to assign conditional probabilities for future damaging earthquakes. The original Working Group in 1988 had identified five segments of

3255-542: The Four Corners region, and hydroelectric dams along the Colorado River . During October and November 2003, a number of wildfires devastated the hills and mountainsides near and around the pass, forcing the closure of Interstate 15. The following winter, rains in addition to burnt vegetation caused a number of landslides to further close the freeway pass. On July 17, 2015, during severe drought conditions plaguing

3348-701: The Lake Hemet Water Company, and the Lake Hemet Land Company, for speculative development. They had plans to dam the San Jacinto River to provide irrigation water to the valley. They named the town Hemet in November 1893. In 1895, they completed Hemet Dam as a private project on the San Jacinto River , creating Lake Hemet and providing a reliable water supply to the San Jacinto Valley. This water system, for irrigation in an arid region,

3441-440: The right-lateral strike-slip SJFZ is southern California's most restless fault, with the exception of several sections which have seen less frequent activity. In a 1975 study, one of these (a 40 km (25 mi) stretch) was labeled the "Anza to Coyote Mountain slip gap", and was further refined in a 1984 paper by seismologists Christopher Sanders and Hiroo Kanamori to include only a smaller 20 km (12 mi) section near

3534-403: The 1960s, large-scale residential development began, mostly in the form of mobile home parks and retirement communities. Hemet was known as a working-class retirement area. In the 1980s, former ranchland was developed in subdivisions of single-family homes. "Big-box" retail followed the increase in population. After a roughly decade-long lull in development following the major economic downturn of

3627-526: The 1987 Superstition Hills and Elmore Ranch events. The 1857 rupture spanned a total of 360 kilometers (220 mi) and terminated on the southeast end near the point where the San Jacinto Fault Zone branches away from the San Andreas Fault Zone at the Cajon Pass . In a paper published in the journal Science , Christopher Sanders plotted the earthquakes of the SJFZ by time and location and found that

3720-517: The 5.9 1937 Terwilliger Valley earthquake) was 18, 5, 14, 5, 12, 14, and 19 years, yet there has not been a strong earthquake for 37 years (since the 1987 Superstition Hills and Elmore Ranch sequence ). The San Jacinto Fault Zone and the San Andreas Fault (SAF) accommodate up to 80% of the slip rate between the North American and Pacific plates . The extreme southern portion of the SAF has experienced two moderate events in historical times, while

3813-625: The Borrego Mountain segment received a more specific value of 6%. The northernmost primary strand of the SJFZ is the Claremont strand (though subsidiary parallel strands exist). It spans a total of 75 km (47 mi), from its northern endpoint in Cajon Pass to its southern endpoint in the San Jacinto Valley . Within the San Bernardino Valley itself, the SJFZ approaches or intersects the right-lateral strike-slip San Andreas Fault to

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3906-543: The Clark, Coyote Creek, and Buck Ridge faults, the 1995 Working Group limited the segment to just the 90 km (56 mi) Clark fault. A paleoseismic investigation on this segment at Hog Lake indicated three historical surface-rupturing events occurred around 1210, 1530, and 1750 with an average recurrence period for a magnitude 7.0–7.5 earthquake of 250 years. With a recurrence period of 175 (+158 / -95) years, no surface-rupturing event has occurred on this 40 km (25 mi) segment since 1892. The extent of this segment

3999-769: The Historic Hemet Theater Foundation negotiated a five-year lease/option to purchase the theater. As of 2016, the Foundation had restored the Theater back to operation and was in the process of raising funds in order to purchase and restore the Hemet Historical Treasure. Scenes for The Fast and the Furious (2001) were filmed on Domenigoni Parkway. The grandstands and track at the Hemet Stock Farm were

4092-576: The Ramona Bowl, an outdoor amphitheater, a Regal Cinemas and the Historic Hemet Theatre, built in 1921. A development being planned for the area is a downtown transit village , with the center of it being a Metrolink station. It will be north of the downtown core, and will consist of residences, shops, and parks. The station itself could feature a railroad museum, a heritage trail, and a farmer's market and market hall. The Historic Hemet Theater

4185-475: The SJFZ is one of California's most active fault zones and has repeatedly produced both moderate and large events. The locations of earthquakes before the 1954 Arroyo Salada earthquake are not precisely known, but the events' effects place them on the SJFZ and not on the SAF. The 1923 North San Jacinto Fault earthquake struck the Inland Empire area of southern California at a time of relatively low population, and

4278-488: The SJFZ. However, if the slip were to extend out of the Anza area, the earthquake could be up to, but not larger than 7.0 in magnitude. At least six large ruptures of the San Jacinto Fault Zone are known to have followed the 1857 Fort Tejon earthquake that ruptured the central segment of the San Andreas Fault. These events began with the 1899 San Jacinto earthquake and occurred at intermittent intervals culminating with

4371-524: The San Jacinto Fault, ran under a house that was severely damaged near Hemet. The effects of the early morning earthquake were severe. Not all the buildings in San Jacinto were completely destroyed by the thirty seconds of shaking, but most of the brick buildings' second floors were heavily damaged. ( 33°48′N 117°00′W  /  33.8°N 117.0°W  / 33.8; -117.0 ) On April 9,

4464-569: The Santa Fe) use the pass to reach Los Angeles and San Bernardino as part of the Southern Transcon . Due to the many trains, scenery and easy access, it is a popular location for railfans , and many photographs of trains on Cajon Pass appear in books and magazines. The Union Pacific Railroad owns one track through the pass, on the previous Southern Pacific Railroad Palmdale cutoff, opened in 1967. The BNSF Railway owns two tracks and began to operate

4557-619: The Santa Rosa Hills and San Jacinto Mountains, is mostly dry land, except for Diamond Valley Lake to the south. According to the United States Census Bureau , the city has a total area of 29.28 square miles (76 km ), all land. Hemet is 80 miles (130 km) southeast of Downtown Los Angeles . Hemet has a semi-arid climate ( Köppen climate classification : BSh ) with mild winters and very hot, very dry summers. The 2010 United States Census reported that Hemet had

4650-406: The age of 18 living with them, 43.6% were married couples living together, 13.5% had a female householder with no husband present, and 38.5% were non-families. 33.4% of all households were made up of individuals, and 21.7% had someone living alone who was 65 years of age or older. The average household size was 2.5 and the average family size was 3.2. In the city, 29.1% of the population was under

4743-419: The age of 19, 6.2% was from 20 to 24, 11.9% from 25 to 34, 10.6% from 35 to 44, 17.2% from 45 to 54, and 25.7% was 65 or older. The median age was 38 years. The median income for a household in the city was $ 34,974, and the median income for a family was $ 41,559. Males had a median income of $ 40,719 versus $ 30,816 for females. The per capita income for the city was $ 19,046. About 14.5% of families and 17.2% of

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4836-667: The cities of Imperial Valley . Power failures along with disruption to telephone service caused problems in the Hemet Valley area, and smaller power outages in Los Angeles and Orange Counties also occurred. A brick wall collapsed at a laundromat in Westmorland (in the El Centro Metropolitan Area ) but no one was injured, and in the seaside neighborhoods of San Diego county several hundred windows were broken. Charles Richter ,

4929-612: The city became a trading center for San Jacinto Valley agriculture; commodity crops included citrus, apricots, peaches, olives, and walnuts. The Agricultural District Farmer's Fair of Riverside County began here in 1936 as the Hemet Turkey Show. It was relocated to Perris . During World War II , the city hosted the Ryan School of Aeronautics, which trained about 6,000 fliers for the Army Air Force between 1940 and 1944. The site of

5022-422: The city include leisure and hospitality, financial services, professional and business services, construction, and manufacturing. The amount of wage and salary positions in Hemet is 22,769, with a further 1,479 people being self-employed, adding up to a total of 24,248 jobs in the city. Hemet was heavily impacted by the housing crisis which followed the financial crisis of 2007–2008 . Rent remains affordable, but

5115-568: The city. The population density was 2,713.4 inhabitants per square mile (1,047.6/km ). There were 33,486 housing units at an average density of 1,208.8 units per square mile (466.7 units/km ). As of 2009 , The racial makeup of the city was 60% white , 2.4% black or African American , 4.9% Asian or Pacific Islander , 4.9% from other races and 28.2% of the population were Hispanic or Latino . 12.6% were of German , 10.5% English , 7.8% Irish and 4.3% American ancestry . There were 29,341 households, out of which 31.1% had children under

5208-453: The early 1990s, housing starts in the city skyrocketed in the early 21st century. The area's affordability, its proximity to employment centers such as Corona, Riverside and San Bernardino , and its relatively rural character made it an attractive location for working-class families priced out of other areas of Southern California. Hemet is in the San Jacinto Valley of western Riverside County , south of San Jacinto . The valley, surrounded by

5301-503: The early 19th century, Mission San Luis Rey used the land for cattle ranching. They named the area with the settler name Rancho San Jacinto . Hemet was named by the land development company that founded the town, The Lake Hemet Land Company . The company drew its name from Hemet Valley, now called Garner Valley , located in the San Jacinto Mountains . Initially, the company referred to the area as South San Jacinto, but changed

5394-427: The early 19th century, and that comparable earthquakes occur on average of every 160 to 220 years. The San Jacinto Valley is a 25 km long, ~4 km wide valley that was formed by extension in a region of overlap between two major parallel strands of the SJFZ. The valley is bounded by the Claremont strand to the northwest (see above) and the 25 km long Casa Loma strand to the southeast. The Clark strand, which

5487-543: The earthquake. Thomas H. Heaton , a USGS seismologist, stated that the faults in the area are difficult to track down because of the sediment deposited in the valley, which had been an intermittent drainage basin of the Colorado River . The Superstition Hills fault (SHF) lies between the Coyote Creek fault that ruptured during the 1968 event and the Imperial Fault that ruptured during the 1940 El Centro earthquake and

5580-494: The eastern recreation area of Diamond Valley Lake, has eight lighted ball fields, three soccer fields, four pickleball courts, four restrooms, and three picnic areas. The park is also adjacent to the Diamond Valley Aquatic Center. Gibbel Park contains a large children's play area, one ball field, a half basketball court, restrooms, two lighted tennis courts, a lawn bowling green, horseshoe pits, picnic areas, and

5673-431: The fault ruptured, along with an unknown fault (later named the Elmore Ranch fault). Kenneth W. Hudnut and Kerry Sieh examined the surface rupture (along with a trench investigation) in 1989 and estimated the slip rate for the prior 330 years to be 2 – 6 mm/yr (±1 mm). The Working Group used these new figures to assign a slip rate of 4 ±2 mm/yr with an average recurrence interval of 250 (+400 / -133) years for

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5766-463: The fault zone. From north to south, the segments were labeled the San Bernardino Valley, San Jacinto Valley, Anza, Borrego Mountain, and Superstition Hills. The 1995 group then added the Coyote Creek and Superstition Mountain segments, defined the Anza segment to include the Clark and Casa Loma faults, and updated the slip rates for each segment. The three northern sections (San Bernardino, San Jacinto, and Anza) were assigned 12 mm per year of slip and

5859-613: The flight school was redeveloped as Hemet-Ryan Airport . In 1950, Hemet was home to 10,000 people, joining Corona and Riverside as the three largest cities in Riverside County. Hemet was racially discriminatory. Numerous African Americans migrated to California during and after World War II in the Great Migration from such Deep South states as Mississippi, Louisiana, and Texas. Hemet was a sundown town , prohibiting African Americans from living there or even staying overnight. In

5952-412: The four remaining sections were given 4 mm of slip, and error rates were half the total estimated slip for each segment (±6 mm and ±2 mm respectively) with the exception of the Anza segment which had slightly exaggerated rates of +7 mm and −5 mm. Thirty year probabilities for segment-rupturing earthquakes were estimated using three separate models then a preferred weighted result

6045-448: The largest mastodon found in the Western United States, and 'Xena', a Columbian mammoth. Along with the two museums, science center and theater, close to Hemet there sits an outdoor amphitheater , the privately owned Ramona Bowl is a natural amphitheater located nearby in the Riverside county foothills. It is known for producing the play, Ramona . The city of Hemet is expanding upon its entertainment venues. The three largest venues are

6138-404: The main shocks and a series of aftershocks included two in the range of magnitude five. On the Mexican side of the border, 50 injuries and two deaths were reported, and 44 were treated for their injuries in California. According to the spokesperson for the state of Baja California , a motor vehicle accident east of Mexicali that claimed the lives of a mother and her four-year-old son was blamed on

6231-473: The name to Hemet when the land company filed a plat map on November 11, 1893. Following Mexico gaining independence from Spain, in 1842, settler José Antonio Estudillo received the Rancho San Jacinto Viejo Mexican land grant . In 1848, the United States annexed the California territory after defeating Mexico in the Mexican–American War . In 1887, during the first major Southern California land boom, Anglo-Americans W.F. Whittier and E.L. Mayberry founded

6324-544: The nearby Cajon Summit , 34°20′58″N 117°26′47″W  /  34.34944°N 117.44639°W  / 34.34944; -117.44639  ( Cajon Summit ) , The entire area, Cajon Pass and Cajon Summit, is often referred to as Cajon Pass, but a distinction is made between Cajon Pass and Cajon Summit. In 1851, a group of Mormon settlers led by Amasa M. Lyman and Charles C. Rich traveled through Cajon Pass in covered wagons on their way from Salt Lake City to southern California. A prominent rock formation in

6417-411: The north, the oblique normal Crafton Hills Fault Zone to the east, and the Cucamonga Thrust to the west. A series of moderate earthquakes affected this area in the 1890s, though it is uncertain how many of these occurred specifically on the SJFZ. The Claremont strand has not had a major earthquake in the instrumental period, but paleoseismology indicates that its last surface rupturing event occurred in

6510-815: The old building. A portion of Hemet is in the San Jacinto Unified School District . Hemet High School , Western Center Academy, West Valley High School and Tahquitz High School in Hemet and Hamilton High School in Anza. Acacia Middle School, Diamond Valley Middle School, Dartmouth Middle School, Western Center Academy, and Rancho Viejo Middle School. Bautista Creek Elementary, Cawston Elementary, Fruitvale Elementary, Harmony Elementary, Hemet Elementary, Jacob Wiens Elementary, Little Lake Elementary, McSweeny Elementary, Ramona Elementary, Valle Vista Elementary, Whittier Elementary and Winchester Elementary. Cottonwood School of Aguanga & Hamilton School of Anza. Cajon Pass Cajon Pass ( / k ə ˈ h oʊ n / ; Spanish : Puerto del Cajón or Paso del Cajón )

6603-539: The pass as "Cahoon Pass", suggest an alternate explanation for the name, that it is named in honor of Mormon pioneer Andrew Cahoon (pronounced similarly to Cajon), who was an early settler in nearby San Bernardino and assisted in surveying and laying out the city of San Bernardino. Cajon Pass is known for high wind, turbulence and fog. The weather over the pass can vary from foggy days with poor visibility to clear afternoons where aircraft are bounced by gusting Santa Ana winds that top 80 mph (130 km/h). The wind

6696-502: The pass near the HITOP intersection. In Santa Ana conditions, up- and downdrafts can become violent northeast of Ontario Airport, and turbulence can be experienced east to the Banning Pass , well known for turbulence. The mass and wing loading of an aircraft determine its sensitivity to turbulence, so what may seem violent in a Cessna 172 may seem only mild to moderate in a Boeing 747 . In

6789-630: The pass, where the Mormon Road and the railway merge (at 34°19′06″N 117°29′31″W  /  34.3184°N 117.4920°W  / 34.3184; -117.4920 , near Sullivan's Curve), is known as Mormon Rocks. In Spanish, the word cajón refers to a box or drawer. The name of the pass is derived from the Spanish land grant encompassing the area; it was first referred to in English on an 1852 map. Early Latter-day Saint documents, which often referred to

6882-539: The play is one of the longest-running outdoor plays in the United States. Hemet has been named a Tree City USA for 20 years by the Arbor Day Foundation for its dedication to the local forest. The city is home to the Hemet Valley Medical Center, a 320-bed general hospital. This had long been the territory of the indigenous Soboba people and Cahuilla tribe prior to Spanish colonization. During

6975-610: The population were below the poverty line , including 24.5% of those under age 18 and 9.1% of those age 65 or over. As of 2009 , about 22,300 residents of the city were employed with 4,700 unemployed (an unemployment rate of 17.4%). According to the California Economic Development Department , in 2005 the economy of Hemet was based on four main industries: retail trade, health care, educational services, and government. These industries provide 4,734, 4,441, and 3,946 jobs respectively. Other major industries in

7068-654: The population) lived in households, 155 (0.2%) lived in non-institutionalized group quarters, and 459 (0.6%) were institutionalized. There were 30,092 households, out of which 9,700 (32.2%) had children under the age of 18 living in them, 13,174 (43.8%) were opposite-sex married couples living together, 4,349 (14.5%) had a female householder with no husband present, 1,623 (5.4%) had a male householder with no wife present. There were 2,002 (6.7%) unmarried opposite-sex partnerships , and 208 (0.7%) same-sex married couples or partnerships . 9,119 households (30.3%) were made up of individuals, and 5,754 (19.1%) had someone living alone who

7161-515: The segment. Three surface-faulting events were found to have occurred along this newly added segment. A trench investigation by Larry Gurrola and Thomas Rockwell near the north shore of ancient Lake Cahuilla dated the events to 885–1440. The slip rate for the Borrego mountain segment (4 ± 2mm/yr) was extrapolated for use along the segment and a recurrence interval of 340 years was established. With at least six and as many as ten large events since 1890,

7254-474: The straighter track away from the pass, but typically ascend at 14 to 22 mph (23 to 35 km/h) and descend at 20 to 30 mph (32 to 48 km/h). With the third track, the BNSF lines have a capacity of 150 trains per day. Amtrak's Desert Wind used the pass until it quit running in 1997. The Southwest Chief runs daily between Chicago and Los Angeles, through Cajon Pass on the BNSF line. As of 2024,

7347-468: The three-hour commute by Metrolink to Union Station in downtown Los Angeles has impeded Hemet's growth as a bedroom community. According to the City of Hemet's 2023 Annual Comprehensive Financial Report, the ten largest employers in the city are: The City of Hemet has two museums and an outdoor amphitheater. The Hemet Museum is located at the intersection of State Street and Florida Avenue in downtown. It

7440-434: The town of Anza . By studying several moderate events (and their aftershocks) that occurred in 1967 (4.7 L ), 1975 (4.8 L ), and 1980 (5.5 L ), Sanders and Kanamori determined the seismogenic but locked nature of the gap. Were the entire fault segment to rupture in a single event, this newly modified length limited the potential of the segment to generate a magnitude 6.5 earthquake, similar in size to previous events along

7533-467: The trail, and it is famous among hikers. Many hikers also spend the night in the one motel at Cajon Junction. Three Southern California Edison 500 kV high voltage power lines cross the summit. These lines head to the Lugo substation northeast of Cajon Pass and connect to Path 26 and Path 46 . Both Path 26 and 46 provide the Los Angeles metro area with electricity generated from fossil fuel power plants in

7626-417: The west. The founding of Hemet, initially called South San Jacinto , predates the formation of Riverside County. This area was then still part of San Diego County . The formation of Lake Hemet helped the city to grow and stimulated agriculture in the area. The city is known for being the home of The Ramona Pageant , California's official outdoor play, set in the Spanish colonial era. Started in 1923,

7719-655: The western Imperial Valley on the Superstition Hills Fault and a previously unknown fault. Damage in Westmoreland, Imperial, and El Centro consisted of collapsed chimneys, broken windows, and damaged highways. The Worthington Road bridge, at the New River , failed due to liquefaction and at the Desert Test Range Control Center, water tanks toppled into the building and other equipment crashed through

7812-468: The whole state and creating extreme fire hazards, a fast, wind-whipped wildfire swept over Interstate 15 between California State Route 138 and the Oak Hill Road exits, sending drivers running for safety and setting 20 vehicles ablaze, officials said. The vegetation fire, which closed the I-15 southbound lanes and restricted the northbound side to one lane, overtook stalled cars. The following year

7905-436: Was 5.0%; the rental vacancy rate was 17.5%. 45,459 people (57.8% of the population) lived in owner-occupied housing units and 32,584 people (41.4%) lived in rental housing units. During 2009–2013, Hemet had a median household income of $ 32,774, with 23.3% of the population living below the federal poverty line. As of 2008 , the census estimated there were 75,163 people, over 29,341 households, and 18,031 families residing in

7998-751: Was 65 years of age or older. The average household size was 2.59. There were 19,146 families (63.6% of all households); the average family size was 3.24. There were 20,340 people (25.9%) under the age of 18, 6,814 people (8.7%) aged 18 to 24, 17,323 people (22.0%) aged 25 to 44, 16,776 people (21.3%) aged 45 to 64, and 17,404 people (22.1%) who were 65 years of age or older. The median age was 39.0 years. For every 100 females, there were 88.9 males. For every 100 females age 18 and over, there were 84.3 males. There were 35,305 housing units at an average density of 1,267.8 units per square mile (489.5 units/km ), of which 18,580 (61.7%) were owner-occupied, and 11,512 (38.3%) were occupied by renters. The homeowner vacancy rate

8091-569: Was dedicated to John B. Weston, who was president of the board of trustees from 1914 to 1920. It contains shuffleboard courts, restrooms, a playground, a basketball court, and a turf area for passive uses and games. It is located in the downtown area west of Santa Fe Street, and has an area of 4 acres (20,000 m ). The educational services of the majority of the city are under the Hemet Unified School District . It covers most of Hemet, and parts of San Jacinto, and Valle Vista, with

8184-494: Was integral to the valley's development as an agricultural area. By 1894, settlers had established a newspaper, the Hemet News , and "several general stores", the largest being Heffelfinger & Co, which occupied an entire block. Other businesses included "a drug store, an excellent barber shop, two blacksmith shops, harness shop, shoe repairing houses, two real estate offices and two lumber yards." "The most pretentious building"

8277-555: Was named the deadliest road in California. The historic Summit Inn , off the Oak Hills exit at the summit of the pass, was a historic Route 66 diner and was in the same location from 1952 to 2016, when it was destroyed by the Blue Cut fire. Some maps may show the Cajon Pass as a feature on SR 138, which crosses I-15 south of the summit between West Cajon Valley and Summit Valley. The highest point on I-15 between Los Angeles and Victorville

8370-434: Was once the oldest continually run single-screen theater in the nation. However, the theater was forced to close down in January 2010 due to water damage from a fire that destroyed adjacent store fronts. The musty smell forced the theater to stay closed for a year, which created financial struggles. As of 2011 , the foundation was incorporated as a non-profit 501(c)3 for the purpose of supporting community projects. In July 2013,

8463-560: Was presented for each segment. While the San Bernardino (37%) and San Jacinto (43%) segments both saw large increases since the 1988 report, due in part to increased estimates for slip rates and decreased estimates for inherent displacement, the Anza segment (17%) was determined to have a decreased probability, based on an increased segment length. The Coyote Creek (18%), Superstition Mountain (9%), and Superstition Hills (2%) segments received first time estimates (none were assigned in 1988) and

8556-862: Was split apart in Ocotillo Wells with one bedroom becoming detached from the rest of the home. The mainshock was felt in Arizona and Nevada and the largest aftershock damaged a theater's walls in Calexico near the Mexico–United States border . According to a report in the Los Angeles Times , this was the strongest earthquake to affect southern California since the Tehachapi earthquake fifteen years earlier. Taller buildings swayed in both Los Angeles and San Diego and power outages affected numerous areas, primarily in

8649-411: Was the two-story Hotel Mayberry, "supplied with all the modern conveniences usually found in first-class hostelries, including stationary water, baths, etc., and a complete electric light system, the power for which is furnished by the company's private plant." Also noted was the Hemet flour mill, owned by John McCool and built at a cost of $ 20,000. It was the only such mill in this area, and was housed in

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