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64-729: The Molucca Sea Collision Zone is postulated by paleogeologists to explain the tectonics of the area based on the Molucca Sea in Indonesia , and adjacent involved areas. The tectonic relationship of the Sangihe plate , Halmahera plate , and the Molucca Sea plate , plus the volcanic Halmahera Arc and the Sangihe Arc is complex. Their interrelationship constitutes the Molucca Sea Collision Zone. The north of this zone interlinks with

128-598: A god or gods are angry with women's independent, freethinking behavior, such as dressing 'immodestly', having sex or abortions. For example, Hindutva party Hindu Makkal Katchi and others blamed women's struggle for the right to enter the Sabarimala temple for the August 2018 Kerala floods , purportedly inflicted by the angry god Ayyappan . During and after natural disasters, routine health behaviors become interrupted. In addition, health care systems may have broken down as

192-495: A ground blizzard . Blizzards can impact local economic activities, especially in regions where snowfall is rare. The Great Blizzard of 1888 affected the United States, when many tons of wheat crops were destroyed. In Asia, the 1972 Iran blizzard and the 2008 Afghanistan blizzard , were the deadliest blizzards in history; in the former, an area the size of Wisconsin was entirely buried in snow. The 1993 Superstorm originated in

256-732: A tsunami occurred near Fukushima, Japan and spread through the Pacific Ocean. Some of the 18 natural hazards included in the National Risk Index of FEMA now have a higher probability of occurring, and at higher intensity, due to the effects of climate change . This applies to heat waves, droughts, wildfire and coastal flooding. A heat wave is a period of unusually and excessively hot weather. Heat waves are rare and require specific combinations of weather events to take place, and may include temperature inversions , katabatic winds , or other phenomena. The worst heat wave in recent history

320-544: A vulnerable community . It results from the combination of the hazard and the exposure of a vulnerable society. Nowadays it is hard to distinguish between natural and human-made disasters. The term natural disaster was already challenged in 1976. Human choices in architecture, fire risk, and resource management can cause or worsen natural disasters. Climate change also affects how often disasters due to extreme weather hazards happen. These " climate hazards " are floods, heat waves, wildfires, tropical cyclones, and

384-438: A vulnerable population . A natural disaster is the highly harmful impact on a society or community following a natural hazard event. The term " disaster " itself is defined as follows: "Disasters are serious disruptions to the functioning of a community that exceed its capacity to cope using its own resources. Disasters can be caused by natural, man-made and technological hazards , as well as various factors that influence

448-461: A bottleneck in human evolution, and killed three-quarters of all plant life in the northern hemisphere. However, there is considerable debate regarding the veracity of this theory. The main danger from a supervolcano is the immense cloud of ash, which has a disastrous global effect on climate and temperature for many years. A tsunami (plural: tsunamis or tsunami; from Japanese: 津波, lit. "harbour wave"; English pronunciation: /tsuːˈnɑːmi/), also known as

512-467: A cloud (generally after cooling) and settle thickly in nearby locations. When mixed with water, this forms a concrete-like material. In sufficient quantities, ash may cause roofs to collapse under its weight. Even small quantities will harm humans if inhaled – it has the consistency of ground glass and therefore causes laceration to the throat and lungs. Volcanic ash can also cause abrasion damage to moving machinery such as engines. The main killer of humans in

576-525: A consequence of human-induced climate change . A tornado is a violent and dangerous rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud , or, in rare cases, the base of a cumulus cloud . It is also referred to as a twister or a cyclone , although the word cyclone is used in meteorology in a wider sense to refer to any closed low pressure circulation. Tornadoes come in many shapes and sizes but typically take

640-478: A detailed knowledge of geological history. Layers of rock, or strata , represent a geologic record of Earth's history. Stratigraphy is the study of strata: their order, position, and age. Structural geology is concerned with rocks' deformational histories. Fossils are organic traces of Earth's history. In a historical geology context, paleontological methods can be used to study fossils and their environments, including surrounding rocks, and place them within

704-407: A few kilometers before dissipating. The most extreme tornadoes can attain wind speeds of more than 480 km/h (300 mph), stretch more than 3 km (2 mi) across, and stay on the ground for perhaps more than 100 km (60 mi). Blizzards are severe winter storms characterized by heavy snow and strong winds. When high winds stir up snow that has already fallen, it is known as

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768-569: A literal interpretation of Christian scripture , was that of a young Earth shaped by catastrophic events. Hutton, however, depicted a very old Earth, shaped by slow, continuous change. Charles Lyell further developed the theory of uniformitarianism in the 19th century. Modern geologists have generally acknowledged that Earth's geological history is a product of both sudden, cataclysmic events (such as meteorite impacts and volcanic eruptions ) and gradual processes (such as weathering, erosion, and deposition). The discovery of radioactive decay in

832-420: A result of the disaster, further reducing access to contraceptives. Unprotected intercourse during this time can lead to increased rates of childbirth, unintended pregnancies and sexually transmitted infections (STIs). Pregnant women are one of the groups disproportionately affected by natural disasters. Inadequate nutrition, little access to clean water, lack of health-care services and psychological stress in

896-411: A row of temperatures exceeding 40 °C (104 °F), with some regional areas sweltering through much higher temperatures. A flood is an overflow of water that 'submerges' land. The EU Floods Directive defines a flood as a temporary covering of land that is usually dry with water. In the sense of 'flowing water', the word may also be applied to the inflow of the tides . Flooding may result from

960-405: A seismic sea wave or tidal wave, is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Tsunamis can be caused by undersea earthquakes such as the 2004 Boxing Day tsunami , or by landslides such as the one in 1958 at Lituya Bay, Alaska , or by volcanic eruptions such as the ancient eruption of Santorini . On March 11, 2011,

1024-450: A short warning time and are short-lived. Slow onset events can also be very damaging, for example drought is a natural hazards that develops slowly, sometimes over years. A natural disaster may cause loss of life, injury or other health impacts, property damage, loss of livelihoods and services, social and economic disruption, or environmental damage. Globally, the total number of deaths from natural disasters has been reduced by 75% over

1088-559: A slope prone to failure. In many cases, the landslide is triggered by a specific event (such as a heavy rainfall , an earthquake , a slope cut to build a road, and many others), although this is not always identifiable. An avalanche is a rapid flow of snow down a slope , such as a hill or mountain. Avalanches can be triggered spontaneously, by factors such as increased precipitation or snowpack weakening, or by external means such as humans, other animals, and earthquakes . Primarily composed of flowing snow and air, large avalanches have

1152-556: A threat to humans and property, as well as wildlife . One example for a notable wildfire is the 1871 Peshtigo Fire in the United States, which killed at least 1700 people. Another one is the 2009 Victorian bushfires in Australia (collectively known as " Black Saturday bushfires "). In that year, a summer heat wave in Victoria, Australia, created conditions which fueled the massive bushfires in 2009. Melbourne experienced three days in

1216-518: A wide range of ground movements, such as rockfalls , mudflows , shallow or deep-seated slope failures and debris flows . Landslides occur in a variety of environments, characterized by either steep or gentle slope gradients, from mountain ranges to coastal cliffs or even underwater, in which case they are called submarine landslides . Gravity is the primary driving force for a landslide to occur, but there are other factors affecting slope stability that produce specific conditions that make

1280-662: Is a depression or hole in the ground caused by some form of collapse of the surface layer. When natural erosion, human mining or underground excavation makes the ground too weak to support the structures built on it, the ground can collapse and produce a sinkhole . Coastal erosion is a physical process by which shorelines in coastal areas around the world shift and change, primarily in response to waves and currents that can be influenced by tides and storm surge. Coastal erosion can result from long-term processes (see also beach evolution ) as well as from episodic events such as tropical cyclones or other severe storm events. Coastal erosion

1344-815: Is a result of a natural hazard impacting a vulnerable community . But disasters can be avoided. Earthquakes, droughts, floods, storms, and other events lead to disasters because of human action and inaction. Poor land and policy planning and deregulation can create worse conditions. They often involve development activities that ignore or fail to reduce the disaster risks . Nature alone is blamed for disasters even when disasters result from failures in development. Disasters also result from failure of societies to prepare. Examples for such failures include inadequate building norms, marginalization of people, inequities, overexploitation of resources, extreme urban sprawl and climate change . Defining disasters as solely natural events has serious implications when it comes to understanding

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1408-427: Is called the seismic focus . The point directly above the focus on the surface is called the epicenter . Earthquakes by themselves rarely kill people or wildlife – it is usually the secondary events that they trigger, such as building collapse, fires, tsunamis and volcanic eruptions, that cause death. Many of these can possibly be avoided by better construction, safety systems, early warning and planning. A sinkhole

1472-561: Is no recycling facility, plastics have flooded the camps' streets and surroundings. In contrast, the Azraq camp in Jordan for refugees from Syria has waste management services; of 20.7 tonnes of waste produced per day, 15% is recyclable. Because of the social, political and cultural context of many places throughout the world, women are often disproportionately affected by disaster. In the 2004 Indian Ocean tsunami, more women died than men, partly due to

1536-512: Is one of the most significant coastal hazards. It forms a threat to infrastructure, capital assets and property. Volcanoes can cause widespread destruction and consequent disaster in several ways. One hazard is the volcanic eruption itself, with the force of the explosion and falling rocks able to cause harm. Lava may also be released during the eruption of a volcano; as it leaves the volcano, it can destroy buildings, plants and animals due to its extreme heat. In addition, volcanic ash may form

1600-624: Is referred to as a "typhoon"; a "cyclone" occurs in the South Pacific and Indian Ocean. The deadliest hurricane ever was the 1970 Bhola cyclone ; the deadliest Atlantic hurricane was the Great Hurricane of 1780 , which devastated Martinique, St. Eustatius and Barbados. Another notable hurricane is Hurricane Katrina , which devastated the Gulf Coast of the United States in 2005. Hurricanes may become more intense and produce more heavy rainfall as

1664-474: Is the most important driver of economic losses. However, part of these are also due to human-induced climate change . During emergencies such as natural disasters and armed conflicts more waste may be produced, while waste management is given low priority compared with other services. Existing waste management services and infrastructures can be disrupted, leaving communities with unmanaged waste and increased littering. Under these circumstances human health and

1728-654: Is the study of past climates recorded in geological time. Natural hazard A natural disaster is the very harmful impact on a society or community after a natural hazard event. Some examples of natural hazard events include avalanches , droughts , earthquakes , floods , heat waves , landslides , tropical cyclones , volcanic activity and wildfires . Additional natural hazards include blizzards , dust storms , firestorms , hails , ice storms , sinkholes , thunderstorms , tornadoes and tsunamis . A natural disaster can cause loss of life or damage property . It typically causes economic damage. How bad

1792-526: The Japanese Ministry of the Environment . Some of this waste, mostly plastic and styrofoam washed up on the coasts of Canada and the United States in late 2011. Along the west coast of the United States, this increased the amount of litter by a factor of 10 and may have transported alien species. Storms are also important generators of plastic litter. A study by Lo et al. (2020) reported a 100% increase in

1856-780: The Philippine Mobile Belt . Some call this linkage the Philippine–Halmahera Arc and consider it an integral part of the elongated zone of convergence extending north through the Philippines into eastern Taiwan . In the Molucca Sea Collision Zone model, the Molucca Sea plate has been totally consumed by the arc-arc collision of the Halmahera Arc and the Sangihe Arc of eastern Indonesia . The magmatic systems are reaching

1920-665: The Spitak Earthquake ). The Asia-Pacific region is the world's most disaster prone region. A person in Asia-Pacific is five times more likely to be hit by a natural disaster than someone living in other regions. Between 1995 and 2015, the greatest number of natural disasters occurred in America, China and India. In 2012, there were 905 natural disasters worldwide, 93% of which were weather-related disasters. Overall costs were US$ 170 billion and insured losses $ 70 billion. 2012

1984-446: The 17th century, Nicolas Steno was the first to observe and propose a number of basic principles of historical geology, including three key stratigraphic principles: the law of superposition , the principle of original horizontality , and the principle of lateral continuity . 18th-century geologist James Hutton contributed to an early understanding of the Earth's history by proposing

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2048-416: The National Risk Index of FEMA: avalanche , coastal flooding , cold wave , drought , earthquake , hail , heat wave , tropical cyclone , ice storm , landslide , lightning , riverine flooding, strong wind, tornado , tsunami , volcanic activity , wildfire , winter weather. In addition, there are also dust storms . The term natural disaster has been called a misnomer already in 1976. A disaster

2112-453: The aftermath of the disaster can lead to a significant increase in maternal morbidity and mortality. Furthermore, shortage of healthcare resources during this time can convert even routine obstetric complications into emergencies. Once a vulnerable population has experienced a disaster, the community can take many years to repair and that repair period can lead to further vulnerability. The disastrous consequences of natural disaster also affect

2176-542: The amount of microplastics on beaches surveyed following a typhoon in Hong Kong in 2018. A significant amount of plastic waste can be produced during disaster relief operations. Following the 2010 earthquake in Haiti , the generation of waste from relief operations was referred to as a "second disaster". The United States military reported that millions of water bottles and styrofoam food packages were distributed although there

2240-406: The capability to capture and move ice, rocks, and trees. An earthquake is the result of a sudden release of energy in the Earth's crust that creates seismic waves . At the Earth's surface, earthquakes manifest themselves by vibration, shaking, and sometimes displacement of the ground. Earthquakes are caused by slippage within geological faults . The underground point of origin of the earthquake

2304-434: The causes of a disaster and the distribution of political and financial responsibility in disaster risk reduction , disaster management , compensation, insurance and disaster prevention. Using natural to describe disasters misleads people to think the devastating results are inevitable, out of our control, and are simply part of a natural process. Hazards (earthquakes, hurricanes, pandemics, drought etc.) are inevitable, but

2368-602: The country. As a result, many desalination plants were built for the first time ( see list ). In 2011, the State of Texas lived under a drought emergency declaration for the entire calendar year and suffered severe economic losses. The drought caused the Bastrop fires. Wildfires are large fires which often start in wildland areas. Common causes include lightning and drought but wildfires may also be started by human negligence or arson . They can spread to populated areas and thus be

2432-410: The damage is depends on how well people are prepared for disasters and how strong the buildings, roads, and other structures are. Scholars have been saying that the term natural disaster is unsuitable and should be abandoned. Instead, the simpler term disaster could be used. At the same time the type of hazard would be specified. A disaster happens when a natural or human-made hazard impacts

2496-464: The damage typically associated with storms, such as winds, hail and flooding, the lightning itself can damage buildings, ignite fires and kill by direct contact. Most deaths from lightning occur in the poorer countries of the Americas and Asia, where lightning is common and adobe mud brick housing provides little protection. Typhoon , cyclone , cyclonic storm and hurricane are different names for

2560-485: The end of their life as island arcs and are becoming a single collision zone, lending weight to the contention that Halmahera and Sangihe should be regarded as tectonic plates rather than volcanic arcs. Seismic and tomographic discrepancies in the mantle up to 400 km below Mindanao in the Philippines, indicate it is a more advanced northern extension of the Molucca Sea Collision Zone. Paleogeologist During

2624-493: The environment are often negatively impacted. Natural disasters (e.g. earthquakes, tsunamis, hurricanes) have the potential to generate a significant amount of waste within a short period. Waste management systems can be out of action or curtailed, often requiring considerable time and funding to restore. For example, the tsunami in Japan in 2011 produced huge amounts of debris: estimates of 5 million tonnes of waste were reported by

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2688-628: The event that it significantly harms a community. An example of the distinction between a natural hazard and a disaster is that an earthquake is the hazard which caused the 1906 San Francisco earthquake disaster. A natural hazard is a natural phenomenon that might have a negative effect on humans and other animals , or the environment . Natural hazard events can be classified into two broad categories: geophysical and biological . Natural hazards can be provoked or affected by anthropogenic processes , e.g. land-use change , drainage and construction. There are 18 natural hazards included in

2752-439: The exposure and vulnerability of a community." The US Federal Emergency Management Agency (FEMA) explains the relationship between natural disasters and natural hazards as follows: "Natural hazards and natural disasters are related but are not the same. A natural hazard is the threat of an event that will likely have a negative impact. A natural disaster is the negative impact following an actual occurrence of natural hazard in

2816-555: The fact that fewer women knew how to swim. During and after a natural disaster, women are at increased risk of being affected by gender based violence and are increasingly vulnerable to sexual violence. Disrupted police enforcement, lax regulations, and displacement all contribute to increased risk of gender based violence and sexual assault. In addition to LGBT people and immigrants , women are also disproportionately victimized by religion-based scapegoating for natural disasters: fanatical religious leaders or adherents may claim that

2880-441: The form of a visible condensation funnel , the narrow end of which touches the Earth and is often encircled by a cloud of debris and dust . Tornadoes can occur one at a time, or can occur in large tornado outbreaks associated with supercells or in other large areas of thunderstorm development. Most tornadoes have wind speeds of less than 180 km/h (110 mph), are approximately 75 m (250 ft) across, and travel

2944-429: The geologic time scale. Sedimentology is the study of the formation, transport, deposition, and diagenesis of sediments . Sedimentary rocks , including limestone, sandstone, and shale, serve as a record of Earth's history: they contain fossils and are transformed by geological processes, such as weathering, erosion, and deposition, through deep time. Historical geology makes use of relative dating in order to establish

3008-409: The immediate surroundings of a volcanic eruption is pyroclastic flows , consisting of a cloud of hot ash which builds up in the air above the volcano and rushes down the slopes when the eruption no longer supports the lifting of the gases. It is believed that Pompeii was destroyed by a pyroclastic flow. A lahar is a volcanic mudflow or landslide. The 1953 Tangiwai disaster was caused by a lahar, as

3072-408: The impact they have on society is not. Thus, the term natural disaster is unsuitable and should be abandoned in favor of the simpler term disaster , while also specifying the category (or type) of hazard. As of 2019, the countries with the highest share of disability-adjusted life years ( DALY ) lost due to natural disasters are Bahamas , Haiti , Zimbabwe and Armenia (probably mainly due to

3136-410: The last 100 years, due to the increased development of countries, increased preparedness, better education, better methods, and aid from international organizations. Since the global population has grown over the same time period, the decrease in number of deaths per capita is larger, dropping to 6% of the original amount. The death rate from natural disasters is highest in developing countries due to

3200-410: The late 19th century and the development of radiometric dating techniques in the 20th century provided a means of deriving absolute ages of events in geological history. Geology is considered a historical science; accordingly, historical geology plays a prominent role in the field. Historical geology covers much of the same subject matter as physical geology, the study of geological processes and

3264-406: The like. Some things can make natural disasters worse. Examples are inadequate building norms, marginalization of people and poor choices on land use planning . Many developing countries do not have proper disaster risk reduction systems. This makes them more vulnerable to natural disasters than high income countries . An adverse event only becomes a disaster if it occurs in an area with

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3328-496: The lower quality of building construction, infrastructure, and medical facilities. Global economic losses due to extreme weather, climate and water events are increasing. Costs have increased sevenfold from the 1970s to the 2010s. Direct losses from disasters have averaged above US$ 330 billion annually between 2015 and 2021. Socio-economic factors have contributed to this trend of increasing losses, such as population growth and increased wealth. This shows that increased exposure

3392-525: The mental health of affected communities, often leading to post-traumatic symptoms. These increased emotional experiences can be supported through collective processing, leading to resilience and increased community engagement. Disasters stress government capacity, as the government tries to conduct routine as well as emergency operations. Some theorists of voting behavior propose that citizens update information about government effectiveness based on their response to disasters, which affects their vote choice in

3456-437: The movement of lithospheric plates has structured the Earth throughout its geological history. Weathering , erosion , and deposition are examples of gradual geological processes, taking place over large sections of the geologic time scale. In the rock cycle , rocks are continually broken down, transported, and deposited, cycling through three main rock types: sedimentary , metamorphic , and igneous . Paleoclimatology

3520-569: The next election. Indeed, some evidence, based on data from the United States, reveals that incumbent parties can lose votes if citizens perceives them as responsible for a poor disaster response or gain votes based on perceptions of well-executed relief work. The latter study also finds, however, that voters do not reward incumbent parties for disaster preparedness , which may end up affecting government incentives to invest in such preparedness. Landslides , also known as landslips, or rockslides, are several forms of mass wasting that may include

3584-518: The same phenomenon: a tropical storm that forms over an ocean. It is caused by evaporated water that comes off of the ocean and becomes a storm . It is characterized by strong winds, heavy rainfall and thunderstorms. The determining factor on which term is used is based on where the storm originates. In the Atlantic and Northeast Pacific, the term "hurricane" is used; in the Northwest Pacific, it

3648-556: The sequence of geological events in relation to each another, without determining their specific numerical ages or ranges. Absolute dating allows geologists to determine a more precise chronology of geological events, based on numerical ages or ranges. Absolute dating includes the use of radiometric dating methods, such as radiocarbon dating , potassium–argon dating , and uranium–lead dating . Luminescence dating , dendrochronology , and amino acid dating are other methods of absolute dating. The theory of plate tectonics explains how

3712-468: The theory of uniformitarianism , which is now a basic principle in all branches of geology. Uniformitarianism describes an Earth formed by the same natural phenomena that are at work today, the product of slow and continuous geological changes. The theory can be summarized by the phrase "the present is the key to the past." Hutton also described the concept of deep time. The prevailing conceptualization of Earth history in 18th-century Europe, grounded in

3776-510: The volume of a body of water, such as a river or lake , becoming higher than usual, causing some of the water to escape its usual boundaries. While the size of a lake or other body of water will vary with seasonal changes in precipitation and snow melt, a flood is not considered significant unless the water covers land used by humans, such as a village, city or other inhabited area, roads or expanses of farmland. Severe storms, dust clouds and volcanic eruptions can generate lightning . Apart from

3840-414: The ways in which they shape the Earth's structure and composition. Historical geology extends physical geology into the past. Economic geology , the search for and extraction of fuel and raw materials , is heavily dependent on an understanding of the geological history of an area. Environmental geology , which examines the impacts of natural hazards such as earthquakes and volcanism , must rely on

3904-710: Was a moderate year. 45% were meteorological (storms), 36% were hydrological (floods), 12% were climatological (heat waves, cold waves, droughts, wildfires) and 7% were geophysical events (earthquakes and volcanic eruptions). Between 1980 and 2011 geophysical events accounted for 14% of all natural catastrophes. Developing countries often have ineffective communication systems as well as insufficient support for disaster risk reduction and emergency management . This makes them more vulnerable to natural disasters than high income countries . Natural hazards occur across different time scales as well as area scales. Tornadoes and flash floods are rapid onset events, meaning they occur with

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3968-749: Was no operational waste management system. Over 700,000 plastic tarpaulins and 100,000 tents were required for emergency shelters. The increase in plastic waste, combined with poor disposal practices, resulted in open drainage channels being blocked, increasing the risk of disease . Conflicts can result in large-scale displacement of communities. People living under these conditions are often provided with minimal waste management facilities. Burn pits are widely used to dispose of mixed wastes, including plastics. Air pollution can lead to respiratory and other illnesses. For example, Sahrawi refugees have been living in five camps near Tindouf, Algeria for nearly 45 years. As waste collection services are underfunded and there

4032-467: Was the European Heat Wave of 2003 . The 2010 Northern Hemisphere summer resulted in severe heat waves which killed over 2,000 people. The heat caused hundreds of wildfires which led to widespread air pollution and burned thousands of square kilometers of forest. Well-known historical droughts include the 1997–2009 Millennium Drought in Australia which led to a water supply crisis across much of

4096-533: Was the 1985 Armero tragedy in which the town of Armero was buried and an estimated 23,000 people were killed. Volcanoes rated at 8 (the highest level) on the volcanic explosivity index are known as supervolcanoes . According to the Toba catastrophe theory , 75,000 to 80,000 years ago, a supervolcanic eruption at what is now Lake Toba in Sumatra reduced the human population to 10,000 or even 1,000 breeding pairs, creating

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