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Date:
October 8, 2005

Kashmir earthquake of 2005, disastrous earthquake that occurred on October 8, 2005, in the Pakistan-administered portion of the Kashmir region and in the North-West Frontier Province (NWFP; called Khyber Pakhtunkhwa after 2010) of Pakistan; it also affected adjacent parts of India and Afghanistan. At least 79,000 people were killed and more than 32,000 buildings collapsed in Kashmir, with additional fatalities and destruction reported in India and Afghanistan, making it one of the most destructive earthquakes of contemporary times.

The devastating earthquake struck at 8:50 am local time (03:50 UTC), with its epicentre located 12 miles (19 km) northeast of Muzaffarabad, the administrative centre of the Pakistani-administered Azad Kashmir area, and approximately 65 miles (105 km) north-northeast of Islamabad, the capital of Pakistan. Measured at a magnitude of 7.6 (slightly less than that of the 1906 San Francisco quake), the earthquake caused major destruction in northern Pakistan, northern India, and Afghanistan, an area that lies on an active fault caused by the northward tectonic drift of the Indian subcontinent. The Muzaffarabad area was the worst hit, and a number of villages there were totally destroyed. At least 32,335 buildings collapsed in various cities in the Kashmir region—including Anantnag and Srinagar in Jammu and Kashmir state (now union territory), India—with additional property losses reported in the Pakistani cities of Islamabad, Lahore, and Gujrat, among others. The official death toll was 79,000 for Pakistani-administered Kashmir and the NWFP, although other sources put it at 86,000, with the number injured estimated at more than 69,000. At least 1,350 people were killed and 6,266 injured in Jammu and Kashmir state in India, and the tremors were felt at a distance of up to 620 miles (1,000 km), as far away as Delhi and Punjab in northern India. Four fatalities and 14 injured survivors were reported in Afghanistan. The property loss caused by the quake left an estimated four million area residents homeless. The severity of the damage and the high number of fatalities were exacerbated by poor construction in the affected areas.

The relief effort for the survivors was hampered by numerous aftershocks, as well as by the ensuing landslides and falling rocks, which damaged highways and mountain roads and made parts of the affected region inaccessible for several days. In a display of goodwill, five crossing points were opened in the line of control (the military demarcation line between the Indian- and Pakistani-administered parts of Kashmir) to facilitate rescue efforts and the flow of relief goods. North Atlantic Treaty Organization (NATO) troops and various international aid agencies played significant roles in the subsequent relief and rescue efforts.

Warm water fuels Hurricane Katrina. This image depicts a 3-day average of actual dea surface temperatures for the Caribbean Sea and Atlantic Ocean, from August 25-27, 2005.
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The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Meg Matthias.
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earthquake, any sudden shaking of the ground caused by the passage of seismic waves through Earth’s rocks. Seismic waves are produced when some form of energy stored in Earth’s crust is suddenly released, usually when masses of rock straining against one another suddenly fracture and “slip.” Earthquakes occur most often along geologic faults, narrow zones where rock masses move in relation to one another. The major fault lines of the world are located at the fringes of the huge tectonic plates that make up Earth’s crust. (See the table of major earthquakes.)

Little was understood about earthquakes until the emergence of seismology at the beginning of the 20th century. Seismology, which involves the scientific study of all aspects of earthquakes, has yielded answers to such long-standing questions as why and how earthquakes occur.

About 50,000 earthquakes large enough to be noticed without the aid of instruments occur annually over the entire Earth. Of these, approximately 100 are of sufficient size to produce substantial damage if their centres are near areas of habitation. Very great earthquakes occur on average about once per year. Over the centuries they have been responsible for millions of deaths and an incalculable amount of damage to property.

The nature of earthquakes

Causes of earthquakes

Earth’s major earthquakes occur mainly in belts coinciding with the margins of tectonic plates. This has long been apparent from early catalogs of felt earthquakes and is even more readily discernible in modern seismicity maps, which show instrumentally determined epicentres. The most important earthquake belt is the Circum-Pacific Belt, which affects many populated coastal regions around the Pacific Ocean—for example, those of New Zealand, New Guinea, Japan, the Aleutian Islands, Alaska, and the western coasts of North and South America. It is estimated that 80 percent of the energy presently released in earthquakes comes from those whose epicentres are in this belt. The seismic activity is by no means uniform throughout the belt, and there are a number of branches at various points. Because at many places the Circum-Pacific Belt is associated with volcanic activity, it has been popularly dubbed the “Pacific Ring of Fire.”

A second belt, known as the Alpide Belt, passes through the Mediterranean region eastward through Asia and joins the Circum-Pacific Belt in the East Indies. The energy released in earthquakes from this belt is about 15 percent of the world total. There also are striking connected belts of seismic activity, mainly along oceanic ridges—including those in the Arctic Ocean, the Atlantic Ocean, and the western Indian Ocean—and along the rift valleys of East Africa. This global seismicity distribution is best understood in terms of its plate tectonic setting.

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Natural forces

Earthquakes are caused by the sudden release of energy within some limited region of the rocks of the Earth. The energy can be released by elastic strain, gravity, chemical reactions, or even the motion of massive bodies. Of all these the release of elastic strain is the most important cause, because this form of energy is the only kind that can be stored in sufficient quantity in the Earth to produce major disturbances. Earthquakes associated with this type of energy release are called tectonic earthquakes.

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