Earthquakes

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  • Topic: Earthquake, Richter magnitude scale, Bhuj
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  • Published : May 15, 2013
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EARTHQUAKES

DHORI: Cracks on a salt marsh can be seen on this aerial view of the epicentre of the recent earthquake near Dhori village some 20 km. (12 miles) from Bhuj in the western Indian state of Gujarat, Saturday Feb. 3, 2001. (AP Photo/Enric Marti) AHMEDABAD: Residents of Ahmedabad, India, survey earthquake damage Saturday, Jan. 27, 2001. Officials predicted as many as 6,000 may have been killed in the 7.9 magnitude earthquake in western India on Friday.(AP Photo/Saurabh Das) The 2001 Gujarat earthquake occurred on January 26, 2001, India's 52nd Republic Day, at 08:46 AM local time (3:16 UTC) and lasted for over two minutes. The epicentre was about 9 km south-southwest of the village of Chobari[3] in Bhachau Taluka of Kutch District of Gujarat, India.[4] The earthquake reached a magnitude of between 7.6 and 7.7 on the moment magnitude scale and had a maximum felt intensity of X (Intense) on the Mercalli intensity scale. The quake killed around 20,000 people (including 18 in South eastern Pakistan), injured another 167,000 and destroyed nearly 400,000 homes.[5] This was an intraplate earthquake, one that occurred at a distance from an active plate boundary, so the area was not well prepared. The shock waves spread 700 km. 21 districts were affected and 600,000 people left homeless. Tectonic setting

See also: Geology of India
Gujarat lies about 400 km from the plate boundary between the Indian Plate and the Eurasian Plate, but the current tectonics is still governed by the effects of the continuing continental collision along this boundary. During the break-up of Gondwana in the Jurassic, this area was affected by rifting with a roughly west-east trend. During the collision with Eurasia the area has undergone shortening, involving both reactivation of the original rift faults and development of new low-angle thrust faults. The related folding has formed a series of ranges, particularly in central Kutch. The focal mechanism of most earthquakes is consistent with reverse faulting on reactivated rift faults. The pattern of uplift and subsidence associated with the 1819 Rann of Kutch earthquake is consistent with reactivation of such a fault. The 2001 Gujarat earthquake was caused by movement on a previously unknown south-dipping fault, trending parallel to the inferred rift structures.[6] [edit] Effects

The final death toll in Kutch was 12,290. Bhuj, situated only 20 kilometres (12 mi) from the epicenter, was devastated. Considerable damage also occurred in Bhachau and Anjar with hundreds of villages flattened in Taluka of Anjar, Bhuj & Bhachau. Over a million structures were damaged or destroyed, including many historic buildings and tourist attractions.[7] The quake destroyed around 40% of homes, eight schools, two hospitals and 4 km of road in Bhuj and partly destroyed the city's historic Swaminarayan temple and historic fort as well Prag Mahal and Aina Mahal. In Ahmedabad, Gujarat's commercial capital with a population of 5.6 million, as many as 50 multi-storied buildings collapsed and several hundred people were killed. Total property damage was estimated at $5.5 billion and rising. In Kutch, the quake destroyed about 60% of food and water supplies and around 258,000 houses - 90% of the district's housing stock. The biggest set back was the total demolition of the Bhuj Civil hospital. The Indian military provided emergency support which was later augmented by the International Federation of Red Cross and Red Crescent Society. A temporary Red Cross hospital remained in Bhuj to provide care while a replacement hospital was built.[8] Relief poured in from all over the world and over a longer period of time, the affected area was re-equipped with all the basic facilities along with state-of-the-art upgrades. The result being that Bhuj, along with several small towns and villages, is now complete with a better hospital, town and first-aid center. Also, several guidelines and rules were put into place by the...
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