Earthquake In
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The earthquake occurred on
25 April 2015 at 11:56 a.m.
NST (06:11:26
UTC) at a depth of approximately
15 km (9.3 mi) (which is considered shallow and therefore more damaging than quakes that originate deeper in the ground),[19] with its epicenter approximately 34 km (21 mi) east-southeast of Lamjung, Nepal, lasting approximately twenty seconds.[20] The earthquake was initially reported as 7.5 Mw by the
United States Geological Survey (
USGS) before it was quickly upgraded to 7.9 Mw and finally downgraded to 7.8 Mw. The
China Earthquake Networks Center (
CENC) reported the earthquake's magnitude to be
8.1 Ms. The
India Meteorological Department (
IMD) said two powerful quakes were registered in Nepal at 06:11 UTC and 06:45 UTC. The first quake measured 7.9 Mw and its epicenter was identified at a distance of 80 km to the northwest of
Kathmandu, the capital of Nepal.
Bharatpur was the nearest major city to the main earthquake, 53 km (33 mi) from the epicenter. The second earthquake was somewhat less powerful at 6.6 Mw. It occurred 65 km (40 mi) east of Kathmandu and its seismic focus lay at a depth of 10 km (6.2 mi) below the earth's surface. Over thirty-five aftershocks of magnitude
4.5 Mw or greater occurred in the day following the initial earthquake, including the one of magnitude 6.6 Mw.[21]
According to the USGS, the temblor was caused by a sudden thrust, or release of built-up stress, along the major fault line where the
Indian Plate, carrying
India, is slowly diving underneath the
Eurasian Plate, carrying much of
Europe and
Asia.[19] Kathmandu, situated on a block of crust approximately
120 km (75 miles) wide and 60 km (37 miles) long, reportedly shifted 3 m (10 ft) to the south in just 30 seconds
.[22]
The risk of a large earthquake was well known beforehand. In
2013, in an interview with seismologist
Vinod Kumar Gaur, The
Hindu quoted him
as saying, "Calculations show that there is sufficient accumulated energy [in the
MFT], now to produce an 8 magnitude earthquake. I cannot say when. It may not happen tomorrow, but it could possibly happen sometime this century, or wait longer to produce a much larger one."[23] According to
Brian Tucker, founder of a nonprofit organisation devoted to reducing casualties from natural disasters, some government officials had expressed confidence that such an earthquake would not occur again.
Tucker recounted a conversation he had had with a government official in the
1990s who said, "We don't have to worry about earthquakes anymore, because we already had an earthquake"; the previous earthquake to which he referred occurred in 1934.[24]
Nepal lies towards the southern limit of the diffuse collisional boundary where the Indian Plate underthrusts the Eurasian Plate,[25] occupying the central sector of the
Himalayan arc, nearly one-third of the 2,400 km (1,
500 mi) long Himalayas. Geologically, the Nepal Himalayas are sub-divided into five tectonic zones from north to south, east to west and almost parallel to sub-parallel.[26] These five distinct morpho-geotectonic zones are: (1) Terai Plain, (2) Sub
Himalaya (
Sivalik Range), (3)
Lesser Himalaya (
Mahabharat Range and mid valleys), (4)
Higher Himalaya, and (5) Inner Himalaya (
Tibetan Tethys).[27] Each of these zones is clearly identified by their morphological, geological, and tectonic features.[27]
The convergence rate between the plates in central Nepal is about 45 mm (1.8 in) per year. The location, magnitude, and focal mechanism of the earthquake suggest that it was caused by a slip along the
Main Frontal Thrust.[1][28]
The earthquake's effects were amplified in Kathmandu as it sits on the Kathmandu
Basin, which contains up to 600 m (2,
000 ft) of sedimentary rocks, representing the infilling of a lake.[29]
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- published: 01 May 2015
- views: 2014