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Monday, April 27, 2015

The Nepal Valley a Dangerous Place


Simon Redfern

For some time scientists have realised that the Kathmandu valley is one of themost dangerous places in the world, in terms of earthquake risk. And now a combination of high seismic activity at the front of the Tibetan plateau, poor building standards, and haphazard urbanisation have come together with fatal consequences.

The magnitude 7.9 earthquake that hit Nepal hit just before noon, local time, on Saturday around 48 miles north west of Kathmandu. The Indian tectonic plate is driving beneath the Eurasian plate at an average rate of 45mm per year along a front that defines the edge of the Tibetan plateau. This force created the Himalayas, and Nepal lies slap bang along that front. The quake was shallow, estimated at 12km depth, and devastating as the Indian crust thrust beneath Tibet one more time.
Shake map released by the US Geological Survey. USGS

Historic buildings in the centre of Kathmandu have been reduced to rubble. Brick masonry dwellings have collapsed under clouds of dust. Weakened buildings will now be vulnerable to aftershocks, which continue to rattle Nepal through the day. Multiple aftershocks above magnitude 4 hit in the six hours following the earthquake.

Read the article here.


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