The recent earthquake in Nepal was about magnitude 7.8 which is similar to having 20 thermonuclear hydrogen bombs – each many times greater than the atomic bomb that devastated Hiroshima – ripping through the Kathmandu Valley.
Before we proceed further on the cause it is important to understand what is going on inside the earth crust which is causing the movement. You might not know but earth is constantly changing and all the continents are moving. This happens because of the tectonic plates below them. Have a look on the following video to understand this properly.
The India tectonic plate moving north at about 45mm a year is pushing under the Eurasian plate beneath the Himalayas. Two tectonic plates meet beneath the Himalayas along a fault line. The India plate is moving north at around 45mm a year and pushing under the Eurasian plate. Over time that is how the Himalayas were created. Dr Brian Baptie, head of seismology at the British Geological Survey in Edinburgh, explains the potential after-effects of the quake. Saturday’s catastrophic earthquake in Nepal occurred because of two converging tectonic plates: the India plate and the overriding Eurasia plate to the north, the U.S. Geological Survey said.