Seismologists are increasingly worried about at least one big Himalayan earthquake that is “overdue in the region” and have cautioned that both mountain towns like Shimla as well as cities in the plains like New Delhi are woefully unprepared for a mega quake. Seismologists are not sure when the “big one” will come. It could happen anytime soon or in a few hundred years. But they insist that will, sooner rather than later for which the country has to be ready.
The 2015 Nepal earthquake was caused by the ongoing tectonic collision of the Indian plate with the Eurasian plate. The three main fault lines in the Himalaya gather massive strain due to the tectonic movements. It would take the really big, infrequent earthquakes of Mw8 and above, the so-called “crack” ruptures to relieve the strain that has built up.