A sequence of earthquakes occured off the west coast of Northern Sumatra. Two large events of Magnitude (Mw) 8.4 and 8.1 (calculated from IISERK Seismological Observatory data) occurred on 11th April 2012, which was felt strongly across south, central and eastern India. The ground velocity record of these two events and their P-wave displacement spectra corrected for attenuation are plotted below.
For location map and information about ongoing aftershock activity please visit the USGS website.
Real time earthquake map and seismic monitor is avaiable at USGS-NEIC and IRIS.
Compiled by Supriyo Mitra