Source parameters and focal mechanisms of local earthquakes: Single broadband observatory at ISM Dhanbad |
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| Authors: | J R Kayal V K Srivastava S N Bhattacharya P K Khan Rima Chatterjee |
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| Institution: | (1) World Agency of Planetary Monitoring and Earthquake Risk Reduction, Geneva, Switzerland;(2) Seismic Monitoring Center, Tbilisi, GA, USA |
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| Abstract: | A three-component broadband seismograph is in operation since January 2007 at the Indian School of Mines (ISM) campus. We
have used the broadband seismograms of two local earthquakes M <3 recorded by this single station to illustrate its efficacy
in understanding the source processes and tectonics in Dhanbad area. Source parameters and fault plane solutions are obtained
through waveform inversion. It is observed that these two earthquakes occurred in the lower crust at a depth of 26 km by strike
slip faulting. North-south compressional and east-west tensional stresses are dominant in the area, and the lower crust is
the source area for the local earthquakes. |
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