Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Source Parameters and Focal Mechanisms of Local Earthquakes: Single Broadband Observatory at ISM Dhanbad


Affiliations
1 Department of Applied Geophysics, Indian School of Mines, Dhanbad - 826 004, India
2 Department Geology and Geophysics, IIT Kharagpur, Kharagpur - 721 302, India
     

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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.

Keywords

Earthquake, Broadband, Seismograph, Dhanbad.
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  • Source Parameters and Focal Mechanisms of Local Earthquakes: Single Broadband Observatory at ISM Dhanbad

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Authors

J. R. Kayal
Department of Applied Geophysics, Indian School of Mines, Dhanbad - 826 004, India
V. K. Srivastava
Department of Applied Geophysics, Indian School of Mines, Dhanbad - 826 004, India
S. N. Bhattacharya
Department Geology and Geophysics, IIT Kharagpur, Kharagpur - 721 302, India
P. K. Khan
Department of Applied Geophysics, Indian School of Mines, Dhanbad - 826 004, India
Rima Chatterjee
Department of Applied Geophysics, Indian School of Mines, Dhanbad - 826 004, India

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.

Keywords


Earthquake, Broadband, Seismograph, Dhanbad.

References