Modeling of Source Parameters of the 15 December 2015 Deogarh Earthquake of M<sub>w</sub> 4.0

Authors

  • Prantik Mandal
     CSIR- National Geophysical Research Institute, Uppal Road, Hyderabad – 500 007
  • B. Singh
     CSIR- National Geophysical Research Institute, Uppal Road, Hyderabad – 500 007
  • P. Nagendra
     CSIR- National Geophysical Research Institute, Uppal Road, Hyderabad – 500 007
  • A. K. Gupta
     CSIR- National Geophysical Research Institute, Uppal Road, Hyderabad – 500 007

DOI:

https://doi.org/10.1007/s12594-017-0616-9

Abstract

We herein present source parameters and focal mechanism of a rare cratonic upper crustal earthquake of Mw4.0, which occurred at 8 km depth (centroid depth) below a region near Deogarh, Jharkhand. For our study, we used broadband waveform data from a seismic network of 15 three-component seismographs in the eastern Indian craton. The average seismic moment, moment magnitude and source radius are estimated to be 1.1 x 1015 N-m, 4.0 and 180.6 m, respectively. The high average stress drop of 14.27 MPa could be attributed to its lower-crustal origin. The mean corner frequency is calculated to be 4.1 Hz. To study the source mechanism, we perform a deviatoric constrained full waveform moment tensor inversion of multiple point sources on the bandpassed (0.06 - 0.14 Hz) broadband displacement data of the Deogarh event, using ISOLA software. The best fit is obtained for the source at 8 km centroid depth, with a moment magnitude 3.7, and a right-lateral strike-slip mechanism with strike 162°, dip 72° and rake 169°. The P-axis orients N24°E, which is parallel to the direction of the absolute plate motion direction of Indian plate, while T-axis orients E-W, which is parallel to the strike of the pre-existing Damodar Graben (DG) of Gondwana age. The occurrence of this earthquake is attributed to the neotectonic reactivation of a fault associated with the E-W trending DG shear zone.

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Issue

Volume 89, Issue 4, April 2017 Pages (357-488)

Section

Research Articles

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Published

2017-04-01

How to Cite

Mandal, P., Singh, B., Nagendra, P., & Gupta, A. K. (2017). Modeling of Source Parameters of the 15 December 2015 Deogarh Earthquake of M<sub>w</sub> 4.0. Journal of Geological Society of India, 89(4), 363–368. https://doi.org/10.1007/s12594-017-0616-9
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