Seismicity, faulting, and structure of the Koyna-Warna seismic region, Western India from local earthquake tomography and hypocenter locations

Although seismicity near Koyna Reservoir (India) has persisted for ~50 years and includes the largest induced earthquake (M 6.3) reported worldwide, the seismotectonic framework of the area is not well understood. We recorded ~1800 earthquakes from 6 January 2010 to 28 May 2010 and located a subset...

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Bibliographic Details
Published in:Journal of geophysical research. Solid earth 2014-08, Vol.119 (8), p.6372-6398
Main Authors: Dixit, Madan M., Kumar, Sanjay, Catchings, R. D., Suman, K., Sarkar, Dipankar, Sen, M. K.
Format: Article
Language:English
Subjects:
3-D Vp and Vs Models
earthquake hypocenters
Earthquakes
Fault lines
Fault zones
Faults
Fractures
Geological faults
Geophysics
high pore pressure
India
induced seismicity
Poisson's ratio
Poissons ratio
Pore pressure
Reservoirs
Rivers
Seismic activity
Seismic phenomena
Seismicity
Three dimensional
Tomography
Velocity
Vp/Vs and Poisson's ratios
Water depth
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Summary:Although seismicity near Koyna Reservoir (India) has persisted for ~50 years and includes the largest induced earthquake (M 6.3) reported worldwide, the seismotectonic framework of the area is not well understood. We recorded ~1800 earthquakes from 6 January 2010 to 28 May 2010 and located a subset of 343 of the highest‐quality earthquakes using the tomoDD code of Zhang and Thurber (2003) to better understand the framework. We also inverted first arrivals for 3‐D Vp, Vs, and Vp/Vs and Poisson's ratio tomography models of the upper 12 km of the crust. Epicenters for the recorded earthquakes are located south of the Koyna River, including a high‐density cluster that coincides with a shallow depth (
ISSN:2169-9313
2169-9356
DOI:10.1002/2014JB010950