Coulomb static stress variations in the Kachchh, Gujarat, India: Implications for the occurrences of two recent earthquakes (Mw = 5.6) in the 2001 Bhuj earthquake region

Details Coulomb static stress variations in the Kachchh, Gujarat, India: Implications for the occurrences of two recent earthquakes (Mw = 5.6) in the 2001 Bhuj earthquake region Coulomb static stress variations in the Kachchh, Gujarat, India: Implications for the occurrences of two recent earthquakes (Mw = 5.6) in the 2001 Bhuj earthquake region

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007geoji.169..281m&link_type=abstract

Geophysical Journal International, Volume 169, Issue 1, pp. 281-285.

Astronomy and Astrophysics

Astronomy

4

Aftershocks, Double-Difference Relocation, Local Earthquake Moment Tensor Inversion, Static Stress Changes, Triggered Aftershocks

Scientific paper

Double difference algorithm was used to relocate aftershock sequences of two Mw = 5.6 Kachchh earthquakes (India), which have occurred on 2006 March 7 and April 6, along almost vertical strike-slip Gedi fault (GF) and south dipping reverse North Wagad fault (NWF), respectively. The relocated focal depths delineate a marked variation of 4 and 7 km in the brittle-ductile transition depths beneath GF and NWF, respectively. We modelled the Coulomb failure stress change (ΔCFS) produced by the 2001 mainshock and 2006 GEDI events on an optimally oriented plane. A strong correlation with occurrences of aftershocks and regions of increased ΔCFS is obtained on both the faults. The predicted ΔCFS on the GF increased by 0.14 MPa at 3 km depth, where the 2006 March 7 Mw = 5.6 event occurred. The variation in brittle-ductile transition depths may be related to the perturbation in geothermal gradient resulted from the presence of intrusives or varying saturation state of fluid-filled fractured rock matrix beneath both the fault zones.

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