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Spatial variation of the aftershock activity across the Kachchh Rift Basin and its seismotectonic implications

Singh, AP and Mishra, OP and Kumar, D and Kumar, S and Yadav, RBS (2012) Spatial variation of the aftershock activity across the Kachchh Rift Basin and its seismotectonic implications. Journal of Earth System Science, 121 (2). pp. 439-451.

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We analyzed 3365 relocated aftershocks with magnitude of completeness (Mc) ≥1.7 that occurred in the Kachchh Rift Basin (KRB) between August 2006 and December 2010. The analysis of the new aftershock catalogue has led to improved understanding of the subsurface structure and of the aftershock behaviour. We characterized aftershock behaviour in terms of a-value, b-value, spatial fractal dimension (D s ), and slip ratio (ratio of the slip that occurred on the primary fault and that of the total slip). The estimated b-value is 1.05, which indicates that the earthquake occurred due to active tectonics in the region. The three dimensional b-value mapping shows that a high b-value region is sandwiched around the 2001 Bhuj mainshock hypocenter at depths of 20–25 km between two low b-value zones above and below this depth range. The D s -value was estimated from the double-logarithmic plot of the correlation integral and distance between hypocenters, and is found to be 2.64 ± 0.01, which indicates random spatial distribution beneath the source zone in a two-dimensional plane associated with fluid-filled fractures. A slip ratio of about 0.23 reveals that more slip occurred on secondary fault systems in and around the 2001 Bhuj earhquake (Mw 7.6) source zone in KRB.

Item Type: Article
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Uncontrolled Keywords: Aftershocks;b-value;fractal dimension;frequency–magnitude slip ratio
Subjects: Earth Resources and Remote Sensing
Depositing User: INCOIS Library
Date Deposited: 11 Dec 2013 05:27
Last Modified: 11 Dec 2013 05:27

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