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Spatial variation of seismicity parameters across India and adjoining areas

Kolathayar, Sreevalsa and Sitharam , TG (2012) Spatial variation of seismicity parameters across India and adjoining areas. In: Springer Science+Business Media B.V. , 60 (3). pp. 1365-1379.

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Official URL: http://dx.doi.org/10.1007/s11069-011-9898-1


An attempt has been made to quantify the variability in the seismic activity rate across the whole of India and adjoining areas (0–45°N and 60–105°E) using earthquake database compiled from various sources. Both historical and instrumental data were compiled and the complete catalog of Indian earthquakes till 2010 has been prepared. Region-specific earthquake magnitude scaling relations correlating different magnitude scales were achieved to develop a homogenous earthquake catalog for the region in unified moment magnitude scale. The dependent events (75.3%) in the raw catalog have been removed and the effect of aftershocks on the variation of b value has been quantified. The study area was divided into 2,025 grid points (1°91°) and the spatial variation of the seismicity across the region have been analyzed considering all the events within 300 km radius from each grid point. A significant decrease in seismic b value was seen when declustered catalog was used which illustrates that a larger proportion of dependent events in the earthquake catalog are related to lower magnitude events. A list of 203,448 earth- quakes (including aftershocks and foreshocks) occurred in the region covering the period from 250 B.C. to 2010 A.D. with all available details is uploaded in the website http://www.civil.iisc.ernet.in/*sreevals/resource.htm.

Item Type: Journal Article
Publication: Springer Science+Business Media B.V.
Publisher: Springer Science+Business Media B.V.
Additional Information: Copyright for this article belongs to the Springer Science+Business Media B.V.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 24 Jun 2014 09:42
Last Modified: 24 Jun 2014 09:42
URI: http://eprints.iisc.ac.in/id/eprint/49344

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