Evolution of b-values before large earthquakes of mb ≥6.0 in Andaman region

SHWETA PRASAD, CHANDRANI SINGH

Abstract


We have considered six earthquakes of mb ≥6.0, with focal depths within 45 km, in Andaman region during 2000 to 2012 to examine the spatial variations of b-value at epicentre within a one-year period prior to the occurrence of the earthquakes. We have found a correlation between the low b for the one year time interval and the occurrence of large events. The epicentral b-values of six earthquakes are lower than 1.0 and five out of six earthquakes show very low b-value at the epicentre. Our study may indicate that b-value can be employed as a possible precursor for the forecasting of a major earthquake.

 


Keywords


Gutenberg–Richter relation; b-value; Resolution; Andaman earthquake

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DOI: http://dx.doi.org/10.1344/GeologicaActa2015.13.3.3

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Geologica Acta (ISSN-1695-6133)
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