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Peninsular Seismicity: A comprehensive study from regional earthquake data of two decades from Guaribidanur seismic array

AuteurB.K.Gangrade, S.K.Arora
Datum1996
Classificatie 4.03.0.00/10 (INDIA - ALGEMEEN)
Voorkant

Uit de publicatie:

PENINSULAR SEISMICITY: A COMPREHENSIVE STUDY FROM
REGIONAL EARTHQUAKE DATA OF TWO DECADES FROM GAURIBIDANUR SEISMIC ARRAY

B.K.Gangrade and S.K.Arora
Seismology Section, HPPD
Bbabha Atomic Research Centre, Mumbai - 400 085

ABSTRACT

In this comprehensive study of seismicity and seismotectonics of peninsular Indian 
shield region, seismic data of regional earthquakes of nearly two decades up to 1995 
obtained at Gauribidanur array and collated where necessary with data from other 
seismological stations in the region have been analysed in detail. With slow rate of 
stress accumulation, the shield is found to have low to moderate seismicity that takes 
into account a couple of earthquakes of magnitude slightly larger than 6 during the 
historical past. The frequency-magnitude analysis of the large data set giving a b-
value at 1.15 also supports this deduction. The spatio-temporal pattern of occurrences 
of the earthquakes combined with their magnitude and seismic energy distribution is 
consistent with the view that the peninsular seismicity is largely stationary, low-to-
moderate and episodic in nature. Considering the peninsular block as a whole, all of 
these patterns reveal broadly a relative quiescence indicating a null interval of 
probably 6-7 years with respect to some significant seismic activity in the overall 
cycle.

Areas traversed by known and conjectured geologic faults as well as sub-faults, 
shear zones, cratonic contacts and other such tectonic features have been identified 
as those correlatable to moderate seismicity and its low-grade counterpart constituted 
by microearthquakes (magnitude less than 3) numbering about two-thirds of the total 
regional seismic count during the past two decades. Our estimates of magnitude 
formulated through coda duration and well calibrated by regression analysis using 
standard body-wave magnitudes up to 5.5 are reasonably reliable. Further 
investigations to parametrically model the elements of the peninsular seismicity 
are underway.

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