Crustal geoelectric structure and the focal depths of major stable continental region earthquakes in India

The Indian peninsular shield, in particular the Deccan Volcanic Province, has experienced significant seismicity during the past three decades, with the Koyna (Mw = 6.3), Latur (Mw = 6.2) and Jabalpur (Mw = 6.0) events of moderate magnitude. Focal depths of these stable continental region (SCR) eart...

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Published inCurrent science (Bangalore) Vol. 90; no. 1; pp. 107 - 113
Main Authors Patro, B. Prasanta K., Nagarajan, Nandini, Sarma, S. V. S.
Format Journal Article
LanguageEnglish
Published Current Science Association 10.01.2006
Subjects
Earthquakes
Electric current
Electrical resistivity
Flow velocity
Heat transfer
Imaging
Lithology
Mohorovicic discontinuity
RESEARCH COMMUNICATIONS
Rheology
Sounding
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Summary:The Indian peninsular shield, in particular the Deccan Volcanic Province, has experienced significant seismicity during the past three decades, with the Koyna (Mw = 6.3), Latur (Mw = 6.2) and Jabalpur (Mw = 6.0) events of moderate magnitude. Focal depths of these stable continental region (SCR) earthquakes vary over a wide range from around 6 to 35 km. Corresponding to the wide range of focal depths reported, the electrical structure as deduced from magnetotelluric studies seems to vary considerably among these regions and suggests existence of different subsurface conditions and operation of different mechanisms. While the Latur and Koyna events occurred in a relatively thick and high resistive upper crust, the Jabalpur earthquake had its focus in a conductive region at Moho levels. It is suggested that electrical characterization of crust through electromagnetic imaging helps in broadly demarcating tectonic domains characterized by differing rheology and heterogeneity.
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ISSN:0011-3891