Attenuation studies based on local earthquake Coda waves in the southern Indian peninsular shield

C. H. Kumar (), C. Sarma, M. Shekar and R. Chadha

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2007, vol. 40, issue 3, 527-536

Abstract: The Dharwar craton, Cuddapah basin and the Godavari graben characterise three diverse geological and tectonic settings in the peninsular shield of India. Owing to their contiguous proximity, they offer a unique opportunity to document differences, if any, in their seismic wave attenuation characteristics that might have a bearing on the seismogenic nature of the crust in a craton, basin and a rift-like graben structure. An attempt is made here to bring out these differences using constraints from coda-Q. We considered local earthquakes with epicentral distances ranging from␣14 to 150 km recorded at the digital broadband stations at Dharwar (DHD), Cuddapah (CUD) and Kothagudem (KGD) regions to derive the frequency-dependent coda-Q relations. Using the single scattering method, we obtained the frequency-dependent Q C relationship (Q C = Q 0 f n )for each of the three geological units separately: DHD: Q C = (730.62 ± 0.09)f (0.54 ± 0.01) ; CUD: Q C = (535.06 ± 0.13)f (0.59 ± 0.01) and KGD: Q C = (150.56 ± 0.08)f (0.91 ± 0.01) . The Q C values obtained for all the three sub-regions show moderate to strong frequency dependence and essentially reflect the level of crustal heterogeneities to varying degrees. Copyright Springer Science+Business Media B.V. 2007

Keywords: Attenuation; Coda waves; Local earthquakes; South Indian shield (search for similar items in EconPapers)
Date: 2007
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Citations: View citations in EconPapers (2)

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DOI: 10.1007/s11069-006-9017-x

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