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Bulletin of the Seismological Society of America; December 2006; v. 96; no. 6; p. 2449-2456; DOI: 10.1785/0120050152
© 2006 Seismological Society of America
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Frequency-Dependent Lg Attenuation in the Indian Platform

S. Mitra*,1, K. Priestley1, V. K. Gaur2,3 and S. S. Rai4

1 Bullard Laboratories
University of Cambridge
Cambridge CB3 0EZ, United Kingdom
 (S.M., K.P.)
2 Indian Institute of Astrophysics
Bangalore 560034, India
 (V.K.G.)
3 Center for Mathematical Modelling and Computer Simulations
Bangalore 560034, India
 (V.K.G.)
4 National Geophysical Research Institute
Hyderabad 500007, India
 (S.S.R.)

* Present address: Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721302, India.

We use seismograms from regional earthquakes recorded on digital seismographs in peninsular India to determine the frequency-dependent Q of Lg for the Indian platform. We measure Lg attenuation by determining the decay of spectral amplitudes with distance. The available data suggest some spatial variation in attenuation but a much denser ray-path coverage would be required to validate such observations. We, therefore, combine all the measurements of overlapping regions that span both the shield and intervening terranes to obtain an average value of attenuation for the Indian platform: Lg–Q = 665 ± 10 with the frequency exponent n = 0.67 ± 0.03. This average value of Lg attenuation for the Indian platform is similar to the average for other stable regions of the globe.




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S. K. Singh, S. D. Pimprikar, B. K. Bansal, J. F. Pacheco, R. S. Dattatrayam, and G. Suresh
An Analysis of the Mw 4.7 Jabalpur, India, Earthquake of 16 October 2000: Toward Ground-Motion Estimation in the Region from Future Events
Bulletin of the Seismological Society of America, October 1, 2007; 97(5): 1475 - 1485.
[Abstract] [Full Text] [PDF]


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