The attenuation mechanism of seismic waves in northwestern Himalayas

Details The attenuation mechanism of seismic waves in northwestern Himalayas The attenuation mechanism of seismic waves in northwestern Himalayas

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006geoji.167..354m&link_type=abstract

Geophysical Journal International, Volume 167, Issue 1, pp. 354-360.

Astronomy and Astrophysics

Astronomy

7

Coda Q, Direct S-Wave Q, Intrinsic Attenuation, Northwestern Himalayas, Scattering Attenuation

Scientific paper

We analysed local earthquake waveforms recorded on a broad-band seismic network in northwestern Himalayas to compute the intrinsic and scattered attenuation parameters from coda waves. Similar to other tectonically active and heterogeneous regions, attenuation-frequency relation for western Himalaya is Q-1c = (113 +/- 7)f(1.01+/-0.05) where Qc is the coda Q parameter. Intrinsic (Q-1i) and scattering (Q-1s) attenuations was separated using Qc and direct S-wave Q data (Qd). It is observed that estimated Q-1c is close to Q-1i and both of them are much larger than Q-1s suggesting that coda decay is predominantly caused by intrinsic attenuation. At higher frequencies, both the attenuation parameters Qc and, Qd are similar indicating that coda is predominantly composed of back-scattered S waves at these frequencies.

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