Attenuation of high frequency P and S waves in the crust of the East-Central Iran

Details Attenuation of high frequency P and S waves in the crust of the East-Central Iran Attenuation of high frequency P and S waves in the crust of the East-Central Iran

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009geoji.179.1669m&link_type=abstract

Geophysical Journal International, Volume 179, Issue 5, pp. 1669-1678.

Astronomy and Astrophysics

Astronomy

2

Body Waves, Seismic Attenuation, Wave Propagation

Scientific paper

We simultaneously estimated Qp-1 and Qs-1 by applying the extended coda-normalization method at 39 stations of three local networks in the East-Central Iran. We measured frequency-dependent attenuation of both P and S waves for the frequency range of 1.5, 3.0, 6.0, 12 and 24 Hz. We have analysed 266 three-component seismograms of 53 local earthquakes, having focal depths less than 25 km, which occurred from 2003 December 28 to 2005 April 11. By fitting power-law frequency dependence to the estimated values over the whole stations, we obtained Qp-1 = (25 +/- 3) × 10-3 f (-0.99+/-0.04) and Qs-1 = (19 +/- 2) × 10-3 f(-1.02+/-0.06) in the upper crust of the East-Central Iran, where f is frequency in Hz. Our results are in the range of those estimated for Qp-1 and Qs-1 of the other seismically active regions.

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