Abstract
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) × 10−3f(−0.99±0.04) and Qs−1 = (19 ± 2) × 10−3f(−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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