Abstract
Tectonics of a region plays important role on the attenuation characteristics of the region. Attenuation characteristics have been estimated to understand the effect of the heterogeneity of the region in a tectonically active Garhwal region of Himalaya. Seismic body wave attenuation characteristics in the region is studied using 234 short-period, seismic observations from local events. The P-wave attenuation (QP−1) and S-wave attenuation (QS−1) were estimated by applying the state-of-the-art, extended coda normalization method for the frequency range from 1.5 to 24Hz. Estimates of QP−1 and QS−1 decrease from (15.86±0.90)×10−3 and (5.35±0.51)×10−3 at 1.5Hz to (0.54±0.11)×10−3 and (0.34±0.06)×10−3 at 24Hz, respectively. The values of QP−1 and QS−1 show strong frequency dependence and fit the power-law relation QP−1(f)=(27.43±3.15)×10−3f(−1.16±0.06) and QS−1(f)=(8.05±0.74)×10−3f(−0.93±0.05), respectively. Obtained results are in the range of those reported for QP−1 and QS−1 of the other seismically active regions. The ratio of QP−1/QS−1 is larger than unity in the entire analyzed frequency range and may suggest high degree of heterogeneity in the region.
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