| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4692938 | Tectonophysics | 2012 | 6 Pages |
We have analyzed a data set consisting of 23 well located local earthquakes to study the seismic attenuation characteristics of the Kumaun Himalaya region. These events were recorded at 9 digital seismic stations in this region during 2004–2008. The frequency-dependent attenuation of P and S waves are estimated using the extended coda-normalization method for the frequency range of 1.5, 3, 6, 8 and 12 Hz. The values of QP and QS show a ubiquitous observation of frequency dependence for the studied frequencies. We obtained QP = (22 ± 5)f(1.35 ± 0.04) and QS = (104 ± 10)f(1.3 ± 0.03) by fitting a power-law frequency dependence model with the estimated values over the whole region. Both Q values indicate a strong attenuation in the crust of Kumaun Himalaya. The ratio of QS/QP > 1 obtained for the entire analyzed frequency range may suggest that the crust is characterized by a high degree of heterogeneity.
► An attempt is made to understand the frequency dependence of body wave attenuation characteristics of Kumaun Himalaya. ► Strong frequency dependence behavior is observed for this region which could be related to the size of heterogeneities. ► Both the QP and QS values suggest the strong attenuation in the crust of Kumaun Himalaya. ► The ratio QS/QP is found to be larger than unity for the whole frequency range. ► Our results are consistent with those of other seismically active regions.
