کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4692938 1636829 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Frequency-dependent body wave attenuation characteristics in the Kumaun Himalaya
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Frequency-dependent body wave attenuation characteristics in the Kumaun Himalaya
چکیده انگلیسی

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volumes 524–525, 20 February 2012, Pages 37–42
نویسندگان
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