کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11001241 | 1431679 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Attenuation of short-period body waves in Northwestern Himalayan Region, India
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
مهندسی ژئوتکنیک و زمین شناسی مهندسی
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چکیده انگلیسی
The attenuation of seismic wave is one of the basic physical parameters which is closely related to the seismicity and regional tectonics activity of a particular area. This is also important for seismic hazard measurement. Seismic wave attenuation for local earthquakes is determined from the analysis of direct body waves and coda waves. The dimensionless parameter, Q, is studied in the present work, which is defined as a measure of the rate of decay of the coda waves or body waves within a specific frequency band. Digital seismogram data of 75 earthquakes that occurred in Garhwal Himalaya region during 2004-2006 and recorded at 20 different stations have been analyzed to study the seismic body and coda wave attenuation. Seismic body wave attenuation characteristics are examined by estimating the frequency dependent relationship of quality factors for P-waves, Qα and for S-waves, Qβ in the frequency range 1.5-28âHz, using 95 seismic observations with hypo central distance less than 100âkm. The extended coda normalization method was applied. The average value of Qα is found to be varied from 45.10 at 1.5âHz to 1400.0 at 28âHz, while it varies from 109.02 at 1.5âHz to 3987.0 at 28âHz for Qs. The estimated frequency dependent relation for quality factors are Qα=(29.077±8.5)f(1.16±0.01) and Qβ=(67.84±13.5)f(1.18±0.02) for P and S-waves, respectively. The rate of increase of Q(f) for P and S waves in this region is comparable with the other regions of the Himalayas. The ratio QβQα is greater than unity in the entire analyzed frequency range. It indicates that scattering is an important factor contributing to the attenuation of body wave in the region. The low Qα,β values or high, attenuation at lower frequencies and high Qα,β values or low attenuation at higher frequency may indicate that the heterogeneity decreases with increasing depth in the study region.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Dynamics and Earthquake Engineering - Volume 114, November 2018, Pages 555-562
Journal: Soil Dynamics and Earthquake Engineering - Volume 114, November 2018, Pages 555-562
نویسندگان
Priyamvada Singh, Sushil Kumar, Pitam Singh,