Frequency dependent attenuation of seismic waves for Delhi and surrounding area, India
<p align="left">The attenuation properties of Delhi & surrounding region have been investigated using 6<em>2</em> local earthquakes recorded at nine stations. The frequency dependent quality factors <em>Q</em><em><sub>a</sub></em&g...
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doaj-876fc4b0ac594f1787c8c5c65437b9402020-11-24T22:39:48ZengIstituto Nazionale di Geofisica e Vulcanologia (INGV)Annals of Geophysics1593-52132037-416X2015-06-0158210.4401/ag-66366022Frequency dependent attenuation of seismic waves for Delhi and surrounding area, IndiaBabita Sharma0Prasantha Chingtham1Anup K. Sutar2Sumer Chopra3Haldhar P. Shukla4Center for Seismology, Ministry of Earth Sciences, New Delhi,Center for Seismology, Ministry of Earth Sciences, New Delhi,Center for Seismology, Ministry of Earth Sciences, New Delhi,Center for Seismology, Ministry of Earth Sciences, New Delhi,Center for Seismology, Ministry of Earth Sciences, New Delhi,<p align="left">The attenuation properties of Delhi & surrounding region have been investigated using 6<em>2</em> local earthquakes recorded at nine stations. The frequency dependent quality factors <em>Q</em><em><sub>a</sub></em> (using P-waves) and <em>Q</em><em><sub>b</sub></em> (using S-waves) have been determined using the coda normalization method. Quality factor of coda-waves (<em>Q<sub>c</sub></em>) has been estimated using the single backscattering model in the frequency range from 1.5 Hz to 9 Hz. Wennerberg formulation has been used to estimate <em>Q<sub>i</sub></em> (intrinsic attenuation parameter) and <em>Q<sub>s</sub></em> (scattering attenuation parameter) for the region. The values <em>Q</em><em><sub>a</sub>, Q</em><em><sub>b, </sub>Q<sub>c, </sub>Q<sub>i</sub> and Q<sub>s</sub></em> estimated are frequency dependent in the range of 1.5Hz-9Hz. Frequency dependent relations are estimated as <em>Q</em><em><sub>a</sub>=52f<sup>1.03</sup>, Q</em><em><sub>b</sub>=98f<sup>1.07</sup> and Q<sub>c</sub>=158f<sup>0.97</sup></em>. <em>Q<sub>c</sub></em> estimates lie in between the values of <em>Q<sub>i</sub></em> and <em>Q<sub>s</sub></em> but closer to <em>Q<sub>i</sub></em> at all central frequencies. Comparison between <em>Q<sub>i</sub> </em>and <em>Q<sub>s</sub></em> shows that intrinsic absorption is predominant over scattering for Delhi and surrounding region. </p>http://www.annalsofgeophysics.eu/index.php/annals/article/view/6636CodaIntrinsicScatteringAttenuationFrequency |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Babita Sharma Prasantha Chingtham Anup K. Sutar Sumer Chopra Haldhar P. Shukla |
spellingShingle |
Babita Sharma Prasantha Chingtham Anup K. Sutar Sumer Chopra Haldhar P. Shukla Frequency dependent attenuation of seismic waves for Delhi and surrounding area, India Annals of Geophysics Coda Intrinsic Scattering Attenuation Frequency |
author_facet |
Babita Sharma Prasantha Chingtham Anup K. Sutar Sumer Chopra Haldhar P. Shukla |
author_sort |
Babita Sharma |
title |
Frequency dependent attenuation of seismic waves for Delhi and surrounding area, India |
title_short |
Frequency dependent attenuation of seismic waves for Delhi and surrounding area, India |
title_full |
Frequency dependent attenuation of seismic waves for Delhi and surrounding area, India |
title_fullStr |
Frequency dependent attenuation of seismic waves for Delhi and surrounding area, India |
title_full_unstemmed |
Frequency dependent attenuation of seismic waves for Delhi and surrounding area, India |
title_sort |
frequency dependent attenuation of seismic waves for delhi and surrounding area, india |
publisher |
Istituto Nazionale di Geofisica e Vulcanologia (INGV) |
series |
Annals of Geophysics |
issn |
1593-5213 2037-416X |
publishDate |
2015-06-01 |
description |
<p align="left">The attenuation properties of Delhi & surrounding region have been investigated using 6<em>2</em> local earthquakes recorded at nine stations. The frequency dependent quality factors <em>Q</em><em><sub>a</sub></em> (using P-waves) and <em>Q</em><em><sub>b</sub></em> (using S-waves) have been determined using the coda normalization method. Quality factor of coda-waves (<em>Q<sub>c</sub></em>) has been estimated using the single backscattering model in the frequency range from 1.5 Hz to 9 Hz. Wennerberg formulation has been used to estimate <em>Q<sub>i</sub></em> (intrinsic attenuation parameter) and <em>Q<sub>s</sub></em> (scattering attenuation parameter) for the region. The values <em>Q</em><em><sub>a</sub>, Q</em><em><sub>b, </sub>Q<sub>c, </sub>Q<sub>i</sub> and Q<sub>s</sub></em> estimated are frequency dependent in the range of 1.5Hz-9Hz. Frequency dependent relations are estimated as <em>Q</em><em><sub>a</sub>=52f<sup>1.03</sup>, Q</em><em><sub>b</sub>=98f<sup>1.07</sup> and Q<sub>c</sub>=158f<sup>0.97</sup></em>. <em>Q<sub>c</sub></em> estimates lie in between the values of <em>Q<sub>i</sub></em> and <em>Q<sub>s</sub></em> but closer to <em>Q<sub>i</sub></em> at all central frequencies. Comparison between <em>Q<sub>i</sub> </em>and <em>Q<sub>s</sub></em> shows that intrinsic absorption is predominant over scattering for Delhi and surrounding region. </p> |
topic |
Coda Intrinsic Scattering Attenuation Frequency |
url |
http://www.annalsofgeophysics.eu/index.php/annals/article/view/6636 |
work_keys_str_mv |
AT babitasharma frequencydependentattenuationofseismicwavesfordelhiandsurroundingareaindia AT prasanthachingtham frequencydependentattenuationofseismicwavesfordelhiandsurroundingareaindia AT anupksutar frequencydependentattenuationofseismicwavesfordelhiandsurroundingareaindia AT sumerchopra frequencydependentattenuationofseismicwavesfordelhiandsurroundingareaindia AT haldharpshukla frequencydependentattenuationofseismicwavesfordelhiandsurroundingareaindia |
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