single backscattering model
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2020 ◽  
Author(s):  
Oussama Arab ◽  
mimoun harnafi ◽  
Ibrahim ouchen ◽  
roumaissae azguet ◽  
younes El Fellah ◽  
...  

<p>This work is presenting the attenuation of coda waves in the Rif region. Using 15 broadband stations, we investigate the attenuation of coda waves utilizing the single backscattering model of aki and chouet. We collect 70 local earthquakes during 2014 for five laps time window 20, 30, 40, 50 and 60s. We computed the quality factors at different central frequencies band on which start from 1.5, 3.0, 6.0, 9.0, 12.0 and 18.0 Hz. For 40s window length, the Qc gives average value for the whole zone of about 128,51 for 1.5 Hz and 993,44 for 18 Hz band frequencies. We observed a clear dependency between the quality factor and the frequency. Also, we have found that this region is tectonic active comparing to previous studies around the world.</p>


2015 ◽  
Vol 58 (2) ◽  
Author(s):  
Babita Sharma ◽  
Prasantha Chingtham ◽  
Anup K. Sutar ◽  
Sumer Chopra ◽  
Haldhar P. Shukla

<p align="left">The attenuation properties of Delhi &amp; 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>


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