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首页> 外文期刊>Pure and Applied Geophysics >Attenuation of Coda Waves in the Saurashtra Region, Gujarat (India)
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Attenuation of Coda Waves in the Saurashtra Region, Gujarat (India)

机译：印度古吉拉特邦（Saurashtra）地区尾声波衰减

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摘要

The attenuation characteristics based on coda waves of two areas—Jamnagar and Junagarh of Saurashtra, Gujarat (India)—have been investigated in the present study. The frequency dependent relationships have been developed for both the areas using single back scattering model. The broadband waveforms of the vertical components of 33 earthquakes (Mw 1.5–3.5) recorded at six stations of the Jamnagar area, and broadband waveforms of 68 earthquakes (Mw 1.6–5) recorded at five stations of the Junagarh area have been used for the analysis. The estimated relations for the Junagarh area are: Q c = (158 ± 5)f(0.99±0.04) (lapse time : 20 s), Q c = (170 ± 4.4)f(0.97±0.02) (lapse time : 30 s) and Q c = (229 ± 6.6)f(0.94±0.03) (lapse time : 40 s) and for the Jamnagar area are: Q c = (178 ± 3)f(0.95±0.05) (lapse time : 20 s), Q c = (224 ± 6)f(0.98±0.06) (lapse time : 30 s) and Q c = (282 ± 7)f(0.91±0.03) (lapse time : 40 s). These are the first estimates for the areas under consideration. The Junagarh area appears to be more attenuative as compared to the Jamnagar area. The increase in Q c values with lapse time found here for both the areas show the depth dependence of Q c as longer lapse time windows will sample larger area. The rate of decay of attenuation (Q −1) with frequency for the relations obtained here is found to be comparable with those of other regions of the world though the absolute values differ. A comparison of the coda-Q estimated for the Saurashtra region with those of the nearby Kachchh region shows that the Saurashtra region is less heterogeneous. The obtained relations are expected to be useful for the estimation of source parameters of the earthquakes in the Saurashtra region of Gujarat where no such relations were available earlier. These relations are also important for the simulation of earthquake strong ground motions in the region.
机译：在本研究中，已经研究了基于古达拉特邦索拉什特拉的Jamnagar和Junagarh这两个地区的尾波的衰减特性。已经使用单个反向散射模型为两个区域开发了频率相关关系。在Jamnagar地区的六个站点记录的33次地震（1.5至3.5兆瓦）垂直分量的宽带波形和在Junagarh地区的五个站点记录的68次地震（1.6至5兆瓦）的宽带波形已用于分析。 Junagarh地区的估计关系为：Q c =（158±5）f（0.99±0.04）（经过时间：20 s），Q c =（170±4.4） ）f（0.97±0.02）（经过时间：30 s）和Q c =（229±6.6）f（0.94±0.03）（经过时间：40 s） Jamnagar区域为：Q c =（178±3）f（0.95±0.05）（经过时间：20 s），Q c =（224±6）f（0.98） ±0.06）（经过时间：30 s）和Q c =（282±7）f（0.91±0.03）（经过时间：40 s）。这些是对所考虑领域的初步估计。与Jamnagar地区相比，Junagarh地区的衰减似乎更大。在这两个区域中，随着时间的流逝，Q c 值的增加表明了Q c 的深度依赖性，因为更长的流逝时间窗口将对更大的区域进行采样。尽管绝对值不同，但此处获得的关系的衰减（Q -1 ）随频率的衰减率与世界上其他地区的衰减率相当。将索拉什特拉地区与附近的卡奇地区估计的尾随Q值进行比较，结果表明索拉什特拉地区的异质性较低。预期所获得的关系将有助于估计古吉拉特邦索拉什特拉地区地震的震源参数，而此前尚无此类关系。这些关系对于模拟该地区强烈的地震动也很重要。

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