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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Estimation of source parameters of the 8 October 2005 Kashmir earthquake of M-w, 7.6
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Estimation of source parameters of the 8 October 2005 Kashmir earthquake of M-w, 7.6

机译：2005年10月8日克什米尔7.6级地震震源参数估算

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摘要

Aiming at mainly recording aftershock activity of the 2001 Bhuj earthquake of M-w 7.7, a semi-permanent network of five broadband seismographs has been in operation since last six years in the Kachchh area, Gujarat, India. The 8 October 2005 Kashmir earthquake of M-w 7.6 and its aftershocks have been well recorded by this network as well as by the Hyderabad Geoscope station. These data enabled us to estimate the group velocity dispersion characteristics and one-dimensional regional shear velocity structure of peninsular India. First, we measured Rayleigh- and Love-wave group velocity dispersion curves in the period range of 8 s to 35 s and inverted these curves to estimate the crustal and upper mantle structure below peninsular India. Our best model suggested a two-layer crust; 13.8 krn thick upper crust with a shear velocity (V-s) of 3.2 km/s and a 24.9 krn thick lower crust with V, 3.7 km/s. V-s for the upper mantle was found to be 4.65 km/s. Based on this structure, we then performed a moment tensor inversion of the bandpass (0.05-0.02 Hz) filtered seismograms of the 2005 Kashmir earthquake. The best fit was obtained for a source located at a depth of 30 km, with a seismic moment M-0, of 1.6 x 1027 dyne-cm, and a focal mechanism with strike 19.5 degrees, dip 42 degrees and rake 167 degrees. The long-period magnitude (M-A similar to M-w) of this earthquake was estimated to be 7.31. Analysis of well-developed sP(n) and sS(n) regional crustal phases from the bandpassed (0.02-0.25 Hz) seismograms of this earthquake at four stations in Kachchh suggested a focal depth of 30.8 km.
机译：为了主要记录2001年发生的M-w 7.7普杰地震的余震，自最近六年以来，半永久性网络由五台宽带地震仪组成，该网络已在印度古吉拉特邦的Kachchh地区投入使用。该网络以及海得拉巴Geoscope站已经很好地记录了2005年10月8日克什米尔M-w 7.6地震及其余震。这些数据使我们能够估计印度半岛的群速度色散特征和一维区域剪切速度结构。首先，我们在8 s到35 s的时间范围内测量了瑞利波和洛夫波组的速度色散曲线，并将这些曲线反转以估计印度半岛下方的地壳和上地幔结构。我们最好的模型是两层地壳。上地壳厚度为13.8 krn，剪切速度（V-s）为3.2 km / s，下地壳厚度为24.9 kn，V为3.7 km / s。发现上地幔的垂直速度为4.65 km / s。基于此结构，我们随后对2005年克什米尔地震的带通滤波后的地震图进行了矩张量反演（0.05-0.02 Hz）。对于位于30 km深度，地震矩M-0为1.6 x 1027达因-厘米，震荡机制为19.5度，倾角42度和前倾167度的震源，获得了最佳拟合。这场地震的长期震级（M-A类似于M-w）估计为7.31。从卡赫赫四个站的这次地震的带通（0.02-0.25 Hz）地震图分析发达的sP（n）和sS（n）区域地壳相，表明震源深度为30.8 km。

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