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首页> 外文期刊>Pure and Applied Geophysics >Source Parameters of the Deadly Mw 7.6 Kashmir Earthquake of 8 October, 2005
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Source Parameters of the Deadly Mw 7.6 Kashmir Earthquake of 8 October, 2005

机译：2005年10月8日克什米尔致命Mw 7.6地震震源参数

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摘要

During the last six years, National Geophysical Research Institute, Hyderabad has established a semi-permanent seismological network of 5–8 broadband seismographs and 10–20 accelerographs in the Kachchh seismic zone, Gujarat with a prime objective to monitor the continued aftershock activity of the 2001 Mw 7.7 Bhuj mainshock. The reliable and accurate broadband data for the 8 October Mw 7.6 2005 Kashmir earthquake and its aftershocks from this network as well as Hyderabad Geoscope station enabled us to estimate the group velocity dispersion characteristics and one-dimensional regional shear velocity structure of the Peninsular India. Firstly, we measure Rayleigh-and Love-wave group velocity dispersion curves in the period range of 8 to 35 sec and invert these curves to estimate the crustal and upper mantle structure below the western part of Peninsular India. Our best model suggests a two-layered crust: The upper crust is 13.8 km thick with a shear velocity (Vs) of 3.2 km/s; the corresponding values for the lower crust are 24.9 km and 3.7 km/sec. The shear velocity for the upper mantle is found to be 4.65 km/sec. Based on this structure, we perform a moment tensor (MT) inversion of the bandpass (0.05–0.02 Hz) filtered seismograms of the Kashmir earthquake. The best fit is obtained for a source located at a depth of 30 km, with a seismic moment, Mo, of 1.6 × 1027 dyne-cm, and a focal mechanism with strike 19.5°, dip 42°, and rake 167°. The long-period magnitude (MA ~ Mw) of this earthquake is estimated to be 7.31. An analysis of well-developed sPn and sSn regional crustal phases from the bandpassed (0.02–0.25 Hz) seismograms of this earthquake at four stations in Kachchh suggests a focal depth of 30.8 km.
机译：在过去的六年中，海得拉巴国家地球物理研究所在古吉拉特邦的Kachchh地震带建立了一个由5-8个宽带地震仪和10-20个加速度计组成的半永久性地震网络，其主要目的是监测地震持续的余震活动。 2001 Mw 7.7布杰主震。来自该网络以及海得拉巴地理站的可靠和准确的宽带数据（2005年10月8日发生的克什米尔7.6级地震及其余震）和海得拉巴Geoscope站使我们能够估算该群的群速度色散特征和一维区域剪切速度结构半岛印度。首先，我们在8到35秒的时间范围内测量瑞利波和洛夫波组速度色散曲线，并将这些曲线求反，以估算印度半岛西部以下的地壳和上地幔结构。我们最好的模型建议使用两层地壳：上地壳厚13.8 km，剪切速度（Vs）为3.2 km / s。下地壳的相应值为24.9 km和3.7 km / sec。发现上地幔的剪切速度为4.65 km / sec。基于此结构，我们对克什米尔地震的带通滤波后的地震图进行矩张量（MT）反演（0.05–0.02 Hz）。对于位于30 km深度，地震矩Mo为1.6×1027达因-cm且震源机制为19.5°，倾角42°和前倾的震源，可以获得最佳拟合167°。此次地震的长期震级（MA 〜Mw ）估计为7.31。从该地震在卡奇赫四个站的带通（0.02–0.25 Hz）地震图分析了发育良好的sPn和sSn区域地壳相，表明震源深度为30.8 km。

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