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首页> 外文期刊>Pure and Applied Geophysics >Attenuation of P- and S-waves in the Chamoli Region, Himalaya, India
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Attenuation of P- and S-waves in the Chamoli Region, Himalaya, India

机译：印度喜马拉雅山Chamoli地区的P波和S波衰减

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The attenuation properties of the crust in the Chamoli region of Himalaya have been examined by estimating the frequency-dependent relationships of quality factors for P waves (Qα) and for S waves (Qβ) in the frequency range 1.5–24 Hz. The extended coda normalization method has been applied on the waveforms of 25 aftershocks of the 1999 Chamoli earthquake (M 6.4) recorded at five stations. The average value of Qα is found to be varied from 68 at 1.5 Hz to 588 at 24 Hz while it varies from 126 at 1.5 Hz to 868 at 24 Hz for Qβ. The estimated frequency-dependent relations for quality factors are Qα = (44 ± 1)f(0.82±.04) and Qβ = (87 ± 3)f(0.71±.03). The rate of increase of Q(f) for P and S waves in the Chamoli region is comparable with the other regions of the world. The ratio Qβ/Qα is greater than one in the region which along with the frequency dependence of quality factors indicates that scattering is an important factor contributing to the attenuation of body waves in the region. A comparison of attenuation relation for S wave estimated here (Qβ = 87f0.71) with that of coda waves (Qc = 30f1.21) obtained by Mandal et al. (2001) for the same region shows that Qc > Qβ for higher frequencies (>8 Hz) in the region. This indicates a possible high frequency coda enrichment which suggests that the scattering attenuation significantly influences the attenuation of S waves at frequencies >8 Hz. This observation may be further investigated using multiple scattering models. The attenuation relations for quality factors obtained here may be used for the estimation of source parameters and near-source simulation of earthquake ground motion of the earthquakes, which in turn are required for the assessment of seismic hazard in the region. Keywords Attenuation - P waves - S waves - Qα - Qβ - Chamoli
机译：通过估计P波（Q α）和S波（Q β<的质量因子的频率相关关系），研究了喜马拉雅山Chamoli地区地壳的衰减特性。 / sub>）在1.5-24 Hz的频率范围内。扩展的尾声归一化方法已应用于五个站点记录的1999年Chamoli地震（M 6.4）的25次余震的波形。发现Q α的平均值从1.5 Hz的68变化到24 Hz的588，而Q β。质量因子的估计频率相关关系为Q α =（44±1）f （0.82±.04）和Q β = （87±3）f （0.71±.03）。在Chamoli地区，P波和S波的Q（f）增长率与世界其他地区相当。 Q β / Q α的比值在该区域大于1，这与品质因数的频率依赖性一起表明，散射是导致人体衰减的重要因素。该地区的海浪。此处估算的S波（Q β = 87f 0.71 ）与尾波（Q c = 30f 1.21 ），由Mandal等获得。 （2001）对同一区域的研究表明，该区域中较高频率（> 8 Hz）的Q c β。这表明可能存在高频尾气富集，这表明散射衰减会显着影响频率> 8 Hz的S波的衰减。可以使用多个散射模型进一步研究该观察结果。此处获得的质量因数的衰减关系可用于震源参数估计和地震地震动的近震源模拟，这反过来又是评估该地区地震危险所必需的。衰减-P波-S波-Q α-Q β-Chamoli

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