Comment on “Ground Motion Attenuation Relations for Subduction Zones”
Comment on “Ground Motion Attenuation Relations for Subduction Zones”
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对“俯冲带地震动衰减关系”的评论
DOI：
10.1785/gssrl.68.6.947
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发表时间：
1997
影响因子：
3.3
通讯作者：
Y. Fukushima
中科院分区：
文献类型：
--
作者：
Y. Fukushima
随着越来越多的观测系统投入使用，可获得的强地面运动数据量也在不断增加。通过对这些数据的回归分析，已经建立了许多衰减关系。然而，在分析之前选择数据是一项重要的任务，对这一进程至关重要。例如，在俯冲带中的事件中，不规则的大振幅可以在高达几百公里的巨大震源距离处观察到。Youngs等人（1997年）利用观测资料（包括在大震源距离处的观测资料）建立了俯冲带的地面运动衰减关系。然而，这些数据有时会导致不合理的衰减率，正如我在这里所展示的。
在日本附近，当震源位于日本海区域深处时，沿着太平洋海岸观测到的强度往往大于沿着日本海海岸观测到的强度（表1）。如图1所示，这种事件的地震射线沿着太平洋板块，然后..
The amount of strong ground motion data available is increasing as more observation systems come on line. Many attenuation relationships have been developed by regression analysis on such data. The selection of data prior to analysis is, however, an important task that is fundamental to the process. For example, irregularly large amplitudes from events in a subduction zone may be observed at great hypocentral distances up to several hundred kilometers. Youngs et al. (1997) developed ground motion attenuation relations for subduction zones using observations including those at large hypocentral distances. However, these data sometimes lead to unreasonable attenuation rates, as I show here.
Near Japan, greater intensities have often been observed along the Pacific coast than along the Japan Sea coast when the source was deep in the Japan Sea region (Table 1). As shown in Figure1, the seismic rays of such events pass along the Pacific plate and then...