文章基本信息

标题：Kinematic source models for long-period ground motion simulations of megathrust earthquakes: validation against ground motion data for the 2003 Tokachi-oki earthquake
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作者：Asako Iwaki ; Takahiro Maeda ; Nobuyuki Morikawa 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2016
卷号：68
期号：1
页码：1-19
DOI：10.1186/s40623-016-0473-6
出版社：Springer Verlag
摘要：In this study, a method for simulating the ground motion of megathrust earthquakes at periods of approximately 2 s and longer was validated by using the characterized source model combined with multi-scale spatial heterogeneity.Source models for the M W 8.3, 2003 Tokachi-oki earthquake were constructed, and ground motion simulations were conducted to test their performance.First, a characterized source model was generated based on a source model obtained from waveform inversion analysis.Then, multi-scale heterogeneity was added to the spatial distribution of several source parameters to yield a heterogeneous source model.An investigation of the Fourier spectra and 5 % damped velocity response spectra of the simulated and observed ground motions demonstrated that adding multi-scale heterogeneity to the spatial distributions of the slip, rupture velocity, and rake angle of the characterized source model is an effective method for constructing a source model that explains the ground motion at periods of 2–20 s.It was also revealed how the complexity of the parameters affects the resulting ground motion.The complexity of the rupture velocity had the largest influence among the three parameters.
关键词：Long-period ground motion; 2003 Tokachi-oki earthquake; Characterized source model; Multi-scale heterogeneity