期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
卷 114, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2008JB006130
关键词
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资金
- Japan Society for the Promotion of Science (JSPS) [19.840, 20310105]
- Grants-in-Aid for Scientific Research [20310105] Funding Source: KAKEN
We develop a new inversion method to obtain the low- and high-frequency wave radiation processes whose border is 1 Hz. In this method, we adopt a consecutive approach to evaluate the fitness between the observed and synthetic strong motions and to synthesize the waveforms. A new feature of our inversion is an evaluation of the fitness of broadband strong motions, including the high-frequency range, using the wavelet coefficient of velocity waveforms based on the frequency-dependent characteristics of seismic waves. Another new feature is the introduction into the source inversion of a hybrid Green's function, which is constructed from theoretical and empirical Green's functions for the low- and high-frequency ranges, respectively. In order to reach the global minimum by nonlinear inversion, we introduce a multiscale approach for the low- frequency inversion. After a synthetic test, the inversion method was applied to the 2000 western Tottori earthquake for three frequency bands. The low- frequency inversion (0.0625-1 Hz) reveals that the asperity extends from the southeast of the hypocenter to the shallow part of the fault above the hypocenter. The waves of 1-2 Hz are radiated most intensely from the rupture starting area of the southeast asperity. On the other hand, the higher-frequency waves of 2-4 Hz are radiated most strongly from the edge of the southeast asperity. The inversion result suggests a possibility that broadband strong motions are generated from the asperities, and the high-frequency wave radiations are particularly related to the initiation and termination of the asperity rupture.
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