| Synthetic sensitivity analysis of high frequency radiation of 2011 Tohoku-Oki （Mw 9.0） earthquake |
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| 作者姓名： | Haoran Meng Yongshun John Chen |
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| 作者单位： | Institute of Theoretical and Applied Geophysics, School of Earthand Space Sciences. Peking University, Beijing 100871, China |
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| 基金项目： | supported by NSFC grants(Nos.91128210and 40821062) |
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| 摘 要： | Frequency-dependent rupture behavior of sub- duction zone interplate megathrust faults has been observed by back-projection method in different frequency bands （from 0.05 to 5 Hz）. It has been suggested that the down-dip region of the Tohoku megathrust radiated strongly at high frequencies （〉10 Hz） compared with that of the up-dip region. By assuming the same source tirne function of each fault patch, we perform a synthetic sensitivity analysis to compare the energy received from the shallower parts （and further way from the receiver sites） with that frona the deeper parts （and closer to the receiver sites） of the rupture. Our results indicate that regional onshore recordings are probably not adequate to constrain the presence of far-off shore high frequency radiations because of the strong attenuation of this region.
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| 关 键 词： | 敏感性分析 高频辐射 辐射合成 东北 电气 地震 破裂行为 逆冲断层 |
Synthetic sensitivity analysis of high frequency radiation of 2011Tohoku-Oki(MW9.0) earthquake |
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| Haoran Meng Yongshun John Chen.Synthetic sensitivity analysis of high frequency radiation of 2011Tohoku-Oki(MW9.0) earthquake[J].Acta Seismologica Sinica(English Edition),2014(4):355-364. |
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| Authors: | Haoran Meng Yongshun John Chen |
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| Abstract: | Frequency-dependent rupture behavior of subduction zone interplate megathrust faults has been observed by back-projection method in different frequency bands(from 0.05 to 5 Hz). It has been suggested that the down-dip region of the Tohoku megathrust radiated strongly at high frequencies(10 Hz) compared with that of the up-dip region. By assuming the same source time function of each fault patch, we perform a synthetic sensitivity analysis to compare the energy received from the shallower parts(and further way from the receiver sites)with that from the deeper parts(and closer to the receiver sites) of the rupture. Our results indicate that regional onshore recordings are probably not adequate to constrain the presence of far-off shore high frequency radiations because of the strong attenuation of this region. |
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| Keywords: | Tohoku-Oki earthquake High frequency radiation Frequency-dependent rupture behavior |
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