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Estimation of high-frequency seismic wave radiation on fault plane of 2008 Wenchuan earthquake based on improved empirical Green’s function
Natural Hazards ( IF 3.3 ) Pub Date : 2020-07-17 , DOI: 10.1007/s11069-020-04174-7
Deyu Yin , Yun Dong , Qifang Liu , Yadong Chen , Yuexin She

A new strategy for inversion of high-frequency wave radiation condition on the fault plan is exhibited. One-dimensional source model of large earthquake was divided into subfaults, each subfault contains a series of subsources to express high-frequency wave radiation. Envelope of large earthquakes can be expressed as a root-mean-squared with combination of envelope attenuation relationship from all subsources. The envelope attenuation relationship is considered as the empirical Green’s function. Distribution of subsources is estimated by envelope inversion. According to this method, the high-frequency (> 1 Hz) wave radiation areas of 2008 Wenchuan earthquake are generally inverted by the differential evolution using acceleration data from 27 near-field stations, while acceleration waveforms of the Lushan earthquake from 43 near-field stations were utilized to create attenuation envelope. High-frequency waves radiated in: (1) surface rupture areas, including Yingxiu and Beichuan areas; (2) close to the boundaries of asperities near Yingxiu, Yuejiashan, Beichuan and Nanba areas; (3) within 30 km length near the fault northeastern tip; (4) around Qingchuan area.



中文翻译:

基于改进格林经验函数的2008年汶川地震断裂面高频地震波辐射估计

提出了一种基于故障计划的高频辐射条件反演新策略。大地震的一维震源模型被划分为多个子震源,每个子震源包含一系列表示高频波辐射的震源。大地震的包络可以表示为均方根,并结合所有子源的包络衰减关系。包络衰减关系被认为是经验格林函数。子源的分布通过包络反演来估计。按照这种方法,通常使用27个近场台站的加速度数据通过差分演化对2008年汶川地震的高频(> 1 Hz)波辐射区域进行反演,同时利用来自43个近场站的庐山地震的加速度波形来创建衰减包络。辐射的高频波:(1)地表破裂区域,包括映秀和北川地区;(2)靠近映秀,岳家山,北川和南坝地区附近的凹凸边界;(3)在断层东北端附近30公里之内;(4)青川一带。

更新日期:2020-07-18
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