Estimation of high-frequency seismic wave radiation on fault plane of 2008 Wenchuan earthquake based on improved empirical Green’s function

Deyu Yin (), Yun Dong (), Qifang Liu (), Yadong Chen () and Yuexin She ()
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Deyu Yin: Huaiyin Institute of Technology
Yun Dong: Huaiyin Institute of Technology
Qifang Liu: University of Science and Technology
Yadong Chen: Huaiyin Institute of Technology
Yuexin She: Huaiyin Institute of Technology

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2020, vol. 104, issue 1, No 17, 397-412

Abstract: Abstract 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.

Keywords: Wenchuan earthquake; High-frequency wave radiation area inversion; Acceleration envelopes attenuation relationship; Differential evolution (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1007/s11069-020-04174-7

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