Estimation of high-frequency seismic wave radiation on fault plane of 2008 Wenchuan earthquake based on improved empiric
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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 Deyu Yin1 · Yun Dong1 · Qifang Liu2 · Yadong Chen1 · Yuexin She1 Received: 3 February 2020 / Accepted: 8 July 2020 © Springer Nature B.V. 2020
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
* Deyu Yin [email protected] Yun Dong [email protected] Qifang Liu [email protected] Yadong Chen [email protected] Yuexin She [email protected] 1
Faculty of Architecture and Civil Engineering, Huaiyin Institute of Technology, Huaian 223001, Jiangsu, China
2
School of Civil Engineering of Suzhou, University of Science and Technology, Suzhou 215011, Jiangsu, China
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Natural Hazards
1 Introduction Since Hartzell and Heaton (1983) developed the waveform inversion method for describing fault rupture history, rupture process of major earthquakes in the world have appropriately been analyzed using seismic data, global positioning system (GPS) data, and interferometric synthetic aperture radar (InSAR) (Hartzell and Heaton 1983, 2007, 2013; Wald et al. 1996; Delouis et al. 2002; Shen et al. 2009; Kimiyuki and Tomotaka 2011; Fielding et al. 2013; Yin et al. 2018). But, it is difficult to estimate high-frequency (> 1 Hz) wave radiation in a fault plane by waveform inversion because of two complex problems (Zeng et al. 1993; Kakehi et al. 1996; Nakahara et al. 1998). One problem is occurred due to the limited understanding of small-scale heterogeneity of the earth. It is difficult to precisely calculate Green’s functions when the frequency is greater than 1 Hz. The second problem is related to inversion of source rupture process for such oscillatory data. To overcome these complex problems, re
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