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.
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Data and resources
The focal mechanism solutions of Wenchuan and Lushan earthquakes are from Global Centroid Moment Tensor Project database. The website is www.globalcmt.org/CMTsearch.html (last accessed on January 2, 2019). Data of the 2013 Lushan Mw6.6 earthquake from 43 strong-motion stations and data of the 2008 Wenchuan Mw7.9 earthquake from 27 strong-motion stations were provided by the Institute of Engineering Mechanics, China Earthquake Administration, Harbin, China, director Sun Bai-Tao. But, the data cannot be released to the public.
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Acknowledgements
Most figures were plotted using MATLAB. Some figures were plotted using GMT (The Generic Mapping Tools, https://gmt.soest.hawaii.edu/projects/gmt/wiki/download). This research is supported by Jiangsu Provincial Department of housing and construction project (Z413B18329), the National Natural Science Foundation of China (Grant No. 51804129, 51904112, 51904113).
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Yin, D., Dong, Y., Liu, Q. et al. Estimation of high-frequency seismic wave radiation on fault plane of 2008 Wenchuan earthquake based on improved empirical Green’s function. Nat Hazards 104, 397–412 (2020). https://doi.org/10.1007/s11069-020-04174-7
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DOI: https://doi.org/10.1007/s11069-020-04174-7