Estimation of high-frequency wave radiation areas of Wenchuan earthquake by the envelope inversion of acceleration seismograms and synthesis of near-field accelerograms

被引：2
作者：
Yin D. [1 ,2 ]
Liu Q. [1 ,2 ]
机构：
[1] Institute of Engineering Mechanics, China Earthquake Administration, Harbin
[2] Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration, Harbin
来源：
Liu, Qifang (qifang_liu@126.com) | 1781年 / China University of Geosciences卷 / 41期
关键词：
Acceleration envelopes attenuation relationship; Differential evolution; High-frequency wave radiation area inversion; Seismology; Synthetic acceleration; Wenchuan earthquake;
D O I：
10.3799/dqkx.2016.125
中图分类号：
学科分类号：
摘要：
It's helpful for studying earthquake disaster by estimating seismic oscillation reasonably in Wenchuan area. Based on the line source model, the high-frequency (>1 Hz) wave radiation areas on the Wenchuan earthquake fault plane are inversed by the differential evolution method, using the acceleration envelopes attenuation relationship of Lushan earthquake and envelopes of 30 near-field stations acceleration seismograms in Wenchuan earthquake. The results indicate that the high-frequency wave radiation areas are very nonuniform, with most of the High-frequency waves radiated in: (1) the surface rupture areas, including Yingxiu, Beichuan and Nanba areas; (2) the areas close to the boundaries of the asperities, including that with epicentral distance from 60 to 90 km northeast of epicenter, and areas 30 km northeast of Beichuan and Nanba; (3) the area within 30 km length near the fault northeastern tip. Both high and low frequency wave radiation were much higher in areas with large surface rupture. Utilizing the inversed high-frequency wave radiation areas and the acceleration envelopes attenuation relationship, near-field accelerations are synthesized. The accelerations in areas with no seismic records are synthesized by the synthetic envelopes and a stationary stochastic process extracted from its near station with similar site conditions. The results could be used as the earthquake input for analyzing seismic damage of structures in Wenchuan earthquake. © 2016, Editorial Department of Earth Science. All right reserved.
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页码：1781 / 1793
页数：12
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