日本福冈地震近场地震动合成研究
首发时间:2012-12-14
摘要:本文根据断层位错分布、破裂过程、传播路径等研究结果,选取玄海作为近场研究台站,采用层状半空间的理论格林函数方法,合成日本福冈地震近场地震动。并将合成结果与观测记录进行比较,发现两者的波形基本一致且峰值大小接近。当频率在5Hz以内,合成所得加速度Fourier幅值谱与观测结果基本一致。研究结果表明,场地情况不是特别复杂的情况下,采用层状半空间格林函数方法能有效估计福冈地震的近场地震动;同时,可利用本文所采用的震源参数研究福冈地震远场地震动及其对中国东部地区的影响。
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Research on Strong Ground Motion Simulation of Near-field Ground Motion of Fukuoka Earthquake
Abstract:The slip distributions on the fault, the source rupture process and the other seismic parameters of Fukuoka earthquake determined by Japan researchers are accepted in this paper. The Genkai station is chosen as a site to analyze the Fukuoka Earthquake wave in near field by using the Green's function method for a layered half-space. A comparative study of the acceleration time history of the calculated results and records are carried out. The waveforms of the calculated results are in good agreement with those of the observed records at the Genkai station, and the Peak Values in the calculated results are close to that of the records. The Fourier spectra of the calculated acceleration time history are basically identical with those of the records while the frequency is below 5. A conclusion is draw that the near-field ground motion of Fukuoka earthquake can be effectively estimated by the method of computing Green's functions for a layered half-space in the condition of the uniform geologic site. The seismic parameters of Fukuoka earthquake are helpful to study the near-field and far-field ground motions and the influence on eastern China including Shanghai.
Keywords: Green’s function Fukuoka earthquake near-field ground motions
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