岫岩5.4级地震前后振幅比变化特征  

AMPLITUDE RATIO CHARACTERISTICS OF PRIOR ANO POSTERIOR TO XIUYAN Ms5.4 EARTHQUAKE

作　　者：李芳[1] 于笑非[1] 

机构地区：[1]辽宁省地震局,辽宁沈阳110031

出　　处：《东北地震研究》2004年第3期33-38,共6页Seismological Research of Northeast China

基　　金：国家十五科技攻关计划子专题<岫岩地震序列的数字化地震观测资料的研究>中的部分结果(2001BA601B01-01-06)

摘　　要：1999年11月29日,辽宁省岫岩发生了Ms5 4地震,本文研究了该地震前后岫岩、营口、丹东、本溪、宽甸、东陵六个数字化地震台记录的数字地震波振幅比的变化特征。并通过分析S波、P波振幅关系探讨了岫岩地震前后震源机制的变化。结果表明:岫岩5 4级地震前,营口、本溪、丹东、东陵四个台在震前都出现低值异常现象;岫岩5 1级地震前,岫岩、本溪、丹东、东陵四个台震前均出现低值现象。岫岩5 4级前震序列P波最大振幅与S波最大振幅显示出较好的线性关系,但余震序列P波最大振幅与S波最大振幅则较为离散,呈非线性关系。On November 29, 1999, an earthquake with magnitude 5.4 occurred at Xiuyan area in Liaoning province. The characteristics of digital seismic wave amplitude ratio recorded in Xiuyan, Yingkou, Dandong, Benxi, Kuandian and Dongling seismic stations were studied in this paper. Besides, the hypocenter mechanisms by analyzing the S and P wave amplitude relation prior and posterior to Xiuyan earthquake are also discussed. The results show that all the four seismic stations for Yingkou , Benxi , Dandong , Dongling present the abnormal phenomenon of low value for the amplitude ratio before the Ms5.4 earthquake; Similar phenomenon took place at Xiuyan , Benxi , Dandong , Dongling seismic stations before Xiuyan Ms5.1 earthquake. The largest amplitude of P and S　wave demonstrates better linear relations among the foreshock sequences of Xiuyan Ms5.4. However, the largest amplitude of P and S wave among the aftershock sequence is comparatively dispersed, showing their non-linear relations.

关 键 词：岫岩 振幅比 S波 地震 P波 变化特征 前震 丹东 最大 营口 

分 类 号：P315[天文地球—地震学] P578.964[天文地球—固体地球物理学]