1979年帝王谷地震速度脉冲型地震动的识别和初步讨论  

Preliminary discussion and identification of pulse-like strong motion for the 1979 Imperial Valley earthquake

作　　者：韩璐 陶正如[1] 曹泽林 陶夏新[1,3] Han Lu;Tao Zhengru;Cao Zelin;Tao Xiaxin(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;School of Civil Engineering,Hebei University of Engineering,Hebei Handan 056038,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]中国地震局工程力学研究所中国地震局地震工程与工程振动重点实验室,哈尔滨150080 [2]河北工程大学土木工程学院,河北邯郸056038 [3]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《地震学报》2022年第1期158-169,共12页Acta Seismologica Sinica

基　　金：国家重点研发计划(2019YFE0115700);国家自然科学基金(51678540,51778197和51478443)共同资助。

摘　　要：以1979年M;6.5帝王谷地震为例,比较了小波变换法、峰点法(PPM)和零点法(ZVPM)识别近断层速度脉冲型强震记录的能力,三种方法识别出的脉冲峰值基本一致,脉冲周期略有差别.为分析速度脉冲的产生机制,包括产生时间、位置以及凹凸体的影响,借助频率-波数域格林函数法(FK法)合成近断层宽频带地震动,采用峰点法逐步识别各子源地震动叠加过程中产生的速度脉冲.通过时频方法分析叠加过程中子源地震动频率成分的变化,分析凹凸体和台站的空间关系对脉冲产生的影响,初步探讨近断层速度脉冲的产生机制.Taking the 1979 M;6.5 Imperial Valley earthquake as an example, we compared the three methods of pulse-like strong motion identification, that is, wavelet analysis, peak-point method(PPM) and zero velocity point method(ZVPM). The identified peak values are similar,however, the identified pulse periods are slightly different. To analyze the mechanism of the velocity pulse, including the generation time, location, and the impact of asperity, we use the frequency-wavenumber Green’s function(FK method) to synthesize broadband ground motion.PPM is used to gradually identify the velocity pulses during the superposition of the sub-source ground motions. Analyzing the changes of the frequency components in sub-fault ground motion during the superposition process by using time-frequency analysis method and the impact of the spatial relationship between the asperity and the station on the pulse generation, preliminarily discuss the generation mechanism of the velocity pulse.

关 键 词：速度脉冲 脉冲识别 FK法 凹凸体 脉冲参数 

分 类 号：P315.9[天文地球—地震学]