关于临震异常特征的识别分析与研究——以汶川地震为例  

Recognition Analysis on Anomalous Characteristics of Imminent Earthquake——Taking Wenchuan Earthquake as an Example

作　　者：赵志闯 张燕[1] 赵莹[1] ZHAO Zhichuang;ZHANG Yan;ZHAO Ying(Key Laboratory of Earthquake Geodesy,Institute of Seismology,CEA,40 Hongshance Road,Wuhan 430071,China)

机构地区：[1]中国地震局地震研究所地震大地测量重点实验室,武汉市430071

出　　处：《大地测量与地球动力学》2021年第5期544-550,共7页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震研究所和中国地震局地壳应力研究所基本科研业务费专项(IS201926300)。

摘　　要：运用频谱分析法处理四川境内多台地震仪观测资料,分析2008年汶川大地震震前频谱特征。结果表明,在震前3~4 d出现较为明显的异常扰动现象,异常信号优势频率范围为0.18~0.25 Hz和0.10~0.18 Hz,其中前者主要受西太平洋台风影响,异常始于05-09,并于05-11强度达到最大,之后开始衰减;而后者异常从05-10开始逐步增强,震前10 h急剧增大,直至地震发生。四川境内所有台站分析结果都体现出0.10~0.18 Hz频段信号的震前急剧增加,可能与地震孕育有关。We use the frequency spectrum method to process the observation data of multiple seismographs in Sichuan and analyze the spectrum characteristics of the data before the 2008 Wenchuan earthquake.The results show that obvious abnormal disturbances occurred 3 to 4 days before the earthquake.The dominant frequency ranges of abnormal signals are 0.18 to 0.25 Hz and 0.1 to 0.18 Hz.The signals in the frequency band of 0.18 to 0.25 Hz are mainly affected by the western Pacific typhoon.The signal anomaly started on May 9 th,reached its maximum intensity on the 11 th,and then began to attenuate;while the signal in the 0.10-0.18 Hz frequency band gradually increased from May 9 th,increased sharply 10 hours before the earthquake,and reached the strongest before the earthquake.Signals in the frequency range of 0.10 to 0.18 Hz change sharply before the earthquake.The analysis results of all stations are similar,which may be related to the incubation of the earthquake.

关 键 词：临震异常 频谱分析 汶川地震 地震仪 

分 类 号：P315[天文地球—地震学]