地磁HHT频谱分析在地震预测中的应用  

The application of geomagnetic HHT spectrum analysis in earthquake prediction

作　　者：徐强 张建国 王同利[3] XU Qiang;ZHANG Jianguo;WANG Tongli(Hebei Earthquake Agency,Shijiazhuang 050021,China;Handan Seismic Station,Hebei Province 056001,China;Beijing Earthquake Agency,Beijing 100080,China)

机构地区：[1]河北省地震局,石家庄050021 [2]邯郸地震监测中心站,河北056001 [3]北京市地震局,北京100080

出　　处：《地震地磁观测与研究》2022年第1期63-67,共5页Seismological and Geomagnetic Observation and Research

基　　金：国家自然科学基金项目(项目编号:41274079)。

摘　　要：利用希尔伯特-黄变换方法,对成都、重庆、拉萨地磁台记录到的汶川M_(S)8.0地震、汶川地震余震地磁数据进行分析处理,发现在4级及以上中强度地震前3个月内地磁相对观测HHT频谱中能观测到一定程度的地震前兆异常,各分量的优势频率大部分在0.01 Hz,但并不是距震中300 km内的每个台站的地磁相对观测分量HHT频谱中都能明显地观测到异常,这可能与台站所处的构造位置有关。The geomagnetic data of Wenchuan M_(S)8.0 earthquake and its aftershocks recorded by Chengdu,Chongqing,Lhasa and other stations are analyzed and processed by using the Hilbert-Huang transform method.It is found that a certain degree of earthquake precursor anomalies should be observed in the relative observation of geomagnetic HHT spectrum of the stations within three months before the earthquakes with magnitude larger than 4 or medium-strong earthquakes.The dominant frequency of each component is mostly 0.01 Hz,but not all stations within 300 km present anomalies in the HHT spectrum of the geomagnetic relative observation component.This may be relevant to the structures of the station location.

关 键 词：地磁HHT频谱分析 希尔伯特-黄变换 地震前兆 

分 类 号：P315.7[天文地球—地震学]