摘要
On July 4,2006,a MS5.1 earthquake occurred in Wen'an county of Hebei Province of which the epicenter is near the Beijing city.The six geoelectric field monitoring stations have been in operation for several years around the Beijing area to examine the relationship between electric field changes and earthquake.This paper firstly explains the principle of the eliminating noise method by using multi-dipole observation system of the geoelectric field.Then the data observed at the stations are studied and a lot of abnormal signals preceding the Wen'an earthquake are selected,of which five abnormal signals of the geoelectric field are finally recognized as the precursory signals.The result shows that 1 there probably exists the precursory signals of the geoelectric field preceding the Wen'an earthquake;2 there are sensitive sites in the spatial distribution of the abnormal variation of the geoelectric field before the quack;3 the anomalous signals do not appear synchronously,and their durations are not same at dif-ferent stations;4 the amplitudes of the abnormal signals recorded at Baodi station are small,but large at Changli station,while the latter is farther from the epicentral area than the former.
On July 4, 2006, an Ms5.1 earthquake occurred in Wen＇an county of Hebei Province, near Beijing. Six geoelectric field monitoring stations have been in operation for several years around the Beijing area to examine the relationship between electric field changes and earthquakes. This paper firstly explains the principle of the eliminating noise method by using multi-dipole observation system of the geoelectric field. Then the data observed at the stations are studied and a lot of abnormal signals preceding the Wen＇an earthquake are selected, of which five abnormal signals of the geoelectric field are finally recognized as the precursory signals. The result shows that： ① there probably exists the precursory signals of the geoelectric field preceding the Wen＇an earthquake; ② there are sensitive sites in the spatial distribution of the abnormal variation of the geoelectric field before the quack; ③ the anomalous signals do not appear synchronously, and their durations are not same at different stations; ④ the amplitudes of the abnormal signals recorded at Baodi station are small, but large at Changli station, while the latter is farther from the epicentral area than the former.
出处
《地震学报》
CSCD
北大核心
2008年第6期615-625,共11页
Acta Seismologica Sinica
基金
Joint Seismological Science Foundation of China (106079).
关键词
文安地震
地电场
多极据观测
信号识别
Wen＇an earthquake
geoelectric field
nal recognition dipole observation
sig
