THE CHANGE CHARACTERISTICS OF ELECTROMAGNETIC FIELD FROM BEFORE TO AFTER WENCHUAN Ms8.0 EARTHQUAKE
In recent years, Occurring four mid-strong earthquakes including Wenchuan earthquake in the southeast of GanSu and Gansu-Sichuan border region, Longnan Hanwang station observed abnormal changes relative electromagnetic field. It shows following features: 1) 2003 ~ May 2008, the earth resistivity data shows that the long trend of accelerated and turned change, and increased, descend etc. earthquake (anomaly) year is more than two times of the value of no earthquake( regular )year variation.2) In May 2008, The Wenchuan 8.0 earthquake and the aftershocks sequence, observed the auto-spectrum of magnetic and electric field abnormal changes were normal in the 1-3 orders in ELF (0.5 Hz ~ 39Hz) frequency band. The long period geoelectric field data also recorded impending change information. This earthquake prediction has provided more channels.
WenChuan earthquake anomalies spectrum resistivity anisotropy factor Short-term earthquake prediction
GAO Shude TANG Ji DU Xuebin SU Yonggang CHEN Yanping DI Guorong MEI Donglin ZHAN Yan WANG Lifeng
Longnan seismological station ,Longnan 746000, Gansu， China Institute of Geology, China Earthquake Administration, Beijing 100029, China Lanzhou base of institute of earthquake prediction, CEA, Lanzhou 730000, China.
国际会议
The 19th International Workshop on Electromagnetic Induction in the Earth(第十九届国际地球电磁感应学术研讨会)
北京
英文
322-327
2008-10-23（万方平台首次上网日期，不代表论文的发表时间）