Short-Term and Imminent EM Characteristics of the Wenchuan Earthquake
Based on latest observation data by MDCB-5 in combination with geologic setting, the characteristics of short-term and imminent EM anomalies of the Wenchuan earthquake are studied and correlated. It is confirmed that the M8.0 earthquake was caused by outbreak of the Longmenshan thrust clockwise slip faults controlled by eastward movement of Tibet plateau. It is believed that seismic precursors were not observed before the earthquake. Studies show that some short-term and imminent EM anomalies of the impending earthquake were observed by MDCB-5. The characteristics of these EM precursors including features of background EM anomalies, the structure, magnitude and orientation of local EM anomalies are analyzed, and the epicenter of the earthquake is predicted by intersection method of 32-azimuth EM anomalies from four observatories, which coincides with the area of Wenchuan earthquake. From the study the short-term and imminent EM anomalies can be used as precursors of similar earthquakes in the future.
Wenchuan earthquake EM anomalies MDCB-5 Precursor
WEN Baihong WANG Wenxiang
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China XiAn Branch of China Coal Research Institute, XiAn, Shanxi, 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
334-338
2008-10-23（万方平台首次上网日期，不代表论文的发表时间）