Study on Application of the Low-Frequency Electromagnetic Signals in Earthq uake Prediction

摘要：

One week before the wenchuan Ms 8.0 earthquake in Sichuan Province,the ionospheric anomalies was captured bv DEMETER satellite,and an abnormal electromagnetic radiation also appeared in ELF band electromagnetic field data.Before and after the main shock and a series of aftershocks,the corresponding anomaly information was captured in ELF electromagnetic observation data. The paper used spectrum method to inspect the ELF electric field,magnetic field data in frequency band of 0.5 Hz～3 Hz,which was sampled at Longnan seismic station during January 2008 and January 2009. The auto power spectrum of electricity and magnetic field showed sudden jump significantly before Wenchuan earthquake and the aftershocks. The abnormal magnitude is related to the earthquake magnitude and the epicenter distance.etc. The electromagnetic anomalies during shocks is bigger than normal month 1～5 orders of magnitude;A coseismic electromagnetic phenomenon were found in Ms 6.1 strong aftershocks of August 1,and 5,2008 in the Longnan ELF observation. The Paper compared the ELF data with the earthquake data,and found that the magnetic field component and the seismic waves arrive simultaneously,but the reaction of electric field component iS not obviously.

关键词： WenChuan earthquake low-frequency EM anomalies coseismic signal short-term earthquake prediction

作者: Shude Gao Xiaofeng Liu Weibin Luo Jie Cheng Yonggang Su

作者单位: Longnan Central seismic station, Longnan 746000, Gansu Province, China Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China Department of Geology Engineering and Geomatic Engineering, Changan University, Xian 710054, China

会议类型: 国际会议

会议名称: 2009 International Conference on Earth Science and Technology(2009地球科学与技术国际学术讨论会)

会议地点: 北京

会议语种:英文

页码: 26-28

在线出版日期: 2009-05-14（万方平台首次上网日期，不代表论文的发表时间）