腾冲台地电场在中强地震前异常特征分析

Analysis on Precursory Abnormal Characteristics of Geoelectric Field before the Modorately strong Earthquake at Tengchong Station

将腾冲台地电场2008~2011年观测资料与2008~2011年间云南腾冲及周边地区发生的多次中强地震进行震例对比分析,发现腾冲台地电场观测数据在震前出现了不同程度的异常变化,对这些异常变化进行深入分析总结,寻找规律和变化特征,异常主要表现为短期和临震异常:异常持续时间较短为1~100天,异常结束至发震时间1~80天;长极距异常幅度在11~50 mV之间,短极距异常幅度在7~30 mV之间。异常结束3个月内应注意5级左右地震发生。

In this paper,the observation data of the geoelectric in field are analyzed,and using the comparative analysis,many strong earthquakes are occurred around Tengchong from 2008 to 2011. These abnormal changes in-depth analysis summary, looking for regularity and variation characteristics,Founding, analysis and summary the abnormal changes in the electric field of Tengchong geoelectrical field before the earthquake. Mainly manifested as short-term and impending earthquake anomalies: the abnormal duration is shorter from 1 day to 100 days. Abend to earthquake time 1 day to 80 days, The long pole anomaly range is between 11 mV and 50 mV, short pole anomaly amplitude between 7 mV and 30 mV. An exception occurred within 3 months in ca/se of the M_L5. Looking for regularity and changing characteristics. In the future, the application of the geoelectrical field observation data to provide important basis for earthquake prediction, especially the short impending prediction.