大同地震台地电阻率变化与震兆特征  

Variation of ground resistivity and characteristic of seismic auspice in Datong Seismic Station

作　　者：殷志刚 

机构地区：[1]大同中心地震台,中国山西037006

出　　处：《地震地磁观测与研究》2006年第B08期22-27,共6页Seismological and Geomagnetic Observation and Research

摘　　要：以大同地震台地电阻率18年的观测资料为依据,研究了台站周边300km以内5级以上地震和100km以内4级以上地震,对地电阻率资料异常变化形态与地震的关系进行了探讨,结果显示,其异常形态表现为年畸变、年变的消失、U型凹斗。其长期变化趋势为NS、NW向缓慢斜向上变化,EW向有一近12年正弦波形变化。异常与地震对应关系较好。Based on the data of ground resistivity recorded at Datong station for 18 years, it was studied of the earthquakes of ML≥5 in 300 km and ML≥4 in 100km from the station. At the same time, the relation between anomalous modality of ground resistivity data and earthquake is discussed. The results indicate that the anomalous modality are represented as annual distortion, disappearance of annual variation, and U type concave curve. The longperiod variational trend is slowly increasing of NS and NW components, while the EW component shows a sine wave variation with a period of 12 years long time variational current NS and NW was tardily up, the variety of EW showed sine wave. The relation between abnormity and earthquake is significance.

关 键 词：地电阻率 异常形态 映震能力 地震前兆 

分 类 号：P315.722[天文地球—地震学]