1998年海原4.7级地震前平凉地区的前兆异常及观测资料的映震能力检验

PRECURSORY ANOMALIES AND A TEST ON ABILITY FOR REFLECTING EARTHQUAKE OF OBSERVATION DATA OF SOME STATIONS IN PINGLIANG AREA,GANSU PROVINCE BEFORE THE 1998 HAIYUAN M S4.7 EARTHQUAKE

介绍了１９９８ 年７ 月２９ 日宁夏海原４ ．７ 级地震前，平凉地区几个观测台站的水氡、水位和地电阻率的异常反映，及对该次地震的预报情况．研究表明，平凉地区的几种观测手段对该地区及邻近的宁夏西海固地区５ 级左右地震和南北地震带北段６ 级以上地震有较好的映震能力．

Anomalies of radon content in groundwater,ground water level and ground resistivity observed by some stations in Pingliang area,Gansu province before the Haiyuan M S4.7 earthquake on July 29,1998 is analysed and prediction to the M S4.7 earthquake is introduced.The results show it is better that some observation items of Pingliang area reflect earthquakes with magnitude of 5 or so in Pingliang area and Xiji Haiyuan Guyuan area and M S≥6 earthquakes in northern segment of NS seismic belt.