1990年4月26日共和7．0级地震前兆异常特征研究

在１９９０年４月２６日青海共和７．０级地震前，共和震中周围及附近地区出现了大量的地震活动性和前兆异常，其中地震频次、条带、空区、地下水（水流量和氡值）异常十分显著。在分析这些典型异常时空分布特征的基础上，初步研究了孕震的阶段性与前兆阶段性的关系，同时对地震震源机制和可能的孕震模式进行了初步的探讨。

STUDY ON CHARACTERISTICS OF PRECURSORY ANOMALIES OF GONGHE EARTHQUAKE Ms=7.0 ON Apr.26,1990

Before Gonghe earthquake Ms7.0,there are a lot of Seismic activity activity and precursory anormalies around epicenter area and its adjacent areas.Among them, seismic frequency, seismic belt,seismicgap and ground water(mainly referred to water flow and radon content)anomalies are most obvious.On the basis of summarizing these typical earthquake precursory anomalies,this paper not only studies studies and analyses their characteristics and changing process both on space and time distribution, but also does the preliminary study on the relationship between seismogenic stages and and anomalous stages, focal mechanism and possible seismogenic model.