共和7.0级地震前地震活动特征

本文从背景性地震活动、地震活动的时空分布以及前兆震群活动等基本特征出发，分析了共和地震前地震活动的异常特征。结果说明，共和地震是发生在青藏高原北部地震区地震活动增强的背景中。震前２０年存在着中强地震空区。震前２－３年几乎同步出现了多种测震学异常。但无短临信息的前震活动。

THE FEATURE OF SEISMIC ACTIVITY BEFORE GONGHE EARTHQUAKE WITH M=7.0 IN QINGHAI PROVINCE

Based on the basical features of seismic background, temporal and spatial distribution of seismicity and precursory earthquake swarm activity, this paper discussed the anomalous characteristics of seismic activity before Gonghe earthquake. The result shows that Gonghe earthquake occurred in the northern seismic region of Tibet Platean on a background with increasing the seismic activity. There was a gap of moderately strong earthquakes twenty years before the earthquake, and many seismometric anomalies were synchronously occurred two or three years before Gonghe earthquake, but there wasn't any fore-shock activity with the short-term and impending information.