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《Earthquake》 1990-04
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PRECURSORY ANOMALIES OF FAULT DISPLACEMENT MEASUREMENTS BEFORE THE DATONG-YANGGAO M_S6.1 EARTHQUAKE

Gao Zhongnin Jiang Chengen Dai Lianghuan Huang Peiyu Hou Fengming(Institute of Crustal Dynamics, SSB)  
Before the Datong-Yanggao Ms 6.1 earthquake, the fault displacement measurements had shown a medium-term anomaly tendency since 1987, and a short-term anomaly appeared since May, 1989. The anomalies were dominated by horizontal fault activity. In spacial distribution, both med-term and short-term anomalies appeared clearly at measuring sites where fault moving in the same style and far from the epicenter, while only med-term anomaly, or, even no anomaly appeared at those sites close to the epicenter. These anomalous activities of faults might be related with the regional stress state.
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