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《Earthquake》 2004-01
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Spatial-temporal characteristics of precursory anomaly of underground fluid before M_S7.0 strong earthquakes in China's continent

YAN Rui,HUANG Fu-qiong,GU Jin-ping (Center for Analysis and Prediction, CSB, Beijing 100036, China)  
Precursory data of underground fluid before 11 M_S7.0 strong earthquakes since 1969 in China′s continent were analyzed in this article. Spatial-temporal characteristics of precursory anomaly of underground fluid before M_S7.0 strong earthquakes were described by using radar and statistical diagram. The result indicates that: ① The anomalies show periodical characteristics and ununiformity in time. The mid-long-term anomalies are dispersing, short-term and impending anomalies are relatively concentrated, each anomaly roughly accounts for 50%. ② The anomalies are concentrated in a certain area and distributed along the active faults. ③ The mid-long-term anomalies appear around the earthquake source region in the earliest stage and show the process of diffusion-concentration-diffusion-concentration, and especially when enter the short-impending stage this concentrating trend becomes more apparent. ④ The percentage of the anomalies in the earthquake source region is larger than that far from the earthquake source region. That is to say: There is a trend that the percentage of the anomalies gets more and more small when the distance is farther from the earthquake source region.
【Fund】: 十五"国家科技攻关项目(15 01 05 06);; 中国地震局分析预报中心地震应急研究专题联合资助
【CateGory Index】: P315.72
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