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《Seismological and Geomagnetic Observation and Research》 2016-06
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Analysis on the anomalous characters of the borehole strain before strong earthquake in Qinghai Province

Li Yuli;Li Qilei;Sun Chunling;Yang Qingchun;Yang Xiaoxia;Earthquake Administration of Qingai Province;  
The observation data recorded by the six sets of YRY-4 component borehole strainmeter in Qinghai Province were selected since 2007. Non tidal and tidal analysis method was used to analyze the data.The results showed that: 1 There were medium term rate anomaly in shear stain curve of the borehole strain meter at Golumd; The shear strain curve of the borehole strain at Delingha showed anomalies that more than 2 times of the standard deviation. 2 There were breakaway anomalies on amplitude factor curve of the borehole strain meter at Ledu Seismic Station, in very short period, and there were downward-recovery type anomalies in tide factor curve of the borehole strain meter at Ledu Seismic Station.
【Key Words】: borehole strain meter shear strain amplitude factor tidal factor
【Fund】: 中国地震局监测、预测、科研三结合课题(编号:152903)
【CateGory Index】: P315.72
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