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Title:: Relationship of Bore-hole Water Temperature Anomaly and the 2007 Ning'er M6.4 Earthquake

Author(s):: LIU Yao-wei¹; SUN Xiao-long¹; WANG Shi-qin²; REN Hong-wei¹; (1.Institute of Crustal Dynamics,CEA,Beijing 100085,China)(2.Earthquake Administration of Yunnan Province,Kunming 650224,Yunnan,China)

Keywords:: Ning'er earthquake; geothermal observation; water temperature anomaly; precursor; Yunnan

摘要:: 井孔水温观测是地热观测网中主要的地震前兆观测方法。2007年宁洱6.4级地震前云南地区出现了群体性水温异常变化,包括中期趋势异常、短期异常和短临异常,短临异常出现在震前2个月以内,多数表现为温度升高,异常变化幅度在0.005～0.25 ℃之间; 短期异常多数为震前温度下降,变化幅度在0.01～0.04 ℃之间; 中期趋势异常中,既有上升型异常,也有上升转折型异常,变化幅度在0.03～0.4 ℃之间。这种配套性前兆异常有利于震前异常的识别和地震预测意见的提出。

Abstract:: The bore-hole water temperature observation is a main earthquake precursor observation method of geothermal observation network.Before the 2007 Ning'er M6.4 earthquake in Yunnan,the bore-hole water temperature anomalies,including medium-term trend anomalies,short-term anomalies,and impending-earthquake anomalies,happened in groups in Yunnan.The impending-earthquake anomalies emerged in two months before the earthquake,most of which appeared as temperature rising,and the anomalous amplitude was 0.005-0.25℃. Of the short-term anomalies,most appeared as temperature dropping,and the anomalous amplitude was 0.01-0.04℃.The medium-term anomalies included rising type and rising-turning type,and the anomalous amplitude was 0.03-0.4℃.The appearance of these matched precursor anomalies is conducive to the identification of anomalies before an earthquake and putting forward earthquake prediction advice.