井孔水温异常与2007年宁洱6.4级地震关系分析
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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。
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.
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.
引文
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车用太,鱼金子,刘春国·1996·我国地震地下水温动态观测与研究[J].水文地质工程地质,(4):34-37·
陈沅俊,姚宝树·1999·张北6·2级地震地温短临异常特征[J].地震,19(2):179-182·
付子忠·1988·地热动态观测与地热前兆[C]//国家地震局地壳应力研究所·地壳构造与地壳应力(1)·北京:地震出版社:1-7·
李宣瑚·1981·水氡异常的扩散收缩现象[J].地震,1(5):41-43·
刘耀炜,施锦·2000·强震地下流体前兆信息特征[J].地震学报,22(1):59-64·
孙小龙,刘耀炜·2006·应力加载作用引起地下水微温度场变化的研究综述[J].国际地震动态,7:17-26·
鱼金子,车用太,刘五洲·1997·井水温度微动态形成的水动力学机制研究[J].地震,17(4):389-396·
赵谊,孙文彬,王若兰,等·2006·关于乾安地震前兆异常落实报告[R].哈尔滨:黑龙江省地震局·
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