对汶川8.0级地震前四川地区地下流体观测异常的研究
|
摘要
研究给出汶川8.0级地震前四川地区地下水位、温泉水温、水化学和气体组分观测异常:地下水位观测点20个,汶川8.0级地震前,有4个观测点观测值出现异常,异常台比例P=4/20=0.20;温泉水温观测点26个,出现异常的5个测点,分布在四川西部地区,P=0.19;水氡观测点12个,出现短期异常1个,P=0.08;气体观测点4个,出现异常1个,P=0.25。同时对疑似或有争议的异常测项进行分析说明。汶川8.0级地震前观测到的地下水水位、温泉水温、水化学和气体组分观测异常的地区,不是分布在龙门山断裂带。震前异常数量少,异常种类和长、中、短、临异常的配套性不明显。同时给出2002年1月至2008年4月四川地区周、月震情会商给出的此类异常项数均值供参阅。
The anomaly data changes of the groundwater level,the hot-spring temperature,the water chemical and the gas component before the 2008 Wenchuan Ms8. 0 earthquake in Sichuan province are studied in this paper. In Sichuan province the number of the anomaly data changes of the groundwater levels is 4 over 20 observation points and the ratio of number of abnormal stations to the number of normal stations is 0. 20( P = 4 /20 = 0. 20) . At the same time,there are 5 anomaly data changes of hot-spring temperature over 26 observation points. The stations observing the abnormal data changes are located in the western areas of Sichuan Province. Among 12 observation points of water radon,there is only one item of the short-term anomaly. One fourth of the gas observation points have anomaly data changes. Simultaneously,the suspected or controversial anomaly data before the 2008 Wenchuan Ms8. 0 earthquake are analyzed. The stations,which have the abnormal data of the groundwater,hot-spring temperature,water chemical and gas constituent,are not loacted in the area of Longmenshan fault distribution. The quantity of abnormal data changes is less. The long-,medium-,short-and impend-anomaly data changes are not obvious. The average value of this kind of abnormal items recorded by weekly and monthly consultation decision from January 2002 to April 2008 is listed for future reference.
The anomaly data changes of the groundwater level,the hot-spring temperature,the water chemical and the gas component before the 2008 Wenchuan Ms8. 0 earthquake in Sichuan province are studied in this paper. In Sichuan province the number of the anomaly data changes of the groundwater levels is 4 over 20 observation points and the ratio of number of abnormal stations to the number of normal stations is 0. 20( P = 4 /20 = 0. 20) . At the same time,there are 5 anomaly data changes of hot-spring temperature over 26 observation points. The stations observing the abnormal data changes are located in the western areas of Sichuan Province. Among 12 observation points of water radon,there is only one item of the short-term anomaly. One fourth of the gas observation points have anomaly data changes. Simultaneously,the suspected or controversial anomaly data before the 2008 Wenchuan Ms8. 0 earthquake are analyzed. The stations,which have the abnormal data of the groundwater,hot-spring temperature,water chemical and gas constituent,are not loacted in the area of Longmenshan fault distribution. The quantity of abnormal data changes is less. The long-,medium-,short-and impend-anomaly data changes are not obvious. The average value of this kind of abnormal items recorded by weekly and monthly consultation decision from January 2002 to April 2008 is listed for future reference.
引文
[1]路明勇,房宗绯,赵丽葵.汶川8.0级地震前地下流体长趋势变化特征讨论[J].地震,2010,30(1):61-71.
[2]晏锐.汶川8.0级地震引起的中国大陆井水位同震响应特征分析[J].国际地震动态,2009(4).
[2]晏锐.汶川8.0级地震引起的中国大陆井水位同震响应特征分析[J].国际地震动态,2009(4).
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心