金沙江水网地下水动态在彝良M_S5.7地震前的异常及其特征  

Groundwater Anomalies and their Characterics before Yiliang M_S5.7 Earthquake from the Jinshajiang Groundwater Observation Network

作　　者：车用太[1] 李万明[2] 刘成龙[1] 何案华[3] 鱼金子[1] 

机构地区：[1]中国地震局地质研究所,北京100029 [2]中国地震局工程力学研究所,哈尔滨150080 [3]中国地震局地壳应力所,北京100085

出　　处：《地震》2014年第1期104-111,共8页Earthquake

基　　金：中国长江三峡工程开发集团金沙江开发有限责任公司项目(JSJ(06)007)资助

摘　　要：金沙江下游水库区地震地下水动态监测网(简称金沙江水网)布设在金沙江下游向家坝水库区与溪洛渡水库区内,共有6口观测井,同时观测井水位与井水温动态。2012年9月7日云南省彝良MS5.7地震前有4口井水位与水温动态表现出明显的下降型异常,异常的时间大体上同步,异常的幅度较大,与地震的对应关系较好。金沙江水网的水位、水温动态干扰较多,特别是降雨干扰十分明显,在这样不利的条件下出现如此明显的异常,除了井震距较小外,可能与观测区与孕震区同处同一个地震构造带有关。The Jinshajiang groundwater observation network is distributed in the Xiangjia- ba reservoir and Xiluodu reservoir areas of the Jinshajiang lower reaches, and is composed of 6 wells. The primary observation items are water level and water temperature in well. The MsS. 7 earthquake occurred in Yiliang county, Yunnan province in 7, Sepetmber 2012. Some obvious anomalies of groundwater are shown in 4 wells before the earthquake, and the anomalous curve shapes are marked by drop, the anomalous times are synchronous on the whole, and the anomalous amplitudes are more lager. The corresponding relation- ship of the anomalies with the earthquake are clear. There are many interfering factors in the behavior of water level and water temperature in well, with precipitation particular stronger, however the above anomalies are shown in such unfavorable conditions. Besides the close distance between the observation wells and the epicenterr, these may also related to the same tectonic zone of observation area with the earthquake preparation area.

关 键 词：金沙江水网 彝良地震 井水位 井水温 地震异常 

分 类 号：P315.7[天文地球—地震学]