丹江口井网流体动态与尼泊尔M8.1地震同震响应分析

Fluid Dynamic and Seismic Response Analysis of Nepal M8.1 Earthquake with the Danjiangkou Well Network

分析丹江口井网3口井水位、水温2013～2015年的观测数据,建立各个测项的正常动态,总结井网对2015-04-25尼泊尔M8.1地震的响应特征,探讨同震响应差异的可能原因,初步得到水位同震响应幅度与震级、井震距的关系。结果表明,井网水位年动态受降雨影响有一定规律,月正常动态普遍显示出固体潮效应与气压效应;水温年动态平稳,年变幅度在0.1℃左右。对于尼泊尔地震同震效应,唐扒井水位阶升-阶降式脉冲变化和水温陡降-缓升式脉冲变化是由水位和水温的变化机理不同导致的;雷庄井与唐扒井水位表现出不同的同震响应特征,判断与它们所处断裂的不同走向有关;盛湾井水温阶降型同震响应幅度较唐扒井小得多,可能是观测层岩性及地下水类型等差异导致的。

We analyzes the Danjiangkou well network 3wells water level and water temperature observation data from 2013 to 2015.The normal dynamic individual test items are established.We study the different coseismic changes of water level caused by the Nepal M8.1earthquake on April 25 in 2015through the Danjiangkou fluid underground well network.The mechanism is explained.Corresponding relationships between magnitude earthquake response and surface wave magnitude and distance are deduced.We analyze the cause of the earthquake coseismic response waveform.The result indicate that well dynamic affect by rainfall water level has certain rules：monthly normal dynamics generally exhibit tidal and pressure effects;furthermore temperature dynamics are smooth,varying in the range of about 0.1℃.;different pulse changes of the Tangpa well are caused by different mechanisms of change between water temperature and well water.Different earthquake response characteristics on water level between Tangpa and Leizhuang wells may be associated with their different fault strikes.The water temperature of Shengwan well decreases much less than Tangpa well,caused by different lithology and groundwater type.