海南琼海加积井水温同震效应特征和机理初探

Primary analysis on characteristics and mechanisms of coseismic effects of water temperature at the wells in Jiaji,Qionghai,Hainan Province

基于海南加积井数字化水温2007年1月—2010年4月震中距小于8 000 km、M_S≥7.8大震的同震响应资料,系统分析水温年月日正常动态特征,发现远震引起的水温同震效应特征为上升脉冲,与以往的非自流井水温同震效应以下降为主的认识不一致;水温变化幅度与震中距、震级有一定关系,加积井水温同震效应成因,可用"层内混合"作用来解释。

The water temperature dynamic variation （daily, monthly and annual changes）, together with digital data of coseismic responses of water temperatures recorded at Jiaji well, Qionghai, Hainan Province during January 2007 and April 2010 and the strong earthquakes featu ring epicentral distance less than 8000kin and Ms≥7.8 are systemically analyzed. The result reveals that the coseismic effects of water temperature induced by distant earthquake are characterized by up pulse, which is different from the previous view of down pulse character- istic of coseismic effects of water temperature of non flowing wells. Water temperature chan ges depend on epicentral distance and earthquake magnitude. The mechanisms of coseismic effects of water temperature of wells in Jiaji can be interpreted as ＂admixture within layer＂.