摘要
分析了福州连江江南井水位、水温对多次大地震的同震响应资料,该井在多次大地震后同震形态表现为水位震荡-水温下降-水温上升或水位震荡-水温上升型。分析研究表明:该井水位的同震变化幅度随着震中距的增大而衰减,随着震级的增大而增大。并进一步探讨了震后该井呈现水位震荡-水温下降-水温上升和水位震荡-水温上升两种同震现象的机理,结合前人所提出的同震响应机理,分析认为,在地震波的作用下,井水位产生振动效应,可能导致地下水向下垂直运动速率增大,上层冷水快速混入观测含水层中,引起温度快速下降,同时,由于地震波激发了井深部较热的含水层中的热流体混入井孔中,导致水温上升,震后由于水位振动停止,较热的含水层混合通道闭合,井水温通过井壁及井水间的热传递而使水温逐渐恢复到背景水平。
This paper analyzes the coseismic response of well water level, water temperature data of Jiangnan well in Lianjiang for multiple large earthquakes, and the cosemic form of Jiangnan well in several large earthquakes is water level shock-water temperature falling-water temperature rising type or water level shock- water temperature rising type. Analysis shows that： the amplitude of coseismic changes of water level decreases with the epicentral distance increases, and increase of the magnitude increase. Combining with the previous proposed coseismic response mechanism, the paper further explores the mechanism of coseimic phenomena of well water level. The results show that： vibration effect of well water level of Jiangnan well resulted by the seismic wave lead to increase of the downward vertical velocity of groundwater and the rapid mixing of upper cold water mixing rapid with the observation aquifer, which cause the temperature decreased rapidly; because of the earthquake wave stimulates the hot water in the deeper layers of the well to be mixed into the wellbore, resulting in an increase in water temperature. After the earthquake, the vibration stopped and the hot aquifer mixing channel is closed. The water temperature was gradually returned to the background level by the heat transfer between the borehole wall and well water.
出处
《华南地震》
2016年第4期50-57,共8页
South China Journal of Seismology
基金
中国地震局2016年度震情跟踪定向工作任务(2016020304)
福建省地震局2014年科研专项资助(SF201418)联合资助
关键词
井水位
水温
同震响应
同震机理
含水层
Water level
Water temperature
Coseismic response
Coseismic mechanism
Aquifer
