Co-seismic Water Level and Temperature Responses of Some Wells to Far-Field Strong Earthqu

Co-seismic Water Level and Temperature Responses of Some Wells to Far-Field Strong

Earthquakes and Their Mechanisms

佚名

【期刊名称】《中国地震研究（英文版）》 【年(卷),期】2007(021)003

【摘要】The observation of water temperature in deep wells has been carried out for more than 20 years in China. However, study on the mechanism of water temperature response to earthquakes is inadequate. During the study of the co-seismic response characteristics of water level and temperature in 121 wells within the China subsurface fluid monitoring network at the time of the December 26, 2004, Ms8.7 Indonesia earthquake, we found regular response characteristics, that is, when the water level in a deep well oscillates, the water temperature in the same well will mostly experience a cycle from dropping to restoration at the same time. The process will continue for dozens of minutes to several hours. In order to confirm the observed phenomenon, we collected the digital water level and temperature observation data for 39 farfield strong earthquakes from the Tangshan well in Hebei Province (with the data set beginning in 2001). The same response characteristics were observed. Based on the analysis of the influencing factors that may cause the water temperature drop, the