Coseismic effects of water temperature based on digital observation from Tayuan well, Beijing

Abstract

On the basis of digital records from Tayuan well, we study coseismic effects of water temperature caused by remote earthquakes. The records show that the water temperature changes are consistently following the process of drop-rise-recovery regardless of focal mechanism or epicentral directions. The step amplitude of water temperature increases with the increase of earthquake magnitude, and decreases with the decrease of epicentral distances. They have rather well correlation. Water temperature rising after earthquake is influenced by water level variations. Finally, the mechanisms of coseismic effects of water temperature have been discussed. Preliminary study shows that accelerated convection and mixing of different temperature water in virtue of seismic wave are the main causes of water temperature drops. Seismic wave accelerates water convection, which causes warm water to move up from deeper part of the well and cold water to go down from the upper part. Temperature probe will detect water temperature drops at early stage. After the occurrence of earthquake, as the fluctuation of water level gradually quiets down, water temperature near the probe begins to rise.

Advances in research on earthquake fluids hydrogeology in China: a review

“…By means of finite element modeling, Shi et al (2007) studied the responses of water temperature in the Tangshan well to several quakes, and concluded that the diffusion effect by vertical oscillation of well water is responsible for co-seismic change of water temperature. From the study of co-seismic response of water temperature in the digitalized Tayuan well of Beijing to earthquakes during 2000, Yang et al (2007 noted that each response was a decline first, and a rising afterwards, and its amplitude is well correlated with the magnitude and distance of the event. Thus, they suggest that the change of water temperature in this well can be attributed to upwelling of warm water from depth and the falling of cold water at upper levels.…”

Fluctuation Characteristics of Water Level and Water Temperature of Huize Well Based on MF-DCCA

“…The Earthquake Cases of China recorded that, at the time of the 2004 M8.7 Sumatra earthquake, the water level of 78 wells and the water temperature of 59 wells in China showed co-seismic changes [1]. After researching the coseismic response mechanism of water level and water temperature of the Tayuan Well in Beijing during multiple earthquakes, scholars Yang et al [2] believe that in the coseismic response, the convection and mixing of the water body in the well are the causes of the water temperature drop. Shi et al [3] studied the co-seismic water level and water temperature changes of the Tangshan Mine Well during 11 earthquakes of magnitude 7.0 or above in 2004, and found that when the well water was vertically oscillated, the disturbed well water triggered a dispersion effect and resulted in changes in the water temperature.…”

Post-Earthquake Water Quality in Bhaktapur District, Nepal

“…Massive earthquakes may cause crack in the rocksand facilitate in leaching of metallic ions to groundwater aquifer. This can change physical characteristics and chemical composition of water (Esposito et al, 2001;Hsu, Tung, 2004;Yang et al, 2007;Sato et al, 2014;Banjara, Paudel, 2017). Similarly, groundwater level also alters with equal possibility of formation and disappearance of new springs depending on the strength of quake and geological formation of earthquake affected area (Chia et al, 2001;Matsumoto et al, 2003).…”