2019年长宁M6.0和2018年兴文M5.7地震引起的井水位同震响应对比分析

doi:10.12196/j.issn.1000-3274.2020.02.012

Abstract

Abstract: 2019 Changning M6.0 and 2018 Xingwen M5.7 earthquakes caused water level changes in different degrees in eight wells around Huayingshan fault zone. Coseismic water level response in each well were analyzed from the aspects of the seismic wave energy density, coseismic volumetric strain, aquifer permeability change and control of fault zone, in order to find the mechanism of the response of well water level. The results show that the coseismic response amplitude of well water level is related to the energy density of seismic wave. The coseismic response type of water level caused by Changning M6.0 earthquake conforms to the four-quadrant spatial distribution of volumetric strain, but not that of Xingwen M5.7 earthquake. The aquifer permeability changes caused by two earthquakes are spatially inconsistent and anisotropy in each point. The hydrologic conditions of the fault zone have a certain control effect on the coseismic shape and amplitude of water level. As a result, it is concluded that several existing mechanisms cannot fully explain the coseismic response of well water caused by the two earthquakes.

Key words: Well water level, Coseismic response, Huayingshan fault zone, Permeability

CLC Number:

P315.7

XIANG Yang, SUN Xiao-long, YANG Peng-tao, ZHANG Lei, GONG Hao-bo. Comparative Analysis of Coseismic Well Water Level Response Caused by 2019 Changning M6.0 and 2018 Xingwen M5.7 Earthquakes[J]. EARTHQUAKE, 2020, 40(2): 155-165.

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Comparative Analysis of Coseismic Well Water Level Response Caused by 2019 Changning M6.0 and 2018 Xingwen M5.7 Earthquakes

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