陕西凤翔井水位和区域应力场变化与地震活动性关系研究

doi:10.12196/j.issn.1000-3274.2024.03.009

Abstract

Abstract: The northern section of the Longxian-Baoji fault zone has a strong degree of locking, but the locking degree of its southern section is less studied. The observation well of a confined aquifer is considered a sensitive “volumetric strain gauge”, and the rise or fall of the well water level often reflects the state of regional stress in tension or compression. Fengxiang Well in Shaanxi is located in the central and southern section of the Longxian-Baoji Fault. Based on the analysis of the variation trend of the water level in Fengxiang Well from 2013 to 2023, the porosity of the aquifer, the volume compression coefficient of the solid skeleton, and the volume compression coefficient of the water were calculated for the aquifer of the well, under un-drained conditions, by using sliding fits such as the barometric pressure coefficient and the M₂-wave tidal factor. The temporal characteristics of the tectonic stress field around the well were quantitatively analyzed by using the relationship between the water level variation of the well and the vertical stress variation of the aquifer. Based on the GNSS baseline and surface strain variation characteristics within the region, as well as the seismic activity characteristics since 2013, a comprehensive analysis suggests that the stress field variation characteristics in the region can be divided into two stages: ① From 2013 to 2017, the water level of Fengxiang well decreased, and the vertical stress weakened, showing a tensile environment with low seismic frequency. ② From 2017 to 2023, the water level of Fengxiang well tended to stabilize, and the vertical stress fluctuated around zero. The tension weakened and gradually transformed into a stage of stress accumulation and enhancement, with a significant increase in the number of earthquakes. Based on the analysis of the water level, vertical stress, GNSS baseline and surface strain, as well as seismic activity characteristics in the Fengxiang well over the past decade, it can be concluded that the central and southern sections of the Longxian Baoji fault zone is in a relatively stable state with weak stress accumlation and small deformation.

Key words: Fengxiang well, Water level, Stress field, Temporal characteristics, Seismic activity

CLC Number:

P315.7

LIU Jie, ZHAI Hong-guang, ZHANG Guo-qiang, ZHU Lin, QIU Yu-rong. Study on the Relationship between Water Level in Fengxiang Well, Regional Stress Field Change and Seismic Activity in Shaanxi[J]. EARTHQUAKE, 2024, 44(3): 124-137.

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Study on the Relationship between Water Level in Fengxiang Well, Regional Stress Field Change and Seismic Activity in Shaanxi

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