Spatial Variation of Aquifer Permeability in the North China Plain from Large Magnitude Earthquake Signals

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS pure and applied geophysics Pub Date : 2024-06-06 DOI:10.1007/s00024-024-03511-2
Hongbiao Gu, Yirong Xu, Shuangshuang Lan, Mingxin Yue, Mingyuan Wang, Martin Sauter
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Abstract

Permeability changes induced by earthquakes have been studied widely. However, basic questions still remain: what are the spatial differences in permeability changes induced by far-field earthquakes? Is there an inevitable relationship between seismic energy density, epicenter azimuth and permeability change? We try to answer the above questions by examining records of 11 years of groundwater hydrographs of 7 wells in the North China plain at large distance from the epicenters of 221 earthquakes during the period 2008 ~ 2018. The results shows permeability changes varied between the different wells, with the permeability variation of the JN well most sensitively responding to seismic events, while the least sensitive wells being SH, JZ and LK. We found that the azimuths of seismic waves can greatly influence the changes in permeability, i.e. mainly concentrated between 25 and 295°. The seismic density energy (SDE) value larger than approximately 10–9 J/m3 is likely to induce a change in permeability in the NCP aquifer materials. It is found that SDE is not a predictor of permeability change at a given well, by calculating the seismic energy density which did not cause permeability change. While the permeability change ratio before and after the earthquake can be considered as the ability of permeability respond to the dynamic stress and it shows a weak correlation with depth of aquifer. Thus, Factors that probably affect permeability responses changes would have implications for crustal geomechanics.

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从大震信号看华北平原含水层渗透性的空间变化
地震引起的渗透性变化已被广泛研究。然而,基本问题仍然存在:远场地震诱发的渗透率变化在空间上有何差异?地震能量密度、震中方位角与渗透率变化之间是否存在必然联系?我们通过研究 2008~2018 年间华北平原距 221 次地震震中较大距离的 7 口井 11 年的地下水水文图记录,试图回答上述问题。结果表明,不同井的渗透率变化各不相同,其中 JN 井的渗透率变化对地震事件的响应最为敏感,而 SH、JZ 和 LK 井的渗透率变化对地震事件的响应最不敏感。我们发现地震波的方位角对渗透率的变化有很大影响,即主要集中在 25 至 295°之间。地震密度能(SDE)值大于约 10-9 J/m3 时,可能会引起 NCP 含水层材料渗透率的变化。通过计算未引起渗透率变化的地震能量密度,发现 SDE 并不能预测特定井的渗透率变化。而地震前后的渗透率变化比可视为渗透率对动态应力的响应能力,它与含水层深度的相关性较弱。因此,可能影响渗透性响应变化的因素将对地壳地质力学产生影响。
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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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