Aquifer Permeability Decreases Before Local Earthquakes Inferred From Water Level Response to Period Loading
Aquifer Permeability Decreases Before Local Earthquakes Inferred From Water Level Response to Period Loading
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DOI：
10.1029/2021gl093856
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发表时间：
2021-07
影响因子：
5.2
通讯作者：
Xiaolong Sun;Y. Xiang
中科院分区：
文献类型：
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作者：
Xiaolong Sun;Y. Xiang
远距离地震引起的动应力引起的渗透率变化已被广泛报道。在较少报道地方地震之前，渗透率就会降低。在这项研究中，我们记录了中国西北部一口名为X11的井地震前含水层渗透率下降的情况。水位对大气压和固体潮汐的响应被用来计算2014年7月至2020年2月期间渗透率的相对变化。结果表明，在2015至2020年间的四次地方地震之前，含水层的渗透率有所下降。我们推断，地震前颗粒沉积引起的裂缝堵塞导致渗透率下降。
Changes of permeability caused by dynamic stress induced by distant earthquakes have been widely reported. Permeability decreases before local earthquakes have been less commonly reported. In this study, we document pre‐earthquake aquifer permeability decreases in a well named X11 in northwest China. The response of the water level to barometric pressure and Earth tides was used to calculate relative changes in permeability between July 2014 and February 2020. The results revealed that there was a decrease in the permeability of the aquifer prior to four local earthquakes between 2015 and 2020. We infer that crack clogging caused by particle deposition causes the permeability decreases before earthquakes.