Aquifers switched from confined to semiconfined by earthquakes
Aquifers switched from confined to semiconfined by earthquakes
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地震使含水层从封闭状态转变为半封闭状态
DOI：
10.1002/2016gl070937
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发表时间：
2016
影响因子：
5.2
通讯作者：
Guangcai Wang
中科院分区：
文献类型：
--
作者：
Zheming Shi;Guangcai Wang
地震引起的含水层参数变化（例如，渗透率和水力扩散率）已经在许多研究中被记录。然而，地震后含水层的封闭性从封闭到封闭的变化还没有被报道过。这里我们关注2008年汶川7.9级地震和2013年芦山6.6级地震后四口威尔斯井水位的潮汐响应，以表明地震可以通过重新打开先前存在的垂直裂缝（以及后来的愈合）将封闭含水层改变为封闭含水层。这项研究具有重要意义，因为从封闭到封闭的转换意味着垂直水力连接的变化，这可能会影响含水层的脆弱性，地下废物库的完整性和地下水供应的安全。
Earthquake-induced aquifer parameter changes (e.g., permeability and hydraulic diffusivity) have been documented in many studies. However, changes in the confinement of an aquifer from confined to semiconfinedfollowinganearthquakehavenotbeenreported.Herewefocusonthe tidal response of the water.level in four wells following the 2008 Wenchuan Mw 7.9 and 2013 Lushan Mw 6.6 earthquakes to show that earthquakes can change confined aquifers to semiconfined aquifers by reopening of preexisting vertical fractures (and later healing). This study has important implications because a switch from confined to semiconfined means a change of vertical hydraulic connection, whichmayaffect the vulnerability of an aquifer, the integrity of underground waste repositories, and the safety of groundwater supplies.