Unexpected far-field hydrological response to a great earthquake
Unexpected far-field hydrological response to a great earthquake
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大地震的意外远场水文响应
DOI：
10.1016/j.epsl.2019.05.007
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发表时间：
2019-08
影响因子：
5.3
通讯作者：
Ma Yuchuan
中科院分区：
文献类型：
--
作者：
Zhang Yan;Wang Chiyuen;Fu Liyun;Zhao Bo;Ma Yuchuan
渗透性是控制地球浅部地壳中运输过程的重要地壳性质，已知在大地震期间会发生变化，对地下水资源和污染物运输具有重大影响。分析威尔斯井中地下水对地球潮汐的响应已越来越多地用于检测这种变化，但往往有可能对响应变化作出多种解释，因此难以确定其水文影响。在这里，我们使用的数据从地下水井在中国北方，说明使用气压响应作为一种方法来解决这种不确定性。2011年东北远场9.1级大地震后，该井水位的潮汐响应表现出相移和振幅比的同震突然增加，这可以解释为承压含水层水平渗透率的大幅增加，也可以解释为承压含水层垂直渗透率的增加。使用数据的水位对气压的响应，我们表明，含水层是封闭的东北地震之前和之后，因此，同震变化的潮汐响应在这口井更有可能是由于水平渗透率的增加。潮汐响应的解释表明，在地震的远场孔隙弹性性质的变化，这在地震后的104年保持不变，直到淤泥清理在中断的数据收集。因此，东北大地震期间的动态震动可能在震中距离> 1500 km的浅部地壳中引起永久变形。
Permeability, an important crustal property that controls transport processes in Earth's shallow crust, is known to change during large earthquakes, with significant implications on the groundwater resources and contaminant transport. Analysis of the response of groundwater in wells to Earth tides has been increasingly used to detect such changes, but often multiple interpretations of the response changes are possible, making it difficult to ascertain its hydrological implications. Here we use data from a groundwater well in North China to illustrate the use of barometric response as a method to resolve this uncertainty. The tidal response of water level in this well shows abrupt coseismic increases of both phase shift and amplitude ratio after the far-field great 2011 M w 9.1 Tohoku earthquake, which may be interpreted either as a large increase in the horizontal permeability of a confined aquifer or as an occurrence in the vertical permeability of an unconfined aquifer. Using data for the water-level response to barometric pressure we show that the aquifer was confined both before and after the Tohoku earthquake; thus the coseismic changes of the tidal response in this well are more likely to be due to an increase in the horizontal permeability. Interpretation of the tidal response shows a hereto unidentified change of poroelastic property in the far field of an earthquake, which stayed constant for∼ 4 years after the earthquake until silt-cleaning in the well interrupted data collection. Thus the dynamic shaking during the Tohoku earthquake may have caused permanent deformation in the shallow crust at epicentral distances> 1500 km.
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三次大地震远震波引起的井内同震水位变化
影响因子：
2.9
作者：
Zhang Yan;Fu Li-Yun;Huang Fuqiong;Chen Xuezhong
通讯作者：
Chen Xuezhong
影响因子：
5.4
作者：
V. Allègre;E. Brodsky;L. Xue;S. Nale;B. Parker;J. Cherry
通讯作者：
V. Allègre;E. Brodsky;L. Xue;S. Nale;B. Parker;J. Cherry
DOI：
10.1007/978-3-642-00810-8
发表时间：
2010-01
期刊：
--
影响因子：
--
作者：
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通讯作者：
Chi‐yuen Wang;M. Manga
影响因子：
5.8
作者：
Chi‐yuen Wang;Chung-Ho Wang;M. Manga
通讯作者：
Chi‐yuen Wang;Chung-Ho Wang;M. Manga
影响因子：
3
作者：
Yan Zhang;Fu-qiong Huang
通讯作者：
Yan Zhang;Fu-qiong Huang