Coseismic water-level changes in a well induced by teleseismic waves from three large earthquakes

Coseismic water-level changes in a well induced by teleseismic waves from three large earthquakes
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三次大地震远震波引起的井内同震水位变化

DOI:
10.1016/j.tecto.2015.02.027
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发表时间:
2015-05
期刊:
影响因子:
2.9
通讯作者:
Chen Xuezhong
Chen Xuezhong
中科院分区:
地球科学2区
文献类型:
--
作者:
Zhang Yan;Fu Li-Yun;Huang Fuqiong;Chen Xuezhong

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2007年苏门答腊Mw8.4、2008年汶川Mw7.9和2011年东北Mw9.0大地震在中国东北部阜新市的阜新井(水位和体应变观测井)引起远场(震中距离> 1000 km)的同震水位增加。通过对现场渗透率、Skempton系数B的分析,结合附近台站的宽频带地震记录,对远场同震水位变化的机理进行了综合分析。我们观察到一个不排水压实与减少渗透率引起的振动的地震波在远场。地震波的震动可以引起富新井含水层的压实或膨胀,提高渗透率,从而在富新井与邻近的寺河水库(距富新井150 m)之间建立一个新的孔隙压力平衡系统。由此产生的间隙流体流经该区域,增加了阜新井含水层的同震水位。
Three large earthquakes (the 2007Mw8.4 Sumatra, the 2008Mw7.9 Wenchuan, and the 2011Mw9.0 Tohoku) induce coseismic water-level increment at far fields (epicentral distances > 1000 km) in the Fuxin well located in the Fuxin City, northeastern China (the well with the observation of both water levels and volume strains). A comprehensive analysis for the mechanism of far-field coseismic water-level changes is performed by analyzing the in-situ permeability, Skempton's coefficientB, and with the broadband seismograms from a nearby station. We observe an undrained compaction with a decreasing permeability induced by the shaking of teleseismic waves in the far field. Shaking by teleseismic waves can induce compaction or dilatation in the aquifer of Fuxin well; is able to enhance permeability and thus build a new pore-pressure equilibrium system between the Fuxin well and the nearby Sihe reservoir (150 m away from the Fuxin well). The resulting interstitial fluid flow across the region increases coseismic water levels in the aquifer of Fuxin well.
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