Changes in Groundwater Level Possibly Encourage Shallow Earthquakes in Central Australia: The 2016 Petermann Ranges Earthquake

Changes in Groundwater Level Possibly Encourage Shallow Earthquakes in Central Australia: The 2016 Petermann Ranges Earthquake
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地下水位变化可能引发澳大利亚中部浅层地震:2016 年彼得曼山脉地震

DOI:
10.1029/2018gl080510
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发表时间:
2019-03
影响因子:
5.2
通讯作者:
Jiang Guoyan
Jiang Guoyan
中科院分区:
地球科学1区
文献类型:
--
作者:
Wang Shuai;Xu Wenbin;Xu Caijun;Yin Zhi;Burgmann Rol;Liu Lin;Jiang Guoyan

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偶尔发生在稳定板块中的不寻常的浅源板内地震的机制仍然知之甚少。在这里,我们分析同震和震后位移场与2016年彼得曼山脉地震在澳大利亚中部使用干涉合成孔径雷达数据。这次地震破坏了一个以前未绘制的断层,并在地壳顶部3公里内由高达95厘米的逆冲滑动运动主导。震后变形分析表明,孔隙弹性回弹和后滑的组合是负责观察到的信号。推测的震后滑动与同震破裂在空间上的重叠突出了震后滑动与断裂带周围的孔隙流体流动的耦合。对历史地下水位变化的分析表明,彼得曼山脉周围的浅层地震活动可能是由地下水位波动引起的环境应力扰动引发的;然而,记录这种相关性的统计意义并不容易。
The mechanisms of unusual shallow intraplate earthquakes that occasionally occur in stable cratons remain poorly understood. Here we analyze coseismic and postseismic displacement fields associated with the 2016 Petermann Ranges earthquake in central Australia using interferometric synthetic aperture radar data. The earthquake ruptured a previously unmapped fault and was dominated by thrust slip motion of up to 95 cm within the top 3 km of the crust. Postseismic deformation analysis suggests that a combination of poroelastic rebound and afterslip are responsible for the observed signals. The inferred afterslip overlapping spatially with the coseismic rupture highlights that the postseismic slip is coupled with the pore fluid flow around the fault zones. Analysis of historic groundwater‐level changes suggests that shallow seismicity around the Petermann Ranges may have been triggered by environmental stress perturbations due to the fluctuations of groundwater level; however, it is not easy to document statistical significance of this correlation.
DOI: 10.1016/j.epsl.2012.08.032
发表时间: 2012-12
影响因子: 5.3
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