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首页> 外文期刊>Seismological research letters >Near-Surface Electrical Resistivity Investigation of Coseismic Liquefaction-Induced Ground Deformation Associated with the 2016 M_w 5.8 Pawnee, Oklahoma, Earthquake
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Near-Surface Electrical Resistivity Investigation of Coseismic Liquefaction-Induced Ground Deformation Associated with the 2016 M_w 5.8 Pawnee, Oklahoma, Earthquake

机译：与2016 M_W 5.8 Pawnee，俄克拉荷马，地震相关的电影液化诱导的接地变形的近表面电阻率调查

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The M_w 5.8 Pawnee, Oklahoma, earthquake on 3 September 2016 produced the largest moment release associated with induced seismicity in the southcentral United States. The earthquake ruptured a previously unknown west-northwest-east-southeast-trending left-lateral strike-slip fault, named the Sooner Lake fault (SLF). Unlike the previous earthquakes in Oklahoma, the Pawnee earthquake produced coseismic liquefaction-induced surface deformations including fractures, sand blows, and lateral spreading. In this study, we used high-reso-lution electrical resistivity tomography to image the zones of surface deformation. We also mapped the fracture orientations and compared them with the mainshock and aftershock pattern in the area of the earthquake to elucidate the relationship between the surface deformation and the causative fault. Our results reveal that (l) fractures and sand blow sites are located 2-9 km from the SLF, consistent with patterns of distributed deformation; fracture azimuths vary between 93~°-116~° and 110~°-250~° (subparallel and orthogonal to the 109~° strike of the SLF); (2) sites of sand blow and ground fracture occur within the zone of maximum recorded ground shaking and are underlain by Quaternary alluvial sediments; (3) mega fractures (34 cm wide and up to 226 m long) oriented parallel to river meanders resulted from lateral spreading; and (4) liquefaction sites are underlain by low electrical resistivity (< 10 Ωm) resulting from saturation of vadose zone sediments due to increased pore-water pressure during the earthquake. We conclude that areas underlain by Quaternary alluvial deposits were more susceptible to surface disruption during the earthquake. We suggest that high-resolution geoelectrical imaging is a valuable complementary tool for evaluating areas susceptible to failure during earthquakes and can help with hazard mitigation.
机译：M_W 5.8 Pawnee，俄克拉荷马州，2016年9月3日地震，产生了与诱导诱导的地震性的最大时刻释放。地震破裂了一个以前未知的西北 - 东北趋势左侧防滑断裂，名为宜湖断裂（SLF）。与俄克拉荷马州以前的地震不同，Pawnee地震产生了CoSebicic液化诱导的表面变形，包括裂缝，砂吹和横向扩散。在这项研究中，我们使用了高反应电阻率断层扫描来映射到表面变形的区域。我们还映射了骨折取向，并将其与地震区域中的主轴和余震图案进行了比较，以阐明表面变形与致原因之间的关系。我们的结果表明，（L）裂缝和砂吹围场距离SLF 2-9公里，与分布式变形的图案一致;骨折方位角在93〜°-116〜°和110〜°-250°（SLF的109〜°击中）之间有所不同。 （2）砂吹和地面骨折的遗址发生在最大记录的地面震动区域内，并且由四元加油沉积物下划线; （3）巨型骨折（34厘米宽，长达226米长）与河流蜿蜒达到河流的叶片平行; （4）液化位点通过由于在地震期间增加的孔隙水压力而导致的电阻率低（<10Ωm）下列所引入的低电阻率（<10Ωm）。我们得出结论，在地震期间，季度冲积沉积物下面的区域更容易受到表面破坏。我们建议高分辨率的电气成像是评估地震期间易失效的区域的有价值的互补工具，可以帮助缓解危险。

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