Nonlinear Earthquake Response of Marine Sediments With Distributed Acoustic Sensing

Nonlinear Earthquake Response of Marine Sediments With Distributed Acoustic Sensing
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分布式声学传感海洋沉积物的非线性地震响应

DOI:
10.1029/2022gl100122
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发表时间:
2022
影响因子:
5.2
通讯作者:
Shinohara, Masanao
Shinohara, Masanao
中科院分区:
地球科学1区
文献类型:
--
作者:
Viens, Loïc;Bonilla, Luis Fabian;Spica, Zack J.;Nishida, Kiwamu;Yamada, Tomoaki;Shinohara, Masanao

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松软的沉积层可以显著放大地震产生的地震波。大的动应变可以引起低强度浅层土的非线性响应,其特征是共振频率的移动、地面运动的衰减,在某些情况下,还会引起土的液化。我们利用分布式声学传感技术(DAS)研究了日本东北地区近海光缆记录的地震地面运动过程中海洋沉积物的响应。计算了105个不同频段地震的自相关函数。我们检测到ACF波形中的时间延迟,这些时间延迟被转换为相对速度变化(dv/v)。表征土壤非线性的dv/v水滴在最强烈的地面运动期间被观察到,并且沿电缆表现出很大的变异性。这项研究表明,DAS可以用来以前所未有的空间分辨率推断浅层地球的动力学性质。
Soft sediment layers can significantly amplify seismic waves from earthquakes. Large dynamic strains can trigger a nonlinear response of shallow soils with low strength, which is characterized by a shift of resonance frequencies, ground motion deamplification, and in some cases, soil liquefaction. We investigate the response of marine sediments during earthquake ground motions recorded along a fiber‐optic cable offshore the Tohoku region, Japan, with distributed acoustic sensing (DAS). We compute AutoCorrelation Functions (ACFs) of the ground motions from 105 earthquakes in different frequency bands. We detect time delays in the ACF waveforms that are converted to relative velocity changes (dv/v).dv/vdrops, which characterize soil nonlinearity, are observed during the strongest ground motions and exhibit a large variability along the cable. This study demonstrates that DAS can be used to infer the dynamic properties of the shallow Earth with an unprecedented spatial resolution.
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