Ultrafast ultrasound captures dynamic rupture behavior
Ultrafast ultrasound captures dynamic rupture behavior
复制标题
超快超声波捕捉动态破裂行为
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
C. Voisin
中科院分区：
文献类型：
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作者：
J. Aichele;S. Catheline;P. Roux;S. Latour;C. Voisin
我们应用剪切波弹性成像，这是一种使用超快超声波来分析破裂成核的医学成像技术。为了更好地了解导致地震成核的摩擦和破裂过程，我们建立了一个实验室实验，重现软弹性材料地震断层的粘滑行为。通过与超声采集系统同步的电机控制驱动板来产生破裂过程。与断层上的粗糙体类似，一小块沙粒构成了粘滑行为。与经典地震学方法相比，我们能够跟踪样本内的波传播，从而高度解析弹性波场的近项和中间项。第一个结果证实了先前证明的面内剪切模式的超剪切和亚瑞利前沿的存在。我们分析了断层上的破裂速度分布并解决了粗糙体的延伸......
We apply shear wave elastography, a medical imaging technique that uses ultrafast ultrasound to analyze rupture nucleation. In order to better understand friction and rupture processes which are responsible for earthquake nucleation, we build a laboratory experiment that reproduces the stick-slip behavior of a seismic fault for soft elastic materials. The rupture process is generated by controlling a driving slab through a motor in synchronization with the ultrasound acquisition system. As an analog to an asperity on a fault, a patch of sand grains constitutes the stick-slip behavior. In contrast to classical seismological methods, we are able to follow the wave propagation inside the sample and thus highly resolve the near and intermediate terms of the elastic wave-field. First results confirm the previously proven existence of super-shear as well as sub-Rayleigh fronts for the in-plane shearing mode. We anlayze the rupture speed distribution on the fault and resolve the extension of the asperity as well...