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Cross-Diffusion Waves as a trigger for multiscale, multiphysics Instabilities: Application to earthquakes
Solid Earth ( IF 3.2 ) Pub Date : 2020-09-29 , DOI: 10.5194/se-2020-149 Klaus Regenauer-Lieb , Manman Hu , Christoph Schrank , Xiao Chen , Santiago Peña Clavijo , Ulrich Kelka , Ali Karrech , Oliver Gaede , Tomasz Blach , Hamid Roshan , Antoine B. Jacquey , Piotr Szymczak
Solid Earth ( IF 3.2 ) Pub Date : 2020-09-29 , DOI: 10.5194/se-2020-149 Klaus Regenauer-Lieb , Manman Hu , Christoph Schrank , Xiao Chen , Santiago Peña Clavijo , Ulrich Kelka , Ali Karrech , Oliver Gaede , Tomasz Blach , Hamid Roshan , Antoine B. Jacquey , Piotr Szymczak
Abstract. Theoretical approaches to earthquake instabilities propose shear-dominated instabilities as a source mechanism. Here we take a fresh look at the role of possible volumetric instabilities preceding a shear instability. We investigate the phenomena that may prepare earthquake instabilities using the coupling of Thermo-Hydro-Mechano-Chemical reaction-diffusion equations in a THMC diffusion matrix. We show that the off-diagonal cross-diffusivities can give rise to a new class of waves known as cross-diffusion waves. Their unique property is that for critical conditions cross-diffusion waves can funnel wave energy into a quasi-stationary wave focus from large to small-scale. The equivalent extreme event in ocean waves and optical fibres leads to the appearance of
中文翻译:
交叉扩散波引发多尺度,多物理场不稳定性:在地震中的应用
摘要。地震失稳的理论方法提出以剪切力为主的失稳为震源机制。在这里,我们重新审视了剪切不稳定性之前可能存在的体积不稳定性的作用。我们使用THMC扩散矩阵中的热-水力-化学-化学反应扩散方程来研究可能造成地震不稳定的现象。我们证明了非对角交叉扩散会引起一类称为交叉扩散波的新波。它们的独特特性是,在临界条件下,交叉扩散波可以将波能集中到从大到小的准平稳波焦点。海浪和光纤中的等效极端事件导致
更新日期:2020-09-29
rogue wavesand high energy pulses of light in lasers. In the context of hydromechanical coupling, a rogue wave would appear as a sudden fluid pressure spike on the future fault plane. This is here interpreted as a trigger for the ultimate (shear) seismic moment release.
中文翻译:
交叉扩散波引发多尺度,多物理场不稳定性:在地震中的应用
摘要。地震失稳的理论方法提出以剪切力为主的失稳为震源机制。在这里,我们重新审视了剪切不稳定性之前可能存在的体积不稳定性的作用。我们使用THMC扩散矩阵中的热-水力-化学-化学反应扩散方程来研究可能造成地震不稳定的现象。我们证明了非对角交叉扩散会引起一类称为交叉扩散波的新波。它们的独特特性是,在临界条件下,交叉扩散波可以将波能集中到从大到小的准平稳波焦点。海浪和光纤中的等效极端事件导致
流氓波的出现和激光中的高能量脉冲。在流体力学耦合的情况下,流浪将作为未来故障平面上的突然的流体压力峰值出现。在这里,这被解释为最终(剪切)地震力矩释放的触发。