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首页> 外文期刊>Pure and Applied Geophysics >Dynamic Rupture and Seismic Radiation in a Damage-Breakage Rheology Model
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Dynamic Rupture and Seismic Radiation in a Damage-Breakage Rheology Model

机译：损伤破坏流变模型中的动态破裂和地震辐射

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摘要

We present simulations of dynamic ruptures in a continuum damage-breakage rheological model and waves radiated by the ruptures and observed in the far field. The propagating rupture produces rock damage and granulation in the process zone ahead of the rupture front. An expansion-compaction process in the process zone leads to an isotropic source term, while shear motion that accumulates behind the propagating front produces a deviatoric source term and shear heating behind the rupture front. The process zone dissipation due to the damage-breakage mechanism, and the isotropic source component, significantly affect the S/P energy partitioning and the radiation patterns of the waves. The calculated S/P seismic energy ratio can be significantly lower than results of standard models with no damage-breakage mechanism and no source volume components. The P radiation pattern becomes more isotropic compared with the classical deviatoric solution, with increased lobes at 45 degrees to the direction of rupture propagation. The S radiation pattern is affected more strongly by the damage-breakage process in the source volume, mainly within the process zone, and is significantly different from classical deviatoric results. The S waves propagate from the rupture front through the process zone (unlike the P waves), experiencing stronger dissipation, so the S radiation pattern is more affected than the P radiation pattern. Hence, analysis of P waves can provide more reliable results on rupture directivity than S waves.
机译：我们在远场辐射的连续损伤流变模型和波浪中的动态破裂模拟并在远场观察。传播破裂在破裂前方的过程区域中产生岩石损伤和造粒。过程区域中的扩展压缩过程导致各向同性源期限，而蓄积在传播前部的剪切运动会产生偏差源期和剪切加热在破裂前面。由于损伤机构和各向同性源部件而导致的过程区耗散，显着影响了波的S / P能量分区和波浪的辐射图案。计算出的S / P地震能量比可以显着低于标准模型的结果，没有损坏 - 破坏机构，没有源体积分量。与经典脱离溶液相比，P辐射模式变得更加各向同性，并且在45度以破裂繁殖方向增加了45度的裂片。 S辐射图案受到源体积中的损伤过程更强烈地影响，主要在过程区域内，与经典偏离的结果显着不同。 S波通过处理区的破裂前沿传播（与P波不同），经历更强的耗散，因此S辐射图案比P辐射图案更受影响。因此，对P波的分析可以提供比S波的破裂方向性的更可靠的结果。

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