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Supershear Rupture Under Hydrostatic Pressure Condition
Strength of Materials ( IF 0.7 ) Pub Date : 2020-11-09 , DOI: 10.1007/s11223-020-00201-x
H. Cheng , X. P. Zhou , J. Bi , F. Berto

The effects of friction coefficient, stress drop ratio, the ratio of residual strength to initial stress, and the dip angle of faults on the rupture velocity under hydrostatic pressure condition, as well as the stress distribution on the fault, are investigated using General Particle Dynamics code. The numerical results indicate three distinct regimes of rupture dynamics: (i) slow rupture, (ii) sub-Rayleigh rupture, and (iii) supershear rupture. This suggests that rupture-mode selection is coupled to friction coefficient, stress drop ratio, the ratio of residual strength to initial stress, and the dip angle of faults. Moreover, supershear rupture can occur under upper-crustal (< 250 MPa), lower-crustal (250 to 1000 MPa), and upper-mantle (1000 to 10000 MPa) conditions. Since rupture velocity is fastest under upper-crustal conditions, supershear rupture most easily occurs under these condition.



中文翻译:

静水压力条件下的超剪切破裂

使用通用粒子动力学研究了摩擦系数,应力下降比,残余强度与初始应力之比以及断层的倾角对静水压条件下破裂速度以及断层上应力分布的影响。码。数值结果表明了三种不同的破裂动力学机制:(i)慢速破裂,(ii)亚瑞利破裂,和(iii)超剪切破裂。这表明断裂模式的选择与摩擦系数,应力下降比,残余强度与初始应力之比以及断层倾角有关。此外,在上地壳(<250 MPa),下地壳(250至1000 MPa)和上地幔(1000至10000 MPa)条件下会发生超剪切断裂。由于在上地壳条件下破裂速度最快,

更新日期:2020-11-09
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