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On the importance of 3D stress state in 2D earthquake rupture simulations with off-fault deformation

Louise Jeandet RibesMarion Y. ThomasHarsha S. Bhat
Dec 2022
摘要
During the last decades, many numerical models have been developed toinvestigate the conditions for seismic and aseismic slip. Those models explorethe behavior of frictional faults, embedded in either elastic or inelasticmediums, and submitted to a far field loading (seismic cycle models), orinitial stresses (single dynamic rupture models). Those initial conditionsimpact both on-fault and off-fault dynamics. Because of the sparsity of directmeasurements of fault stresses, modelers have to make assumptions about theseinitial conditions. To this day, Anderson's theory is the only framework thatcan be used to link fault generation and reactivation to the three-dimensionalstress field. In this work we look at the role of the three dimensional stressfield in modelling a 2D strike-slip fault under plane-strain conditions. Weshow that setting up the incorrect initial stress field, based on Anderson'stheory, can lead to underestimation of the damage zone width by up to a factorof six, for the studied cases. Moreover, because of the interactions betweenfault slip and off-fault deformation, initial stress field influences therupture propagation. Our study emphasizes the need to set up the correctinitial 3D stress field, even in 2D numerical simulations.
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