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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Stress- and aftershock-constrained joint inversions for coseismic and postseismic slip applied to the 2004 M6.0 Parkfield earthquake
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Stress- and aftershock-constrained joint inversions for coseismic and postseismic slip applied to the 2004 M6.0 Parkfield earthquake

机译：同震和后震滑动的应力和余震约束联合反演应用于2004年M6.0帕克菲尔德地震

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[1] Both aftershocks and geodetically measured postseismic displacements are important markers of the stress relaxation process following large earthquakes. Postseismic displacements can be related to creep-like relaxation in the vicinity of the coseismic rupture by means of inversion methods. However, the results of slip inversions are typically non-unique and subject to large uncertainties. Therefore, we explore the possibility to improve inversions by mechanical constraints. In particular, we take into account the physical understanding that postseismic deformation is stress-driven, and occurs in the coseismically stressed zone. We do joint inversions for coseismic and postseismic slip in a Bayesian framework in the case of the 2004 M6.0 Parkfield earthquake. We perform a number of inversions with different constraints, and calculate their statistical significance. According to information criteria, the best result is preferably related to a physically reasonable model constrained by the stress-condition (namely postseismic creep is driven by coseismic stress) and the condition that coseismic slip and large aftershocks are disjunct. This model explains 97% of the coseismic displacements and 91% of the postseismic displacements during day 1-5 following the Parkfield event, respectively. It indicates that the major postseismic deformation can be generally explained by a stress relaxation process for the Parkfield case. This result also indicates that the data to constrain the coseismic slip model could be enriched postseismically. For the 2004 Parkfield event, we additionally observe asymmetric relaxation process at the two sides of the fault, which can be explained by material contrast ratio across the fault of ～ 1.15 in seismic velocity.
机译：[1]余震和大地测量的地震后位移都是大地震后应力松弛过程的重要标志。后地震位移可以通过反演方法与同震破裂附近的蠕变状松弛有关。但是，转差反演的结果通常是不唯一的，并且存在很大的不确定性。因此，我们探索了通过机械约束来改善反演的可能性。特别是，我们考虑到物理上的理解，即地震后变形是应力驱动的，并且发生在同震应力区域。在2004年M6.0帕克菲尔德地震的情况下，我们在贝叶斯框架中对同震和后震滑动进行联合反演。我们执行许多具有不同约束条件的反演，并计算其统计意义。根据信息标准，最好的结果最好与受应力条件约束的物理合理模型有关（即，后震蠕变是由同震应力驱动的），而同震滑动和大余震的条件是分离的。该模型分别解释了在Parkfield事件发生后的第1-5天，同震位移的97％和震后位移的91％。这表明主要的地震后变形可以用帕克菲尔德案例的应力松弛过程来概括。该结果还表明，约束同震滑动模型的数据可以在震后丰富。对于2004年的Parkfield事件，我们还观察到了断层两侧的不对称弛豫过程，这可以用地震速度上约1.15的断层上的物质对比度来解释。

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