Spontaneous rupture simulations along geometrically rough faults have been shown to produce realistic far‐field spectra and comparable fits with ground motion metrics such as spectral accelerations and peak motions from Ground Motion Prediction Equations (GMPEs), but they are too computationally demanding for use with physics‐based probabilistic seismic hazard analysis efforts. Here, we present our implementation of a kinematic rupture generator that matches the characteristics of, at least in a statistical sense, rough‐fault spontaneous rupture models. To this end, we analyze ~100 dynamic rupture simulations on strike‐slip faults with M_w ranging from 6.4 to 7.2. We find that our dynamic simulations follow empirical scaling relationships for strike‐slip events and provide source spectra comparable to a source model with ω⁻² decay. To define our kinematic source model, we use a regularized Yoffe function parameterized in terms of slip, peak‐time, rise‐time, and rupture initiation time. These parameters are defined through empirical relationships with random fields whose one‐ and two‐point statistics are derived from the dynamic rupture simulations. Our rupture generator reproduces Next Generation Attenuation (NGA) West2 GMPE medians and intraevent standard deviations of spectral accelerations with periods as short as 0.2 s for ensembles of ground motion simulations. Our rupture generator produces kinematic source models for M6.4–7.2 strike‐slip scenarios that can be used in broadband physics‐based probabilistic seismic hazard efforts or to supplement data in areas of limited observations for the development of future GMPEs.

中文翻译：

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基于3D自发破裂模拟的运动破裂发生器

沿几何粗糙断层的自发破裂模拟已经显示出可以产生逼真的远场谱，并且可以与地面运动指标（例如，来自地面运动预测方程（GMPE）的谱加速度和峰值运动）进行拟合，但是在物理上对计算的要求很高基于概率的地震灾害分析工作。在这里，我们介绍一种运动破裂发生器的实现，该发生器至少在统计意义上与粗糙故障自发破裂模型的特征相匹配。为此，我们分析了具有M _w的走滑断层的约100个动态破裂模拟。从6.4到7.2。我们发现，我们的动态模拟遵循了走滑事件的经验比例关系，并提供了与具有ω ^-2衰减的源模型相当的源光谱。为了定义运动学源模型，我们使用根据滑移，峰值时间，上升时间和破裂起始时间参数化的正则化Yoffe函数。这些参数是通过与随机字段的经验关系来定义的，这些随机字段的一点和两点统计信息来自动态破裂模拟。我们的破裂发生器再现了下一代衰减（NGA）West2 GMPE的中值和频谱加速度的事件内标准偏差，周期短至0.2 s，适合进行地面运动模拟。我们的破裂发生器产生运动学​​模型，用于M 6.4–7.2走滑情景可用于基于宽带物理学的概率地震灾害工作，或补充观测资料有限的地区的数据，以开发未来的GMPE。