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首页> 外文期刊>Nonlinear processes in geophysics >A fault and seismicity based composite simulation in northern California
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A fault and seismicity based composite simulation in northern California

机译：基于断层和地震活动的北加州复合模拟

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We generate synthetic catalogs of seismicity in northern California using a composite simulation. The basis of the simulation is the fault based "Virtual California" (VC) earthquake simulator. Back-slip velocities and mean recurrence intervals are specified on model strike-slip faults. A catalog of characteristic earthquakes is generated for a period of 100 000 yr. These earthquakes are predominantly in the range iM/i = 6 to iM/i = 8, but do not follow Gutenberg-Richter (GR) scaling at lower magnitudes. In order to model seismicity on unmapped faults we introduce background seismicity which occurs randomly in time with GR scaling and is spatially associated with the VC model faults. These earthquakes fill in the GR scaling down to iM/i = 4 (the smallest earthquakes modeled). The rate of background seismicity is constrained by the observed rate of occurrence of iM/i 4 earthquakes in northern California. These earthquakes are then used to drive the BASS (branching aftershock sequence) model of aftershock occurrence. The BASS model is the self-similar limit of the ETAS (epidemic type aftershock sequence) model. Families of aftershocks are generated following each Virtual California and background main shock. In the simulations the rate of occurrence of aftershocks is essentially equal to the rate of occurrence of main shocks in the magnitude range 4 iM/i 7. We generate frequency-magnitude and recurrence interval statistics both regionally and fault specific. We compare our modeled rates of seismicity and spatial variability with observations.
机译：我们使用复合模拟生成了加利福尼亚北部地震活动的综合目录。模拟的基础是基于故障的“虚拟加利福尼亚”（VC）地震模拟器。在模型走滑断层上规定了后滑速度和平均复发间隔。生成了10万年期间的典型地震目录。这些地震主要发生在 M = 6到 M = 8的范围内，但是在较低震级下没有遵循古腾堡-里希特（GR）尺度。为了模拟未映射断层的地震活动性，我们引入了背景地震活动性，它随时间随GR缩放随机发生，并且在空间上与VC模型断层相关。这些地震将GR缩小到 M = 4（模拟的最小地震）。背景地震活动率受加利福尼亚北部观测到的 M M <7范围内的主震发生率。我们生成区域和断层的频率幅度和递归间隔统计信息具体。我们将建模的地震活动率和空间变异率与观测值进行比较。

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