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首页> 外文会议>World conference on earthquake engineering;WCEE >AN INVERSION METHOD TO DETERMINE STRESS DISTRIBUTIONON A FAULT PLANE USING GROUND MOTIONS
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AN INVERSION METHOD TO DETERMINE STRESS DISTRIBUTIONON A FAULT PLANE USING GROUND MOTIONS

机译：利用地面运动确定断层应力分布的反演方法

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The rupture process of an earthquake has large effect on near-field ground motions. Because source-timefunctions are affected by the stress drop process, it is important to understand the dynamic rupture processof earthquake faults to estimate near-field ground motions. Kinematic inversion analyses have beencarried out to obtain spatiotemporal slip distributions, from which the stress distributions on the faultplane have been inferred. In this study, an inversion method to infer stress drop process of an earthquakefault is developed. To express a spatiotemporal stress distribution on an earthquake fault during anearthquake, a fault is divided into subfaults and the shear stress on a subfault after the passage of therupture front is assumed to change repeatedly to its residual stress. Stress changes of subfaults are inferreddirectly from the observed ground motions. Total rupture processes are composed of the stress changehistories of the subfaults. To examine the performance of the method, a simulation test was conducted. Arelatively simple model was used in the simulation and the computed synthetics were used as observedseismograms. The inversion was stabilized by adding smoothing constraints and ABIC was employed toobjectively determine the optimal values of hyperparameters. The inferred time histories of stress changeson subfaults fit generally well with the assumed rupture process.
机译：地震的破裂过程对近场地震动有很大的影响。由于震源-时间函数受应力下降过程的影响，因此了解地震断层的动态破裂过程以估计近场地震动非常重要。进行了运动学反演分析以获得时空滑移分布，从中可以推断出断层面上的应力分布。在这项研究中，开发了一种反演方法来推断地震断层的应力下降过程。为了表示地震过程中地震断层的时空应力分布，将断层划分为子断层，并假定破裂前沿通过后，子断层上的剪应力反复变化为其残余应力。从观测到的地震动可以直接推断出子断层的应力变化。总断裂过程由子断裂的应力变化历史组成。为了检查该方法的性能，进行了模拟测试。在模拟中使用了相对简单的模型，并且将计算出的合成物用作观测地震图。通过添加平滑约束来稳定反演，并采用ABIC客观地确定超参数的最佳值。推断的亚断层应力变化的时间历史通常与假定的破裂过程非常吻合。

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