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首页> 外文期刊>Pure and Applied Geophysics >Rapidness and Robustness of Finite-Source Inversion of the 2011 M-w 9.0 Tohoku Earthquake by an Elliptical-Patches Method Using Continuous GPS and Acceleration Data
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Rapidness and Robustness of Finite-Source Inversion of the 2011 M-w 9.0 Tohoku Earthquake by an Elliptical-Patches Method Using Continuous GPS and Acceleration Data

机译：使用连续GPS和加速度数据的椭圆形补丁方法对2011 M-w 9.0东北地震有限源反演的快速性和鲁棒性

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摘要

The kinematic rupture process of the 2011 M-w 9.0 Tohoku earthquake is inverted with an elliptical-patches method, using a genetic algorithm, for the purpose of rapid and robust estimation of the source parameters of a mega-earthquake. We use the ground-displacement field provided by a continuous GPS network and the ground-velocity field recorded by acceleration networks. In addition to the typical inversion procedure in which a data duration long enough to cover the whole rupture process is used, inversions based on shorter signals, giving an incomplete view over the ground shaking sequence, are also carried out. How fast can a robust estimation of the source parameters be obtained? Using the elliptical approximation, we find that robust solutions of M-w similar to 9.0-earthquakes are rather quickly obtained regardless of the frequency band and the elliptical patch description. It is also confirmed that, because of the absence of off-shore recording stations on the east side of the fault, some uncertainties in the rupture process cannot be completely removed. In fact, at the very low frequencies considered, the western part of the fault (deeper portion) contributes more significantly to the recorded signals than does the other end close to the trench. This problem also prevents refinement of the description of the rupture process, in particular when using more than one ellipse.
机译：为了快速，可靠地估计特大地震的震源参数，采用遗传算法，采用椭圆形斑块方法将2011年东北9.0级东北地震的运动破裂过程进行了倒转。我们使用连续GPS网络提供的地面位移场和加速度网络记录的地面速度场。除了典型的反演程序（其中使用的数据持续时间足以覆盖整个破裂过程）外，还执行了基于较短信号的反演，从而无法完整了解地面震动序列。可以快速获得源参数的可靠估计吗？使用椭圆近似，我们发现，无论频带和椭圆形块描述如何，都可以很快获得类似于9.0级地震的M-w鲁棒解。还可以确定的是，由于断层东侧没有离岸记录台，因此无法完全消除破裂过程中的一些不确定性。实际上，在考虑的极低频率下，断层的西部（较深的部分）对记录信号的贡献要比靠近沟槽的另一端大。这个问题也妨碍了对破裂过程的描述的改进，特别是当使用多个椭圆形时。

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