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Time Reversal Imaging of the Tsunami Source

机译:海啸源的时间反转成像

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In this paper, we apply time reversal imaging (TRI) to the problem of reconstructing the initial sea surface displacement that generates a tsunami. We discuss theoretical considerations in the application of TRI to the tsunami problem, including time reversibility and reciprocity of the shallow-water equations. Several numerical experiments are conducted to establish the efficacy of TRI in the tsunami context. TRI is applied to observations of the tsunami generated by the Tohoku earthquake on March 11, 2011, for which an unprecedented number of high-quality observations are available. Finally, we compare the findings of the TRI results with other, more conventional methods of source inversion. Results indicate that TRI is effective for imaging a tsunami source when a sufficient number of observations are available. Because it involves fewer assumptions about the nature of the tsunami source, in particular those regarding source location and fault geometry, we believe that TRI has the potential to improve our understanding of tsunami generation-for example, through detection of non-seismic components of the tsunami source.
机译:在本文中,我们将时间反转成像(TRI)应用于重建产生海啸的初始海面位移的问题。我们讨论了将TRI用于海啸问题的理论考虑,包括浅水方程的时间可逆性和互易性。进行了一些数值实验以建立TRI在海啸背景下的功效。 TRI适用于2011年3月11日东北地震产生的海啸观测,因此可提供前所未有的高质量观​​测。最后,我们将TRI结果与其他更常规的源反演方法进行了比较。结果表明,如果有足够多的观察结果,TRI可以有效地成像海啸源。由于它涉及的海啸震源性质的假设较少,特别是有关震源位置和断层几何形状的假设,因此我们相信TRI有潜力提高我们对海啸震源的认识,例如,通过检测海啸震源的非地震成分。海啸源。

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