Numerical Computation of a Tsunami Based on a Fault Origin Model of an Earthquake
Numerical Computation of a Tsunami Based on a Fault Origin Model of an Earthquake
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基于地震断层起源模型的海啸数值计算
DOI：
10.4294/zisin1948.27.2_141
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发表时间：
1974
期刊：
影响因子：
--
通讯作者：
I. Aida
中科院分区：
文献类型：
--
作者：
I. Aida
在不大量增加网格数的情况下，建立了一个能充分代表浅海、海湾和外海的数值模式。该数值模式的计算值可直接与湾内验潮站的观测值进行比较。对于1968年的日向大地震，尝试了用地震断层错动计算海啸震源的数值试验。与直接由地震资料导出的震源模型相比，将断层面倾角修正10度左右的震源模型更适合于海啸观测资料。该模式可在5个验潮站再现海啸波，计算波首波峰高度误差为+20，波至时间误差为+0.8min。对海啸传播的振幅变化和方向性以及绿色定律的适用性进行了检验。在细岛地区，在3个地点获得了海啸数据，发现本数值模式在再现短距离内海啸的变化方面是相当可靠的。
Numerical model to represent adequately a shallow water and bay region together with an open sea is constructed without an extreme increase of a number of grids. The computed values in this numerical model may be directly compared with data which are observed by a tide gage at the inside of a bay. As for the 1968 Hyuganada Earthquake, numerical experiments with the tsunami source computed from the dislocation of the earthquake fault are tried. The source model modified by about 10 degrees the dip angle of fault plane is fitter for the observed tsunami data than the one derived directly from seismic data. This model can reproduce the tsunami waves at 5 tide-gage stations in the error of +20 in the height of the first crest of computed waves and of +0.8min in the arrival time. The amplitude variation and the directivity of tsunami propagation, and the applicability of Green's law are examined. At the district of Hososhima, tsunami data are obtained at 3 sites, and it is found that the present numerical model is quite reliable to reproduce the variation of tsunami within a short distance.