利用海啸数值模拟结果进行海底地震有限断层模型验证

基于地震有限断层模型进行海啸的数值模拟通常被用来估计海啸的到时、 波高等, 另一方面, 海啸数值模拟的结果也可以作为限定条件用来考察同一地震的不同断层模型之间的相对合理性。 采用国际上各地震研究机构在震后各自得出的不同的有限断层模型作为海啸源, 使用基于二维浅水波方程的海啸传播模型对2011年日本东北地震海啸的传播过程进行模拟, 以海啸模拟所得到的沿岸浪高分布、 平均波高、 最大波高等与实际观测值相比较, 进而判断由各有限断层模型所计算得到的海啸中哪个结果与实际的海啸情况更为符合, 由此推断断层模型的相对合理性。

Tsunami Constraints on Finite Fault Models:the March 11, 2011 Tohoku Earthquake

Numerical simulation of tsunami is currently utilized to estimate the arrival time, amplitude and wave length information of the tsunami; it can also provide abundant constraints to investigate the inversion results of the earthquake rapture processes. Our tsunami models based on two-dimension shallow water equations are proposed to study the tsunami propagation characteristics of the March 11, 2011 Tohoku earthquake, Japan. The overall distribution of tsunami along the coast line, average wave height, and the maximum tsunami and location are obtained from our numerical calculations and are compared with the observation data available. It is found that among the different rupture models from several seismological agencies, most of them could approximately match the features of the tsunami distribution. One of our interesting discoveries is that the simple average dislocation model can produce a closer average value of wave height with the observed results.