2018-01-23阿拉斯加海啸的数值模拟研究

Numerical Simulation Study of Alaska Tsunami

利用Okada模型计算2018-01-2309:31(UTC)阿拉斯加湾7.9级地震引发的海啸的初始场信息,利用COMCOT模型模拟海啸传播。比较海啸首波振幅和到达时间模拟值与实测值显示,振幅差异在4cm以内,时间差异在4min以内。模拟结果与观测资料吻合,揭示阿拉斯加地震引发的海啸强度弱,同时反映海啸初始场参数的选择合理有效,海啸模拟计算结果真实可靠。

On January 23,2018,a 7.9-magnitude earthquake occurred in the gulf of Alaska.The Okada model is used to calculate the initial tsunami field information,and the COMCOT model is used to simulate the tsunami propagation.The simulated amplitude and arrival time of the tsunami wave are compared with the measurements at the DARTs station.The amplitude difference is within 4 cm,and the time difference is within 4 minutes;furthermore,the simulation results agree with the measurements,which reveals that the intensity of the tsunami caused by the Alaska earthquake is weak and reflects that the selection of the parameters of the initial tsunami field is reasonable and effective.Also,the results of tsunami simulation are reliable.