Linear and nonlinear computations of the 1992 Nicaragua earthquake tsunami
Linear and nonlinear computations of the 1992 Nicaragua earthquake tsunami
复制标题
1992 年尼加拉瓜地震海啸的线性和非线性计算
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
K. Satake
中科院分区：
文献类型：
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作者：
K. Satake
利用不同的控制方程、底摩擦值和测深资料，对1992年尼加拉瓜地震的海啸进行了数值计算。结果相互比较，并与观测值进行了比较，包括验潮仪记录和试车高度。对观测到的海啸波形和计算的海啸波形的比较表明，在海啸计算中使用小网格的详细水深数据比在海啸计算中包括非线性项更有效。线性计算高估了比第一个到达更晚的相位的幅度，特别是当幅度变大时。由非线性计算得到的沿海岸的振幅远小于观测到的海啸上升高度；在目前的情况下，当使用1分钟的网格尺寸时，平均比率或放大系数估计为3。但是，该系数可能取决于计算的网格大小。
Numerical computations of tsunamis are made for the 1992 Nicaragua earthquake using different governing equations, bottom frictional values and bathymetry data. The results are compared with each other as well as with the observations, both tide gauge records and runup heights. Comparison of the observed and computed tsunami waveforms indicates that the use of detailed bathymetry data with a small grid size is more effective than to include nonlinear terms in tsunami computation. Linear computation overestimates the amplitude for the later phase than the first arrival, particularly when the amplitude becomes large. The computed amplitudes along the coast from nonlinear computation are much smaller than the observed tsunami runup heights; the average ratio, or the amplification factor, is estimated to be 3 in the present case when the grid size of 1 minute is used. The factor however may depend on the grid size for the computation.