Место издания:Tokyo Institute of Technology, Japan Tokyo Institute of Technology, Tokyo, Japan
Первая страница:1541
Последняя страница:1546
Аннотация:Along with the tsunami waves, co-seismic bottom deformations result in formation of residual hydrodynamic fields in the ocean such as horizontal displacements of water particles and geostrophic vortex. This study is aimed at developing a method of calculation of the residual hydrodynamic fields. Initially, the problem is considered in the case of ocean of constant depth and cylindrically symmetric analytical solution of the problem is obtained. It is shown that under typical conditions the residual horizontal displacements of water particles can exceed tens or even hundreds of meters. At the same time, velocity and free surface disturbance in the geostrophic vortex exhibits negligibly small values. Considering the assumption of zero disturbance of free surface in the geostrophic vortex a practical method of calculation of the residual horizontal displacements of water particles is suggested. The method takes into account sphericity of the Earth, real bathymetry and co-seismic bottom deformation in a tsunami source. Finally, the method is applied for the estimation of the residual horizontal displacements of water particles in the vicinity of the 2003 Tokachi-oki tsunami source. Perspectives of usage of the static hydrodynamic fields for the sake of tsunami warning are discussed.