The Effects of Sliding Block as a Kind of Submarine Mass Movements on the Tsunami Amplitudes

摘要

The aim of this study is to contribute to understanding of the effects ofsubmarine mass movement, ‘sliding block’, on tsunami amplitudesusing basic source model. This study aims to see effect of movement asa block differently from pioneering studies that investigate submarinelandslide and its effects on tsunami amplitudes. To define model, twosliding blocks moving with different velocities in different directionsare considered. The differences of tsunami peak amplitudes among thesliding blocks’ movements in different depths and distances arecompared. The interaction of near fiel tsunami amplitudes are discussedwith different velocities, depths and distances. In the model, mass isconserved. Laplace and Fourier transform methods are used for thesolution of equations and linearized shallow water wave theory isassumed.. The results show that during the source process, when thevelocity of masses are much faster than velocity tsunami, thedisplacements on the free surface above the source resembles thedisplacement of the floor. Results for tsunami peak amplitudes arepresented for mentioned parameters. The effects of sliding block slideas a kind of submarine mass movements on the tsunami amplitudes andthe interaction of the tsunami wave forms are examined for specifiedparameters and illustrated.