GEOLOGICAL SOCIETY OF THE PHILIPPINES

NUMERICAL COMPUTATIONS OF TSUNAMIS THAT CAN BE GENERATED BY MANILA TRENCH EARTHQUAKES

 

Laarni dela Cruz1, Ricardo C.H. del Rosario1 and Glenda Besena2

1 Department of Mathematics, University of the Philippines Diliman

2 Phippine Institute of volcanology and Seismology

 

Numerical computations of tsunamis will be made for possible earthquake occurrence in the Manila trench. The linear and nonlinear forms of the shallow water equations will be used as the governing equations. The linear shallow water equations are discredited with the explicit leap frog finite difference scheme. The nonlinear shallow water equations are discredited with the same explicit leap frog finite difference scheme, wherein the nonlinear advective term is discredited with an upwind scheme. A moving boundary treatment is used to track a possible movement of the shortline. Three location of sources along the Manila trench with different fault parameters are used to create different earthquake scenarios. The model output consists of snapshots tsunami amplitude all over the grid, maximum tsunami amplitude at each grid cell over the entire duration of simulation and time histories of sea surface displacement at selected grid points near the coast of Bataan, Manila Bay and Batangas.

 
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Geological Society of the Philippines

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