Abstract
In order to predict tsunami hazards through numerical simulation, by using the focal mechanisms as well as fault parameters of Japan’s 2011 Tohoku Earthquake provided by National Geological Survey (referred to as USGS), we proposed a numerical model to simulate the Honshu, Japan tsunami. Numerical computing is conducted to investigate the security along the coast. We also analyzed the simulation results and distribution of tsunami disaster, trying to achieve a more reasonable tsunami warning program. Our numerical model is composed of simulation of surface deformation after the earthquake and the tsunami propagation process which is based on two dimensional shallow water equations. The simulation results show the characteristics of the tsunami propagation, and arrival times on recorder points are consistent with tsunami observation. This model can be applied to evaluate the security of the coastal area and obtain more accurate tsunami warning.
Highlights
In order to predict tsunami hazards through numerical simulation, by using the focal mechanisms as well as fault parameters of Japan’s 2011 Tohoku Earthquake provided by National Geological Survey, we proposed a numerical model to simulate the Honshu, Japan tsunami
Our numerical model is composed of simulation of surface deformation after the earthquake and the tsunami propagation process which is based on two dimensional shallow water equations
We set up several limited fault models according to these focal mechanisms, and compared their tsunami simulation results, and we found that the results of average dislocation model are close to the actual observed data
Summary
Tsunami simulations have been conducted mostly in 2-D space on the basis of the long-wave approximation. Gov/earthquakes/eqinthenews/2011/usc0001xgp/neic_c0001 xgp_wmt.php, referring to seismic dislocations in the slip plane distribution obtained by Gavin Hayes (Finite Fault Model Preliminary Result of the Mar 11, 2011 Mw 8.9 Earthquake Offshore Honshu, Japan Gavin Hayes, USGS) and the aftershock distribution in the plate reduction belt (Subduction Zone Geometry Analysis Preliminary SZGC Results for M 8.9 Earthquake near East Coast of Honshu, Japan, Gavin Hayes, NEIC), parameters of the fault being set as follows: epicenter, 38.321°N, 142.969°E; fault length, 720 km; fault width 200 km; strike angle, 193°; dip angle, 15°; slip angle 81°; average dislocation, 10 m Based on these parameters, we apply elastic half-space theory summarized by Okada [20] to calculate surface deformation of seabed after the earthquake as initial conditions of tsunami waves
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