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ID 115506
Author
Ichimura, Tsuyoshi The University of Tokyo
Agata, Ryoichiro The University of Tokyo
Hori, Takane Japan Agency for Marine-Earth Science and Technology
Satake, Kenji The University of Tokyo
Ando, Kazuto RIKEN Advanced Institute for Computational Science
Hori, Muneo The University of Tokyo
Keywords
Tsunami analysis method
crust deformation computation method
high-fidelity crustal structure and geometry model
finite element method
Content Type
Journal Article
Description
Higher fidelity seafloor topography and crustal structure models have become available with accumulation of observation data. Previous studies have shown that the consideration of such high-fidelity models produces significant effects, in some cases, on crustal deformation results that are used as inputs for tsunami analysis. However, it is difficult to apply high-fidelity model of crustal deformation computations to tsunami computations because of large computational costs. In this paper, we propose a new crustal deformation computation method for estimating inputs for tsunami computations, which is based on a finite element analysis method with remarkable reduction of computation costs by efficient use of the arithmetic space and the solution space. This finite element analysis method enables us to conduct 102−3-times crustal deformation computations using high-fidelity models with a degree of freedom on the order of 108 for the 2011 Tohoku earthquake example. Tsunami computations with typical settings are conducted as an application example to present the advantages and characteristics of the proposed method. Comparisons between results of the proposed and the conventional method reveal that large shallow fault slip around the trench axis may lead to significant differences in tsunami waveforms and inundation height distributions in some cases.
Journal Title
Journal of Earthquake and Tsunami
ISSN
17934311
17937116
NCID
AA12341070
Publisher
World Scientific Publishing
Volume
11
Issue
5
Start Page
1750018
Published Date
2017-09-18
Remark
著者英表記誤記あり (誤)Mueno Hori →(正)Muneo Hori
Rights
This is an Open Access article published by World Scientific Publishing Company. It is distributed under the terms of the Creative Commons Attribution 4.0 (CC-BY) License(https://creativecommons.org/licenses/by/4.0/). Further distribution of this work is permitted, provided the original work is properly cited.
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language
eng
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departments
Science and Technology