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Modelling tsunami initial conditions due to rapid coseismic seafloor displacement: efficient numerical integration and a tool to build unit source databases
- Source :
- Natural Hazards and Earth System Sciences, Vol 24, Pp 2773-2791 (2024)
- Publication Year :
- 2024
- Publisher :
- Copernicus Publications, 2024.
-
Abstract
- The initial conditions for the simulation of a seismically induced tsunami for a rapid, assumed-to-be-instantaneous vertical seafloor displacement is given by the Kajiura low-pass filter integral. This work proposes a new, efficient, and accurate approach for its numerical evaluation, valid when the seafloor displacement is discretized as a set of rectangular contributions over variable bathymetry. We compare several truncated quadrature formulae, selecting the optimal one. The reconstruction of the initial sea level perturbation as a linear combination of pre-computed elementary sea surface displacements is tested on the tsunamigenic Kuril earthquake doublet – a megathrust and an outer rise – that occurred in the central Kuril Islands in late 2006 and early 2007. We also confirm the importance of the horizontal contribution to tsunami generation, and we consider a simple model of the inelastic deformation of the wedge on realistic bathymetry. The proposed approach results are accurate and fast enough to be considered relevant for practical applications. A tool to build a tsunami source database for a specific region of interest is provided.
Details
- Language :
- English
- ISSN :
- 15618633 and 16849981
- Volume :
- 24
- Database :
- Directory of Open Access Journals
- Journal :
- Natural Hazards and Earth System Sciences
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.bd8284ad1177456bbe984cabd8211b70
- Document Type :
- article
- Full Text :
- https://doi.org/10.5194/nhess-24-2773-2024