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- Title
Modelling tsunami initial conditions due to rapid coseismic seafloor displacement: efficient numerical integration and a tool to build unit source databases.
- Authors
Abbate, Alice; González Vida, José M.; Castro Díaz, Manuel J.; Romano, Fabrizio; Bayraktar, Hafize Başak; Babeyko, Andrey; Lorito, Stefano
- 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.
- Subjects
NUMERICAL integration; SEA level; EARTHQUAKES; DATABASES; BATHYMETRY; TSUNAMIS
- Publication
Natural Hazards & Earth System Sciences, 2024, Vol 24, Issue 8, p2773
- ISSN
1561-8633
- Publication type
Article
- DOI
10.5194/nhess-24-2773-2024