RT Journal Article
T1 Assessing the Optimal Tsunami Inundation Modeling Strategy for Large Earthquakes in Subduction Zones
A1 Scala, A.
A1 Lorito, S.
A1 Escalante-Sánchez, Cipriano
A1 Romano, F.
A1 Festa, G.
A1 Abbate, A.
A1 Bayraktar, H. B.
A1 Castro-Díaz, Manuel Jesús
A1 Macías-Sánchez, Jorge
A1 González-Vida, José Manuel
K1 Maremotos - Modelos matemáticos
AB Tsunamis are rare events involving several complex physical phenomena. Due to this complexity and the relative scarcity of observations, tsunami research makes extensive use of numerical simulations. For seismogenic tsunamis, the source is often modeled as an instantaneous sea-floor displacement (IS), while the tsunami propagation and inundation is computed through a shallow water approximation (SW). Here, we investigate what is the best tsunami inundation modeling strategy for different realistic earthquake source size and duration. We use 1D earthquake-tsunami coupled simulations of large M > 8 earthquakes in Tohoku-like subduction zone to test for which conditions the IS and/or the SW approximations can simulate with enough accuracy the tsunami evolution. We use as a reference a time-dependent (TD), multi-layer, non-hydrostatic (NH) 1D model. Source duration, and size, are based on 1D dynamic rupture simulations with realistic stress drop and rigidity. We show that slow ruptures, generating slip in the shallow part of subduction zones (e.g., tsunami earthquakes), and very large events, with an along-dip extent comparable with the trench-coast distance (as occurs for megathrust events) require a TD-NH modeling, especially for regions with steep coastal bathymetry. Conversely, deeper, higher stress-drop events can be modeled through an IS-SW approximation. We finally show that: (a) steeper bathymetries generate larger runups and, (b) a resonant mechanism emerges with runup amplifications associated with larger source size on flatter bathymetries. These results, obtained with 1D modeling, can serve as a guide for the appropriate 2/3D simulation approach for applications ranging from fundamental tsunami science to computational-intensive hazard assessments.
PB American Geophysical Union (AGU) / Wiley
SN 2169-9275
YR 2024
FD 2024-08-06
LK https://hdl.handle.net/10630/44949
UL https://hdl.handle.net/10630/44949
LA eng
NO Scala, A., Lorito, S., Escalante Sánchez, C., Romano, F., Festa, G., Abbate, A., et al. (2024). Assessing the optimal tsunami inundation modeling strategy for large earthquakes in subduction zones. Journal of Geophysical Research: Oceans, 129, e2024JC020941. https://doi.org/10.1029/2024JC020941
NO PID2022‐137637NB‐C21
NO MCIN/AEI/10.13039/501100011033
NO NextGenerationEU/PRTR Grant PDC2022‐133663‐C21
NO NextGenerationEU/PRTR Grant MCIN/AEI/10.13039/50110001103
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 3 mar 2026