Dispersion of tsunamis: does it really matter?

摘要: Abstract. This article focuses on the effect of dispersion in field tsunami modeling. Frequency linear long-wave limit is first briefly discussed from a theoretical point view. A single parameter, denoted as "dispersion time", for integrated frequency identified. parameter depends wavelength, water depth during propagation, and propagation distance or time. Also role long-time asymptotes this context. The wave generation by two main sources, namely earthquakes landslides, are with formulas surface response to bottom sources. Dispersive effects then exemplified through semi-idealized study moderate-strength inverse thrust fault. Emphasis put directivity, significance Boussinesq model employed (dispersive effect), transfer sources initial elevation. Finally, experience series case studies, including earthquake- landslide-generated tsunamis, presented. examples taken both historical (e.g. 2011 Japan 2004 Indian Ocean tsunami) potential tsunamis after La Palma volcanic flank collapse). Attention mainly given deep ocean way accumulation relates time". It turns out that useful indication when important, even though ambiguity respect definition wavelength may be problem complex cases. Tsunamis most landslides moderate tend display dispersive behavior, at least some directions. On other hand, mega events last decade mostly noticeable transoceanic propagation.