Developing an Event-Tree Probabilistic Tsunami Inundation Model for NE Atlantic Coasts: Application to a Case Study

  • R. OmiraEmail author
  • L. Matias
  • M. A. Baptista
Part of the Pageoph Topical Volumes book series (PTV)


This study constitutes a preliminary assessment of probabilistic tsunami inundation in the NE Atlantic region. We developed an event-tree approach to calculate the likelihood of tsunami flood occurrence and exceedance of a specific near-shore wave height for a given exposure time. Only tsunamis of tectonic origin are considered here, taking into account local, regional, and far-field sources. The approach used here consists of an event-tree method that gathers probability models for seismic sources, tsunami numerical modeling, and statistical methods. It also includes a treatment of aleatoric uncertainties related to source location and tidal stage. Epistemic uncertainties are not addressed in this study. The methodology is applied to the coastal test-site of Sines located in the NE Atlantic coast of Portugal. We derive probabilistic high-resolution maximum wave amplitudes and flood distributions for the study test-site considering 100- and 500-year exposure times. We find that the probability that maximum wave amplitude exceeds 1 m somewhere along the Sines coasts reaches about 60 % for an exposure time of 100 years and is up to 97 % for an exposure time of 500 years. The probability of inundation occurrence (flow depth >0 m) varies between 10 % and 57 %, and from 20 % up to 95 % for 100- and 500-year exposure times, respectively. No validation has been performed here with historical tsunamis. This paper illustrates a methodology through a case study, which is not an operational assessment.


Tsunami Probabilistic approach Event-tree Inundation NE Atlantic 


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Copyright information

© Springer International Publishing 2016

Authors and Affiliations

  1. 1.Instituto Português do Mar e da Atmosfera, IPMALisbonPortugal
  2. 2.Instituto Dom Luiz, IDLUniversity of LisbonLisbonPortugal
  3. 3.Instituto Superior de Engenharia de Lisboa, ISEL, Instituto Politécnico de LisboaLisbonPortugal

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