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Global Tsunami Science: Past and Future, Volume I pp 3775–3794Cite as

Birkhäuser

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

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Abstract

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.

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Authors and Affiliations

  1. Instituto Português do Mar e da Atmosfera, IPMA, Lisbon, Portugal

    R. Omira

  2. Instituto Dom Luiz, IDL, University of Lisbon, Lisbon, Portugal

    R. Omira, L. Matias & M. A. Baptista

  3. Instituto Superior de Engenharia de Lisboa, ISEL, Instituto Politécnico de Lisboa, Lisbon, Portugal

    M. A. Baptista

Authors
  1. R. Omira
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  2. L. Matias
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  3. M. A. Baptista
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Correspondence to R. Omira .

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Editors and Affiliations

  1. U.S. Geological Survey MS 999, Middlefield Rd 345, 94025, Menlo Park, CA, USA

    Eric L Geist

  2. Georgia Inst of Technology Sch of Civil & Environmental Eng, Atlantic Dr 790, 30332, Atlanta, GA, USA

    Hermann M. Fritz

  3. Russian Academy of Sciences P.P. Shirshov Institute of Oceanology, Nakhimovski Prospect 36, 117997, Moskva, Russia

    Alexander B. Rabinovich

  4. Hokkado University, N10W8, Kita-ku, 060-0810, Sapporo, Japan

    Yuichiro Tanioka

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Omira, R., Matias, L., Baptista, M.A. (2016). Developing an Event-Tree Probabilistic Tsunami Inundation Model for NE Atlantic Coasts: Application to a Case Study. In: Geist, E.L., Fritz, H.M., Rabinovich, A.B., Tanioka, Y. (eds) Global Tsunami Science: Past and Future, Volume I. Pageoph Topical Volumes. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-55480-8_7

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