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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 7 | Copyright
Nat. Hazards Earth Syst. Sci., 17, 1253-1265, 2017
https://doi.org/10.5194/nhess-17-1253-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 21 Jul 2017

Research article | 21 Jul 2017

Synthetic tsunami waveform catalogs with kinematic constraints

Maria Ana Baptista1,2, Jorge Miguel Miranda2,3, Luis Matias2, and Rachid Omira2,3 Maria Ana Baptista et al.
  • 1Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, Lisbon, Portugal
  • 2Instituto Dom Luiz, Faculdade de Ciências da Universidade de Lisboa, Universidade de Lisboa, Lisbon, Portugal
  • 3Instituto Português do Mar e da Atmosfera, Lisbon, Portugal

Abstract. In this study we present a comprehensive methodology to produce a synthetic tsunami waveform catalogue in the northeast Atlantic, east of the Azores islands. The method uses a synthetic earthquake catalogue compatible with plate kinematic constraints of the area. We use it to assess the tsunami hazard from the transcurrent boundary located between Iberia and the Azores, whose western part is known as the Gloria Fault. This study focuses only on earthquake-generated tsunamis. Moreover, we assume that the time and space distribution of the seismic events is known. To do this, we compute a synthetic earthquake catalogue including all fault parameters needed to characterize the seafloor deformation covering the time span of 20000 years, which we consider long enough to ensure the representability of earthquake generation on this segment of the plate boundary. The computed time and space rupture distributions are made compatible with global kinematic plate models. We use the tsunami empirical Green's functions to efficiently compute the synthetic tsunami waveforms for the dataset of coastal locations, thus providing the basis for tsunami impact characterization. We present the results in the form of offshore wave heights for all coastal points in the dataset.

Our results focus on the northeast Atlantic basin, showing that earthquake-induced tsunamis in the transcurrent segment of the Azores–Gibraltar plate boundary pose a minor threat to coastal areas north of Portugal and beyond the Strait of Gibraltar. However, in Morocco, the Azores, and the Madeira islands, we can expect wave heights between 0.6 and 0.8m, leading to precautionary evacuation of coastal areas. The advantages of the method are its easy application to other regions and the low computation effort needed.

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In this work, we present a methodology to compute a synthetic catalog of tsunami waveforms. To do this, we compute a synthetic earthquake catalog that respects the kinematics of the plate boundary. We use a method to do the fast computation of tsunami waveforms for all events of the synthetic waveform catalog. The method can be used in similar geological environments.
In this work, we present a methodology to compute a synthetic catalog of tsunami waveforms. To...
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