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High-resolution coastal hazard assessment along the French Riviera from co-seismic tsunamis generated in the Ligurian fault system

  • Fatemeh Nemati
  • Stephan T. GrilliEmail author
  • Mansour Ioualalen
  • Laurie Boschetti
  • Christophe Larroque
  • Jenny Trevisan
Original Paper
  • 58 Downloads

Abstract

The French Riviera is a densely populated and touristic coast. It is also one of the most seismically active areas of the Western Mediterranean. This is evidenced by the Mw 6.7–6.9, 1887 earthquake and tsunami, that was triggered nearshore, rupturing the easternmost 40 km of the 80-km-long Ligurian fault system, which runs parallel to and offshore of the Riviera. Here, coastal hazard from co-seismic tsunamis is assessed along the French and part of the Italian Riviera by simulating three Ligurian earthquake scenarios: (1) the 1887 event offshore Genoa, Italy; (2) a similar event transposed to the westernmost 40-km segment of the fault, offshore Nice, France; and (3) the rupture of the entire 80-km fault, which constitutes an extreme case scenario for the region. Simulations of tsunami propagation and coastal impact are performed by one-way coupling with the Boussinesq model FUNWAVE-TVD, in a series of nested grids, using new high-resolution bathymetric and topographic data. Results obtained in 10-m coastal grids provide the highest resolution predictions to date for this section of the French Riviera of co-seismic tsunami coastal hazard, in terms of inundation, runup, and current velocity. In general, the most impacted areas are bays (near Cap d’Antibes and Cap Ferrat), due to wave buildup and shoaling within semi-enclosed shallow areas, enhanced by possible resonances. In contrast to earlier work, which was based on coarser resolution grids, the area of Nice harbor is found to be rather well sheltered. It should be noted that uniform fault slip was used in the ruptures and runup estimates could locally be enhanced in case of more complex ruptures, such as segmented and heterogeneous ruptures.

Keywords

French Riviera 1887 earthquake Tsunami hazard mapping FUNWAVE-TVD 

Notes

Acknowledgments

Fatima Nemati and Stephan Grilli acknowledge support for this work from the US National Science Foundation Grant CMMI-15-35568. Mansour Ioualalen and colleagues from Géoazur acknowledge support from: (1) the European Commission under the project “Assessment, STrategy And Risk Reduction for Tsunamis in Europe,” ASTARTE (Grant No. 603839), and (2) the French government, through the UCA-JEDI Investments managed by the French National Research Agency (ANR-15-IDEX-01).

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  • Fatemeh Nemati
    • 1
  • Stephan T. Grilli
    • 1
    Email author
  • Mansour Ioualalen
    • 2
  • Laurie Boschetti
    • 2
  • Christophe Larroque
    • 2
  • Jenny Trevisan
    • 2
  1. 1.Department of Ocean Engineering, Graduate School of OceanographyUniversity of Rhode IslandNarragansettUSA
  2. 2.Université Côte d’Azur, IRD, CNRS, Observatoire de la Côte d’Azur, Géoazur, Campus CNRS AzurSophia Antipolis CedexFrance

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