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A Mw 6.3 earthquake scenario in the city of Nice (southeast France): ground motion simulations

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Abstract

The southern Alps–Ligurian basin junction is one of the most seismically active zone of the western Europe. A constant microseismicity and moderate size events (3.5 < M < 5) are regularly recorded. The last reported historical event took place in February 1887 and reached an estimated magnitude between 6 and 6.5, causing human losses and extensive damages (intensity X, Medvedev–Sponheuer–Karnik). Such an event, occurring nowadays, could have critical consequences given the high density of population living on the French and Italian Riviera. We study the case of an offshore Mw 6.3 earthquake located at the place where two moderate size events (Mw 4.5) occurred recently and where a morphotectonic feature has been detected by a bathymetric survey. We used a stochastic empirical Green’s functions (EGFs) summation method to produce a population of realistic accelerograms on rock and soil sites in the city of Nice. The ground motion simulations are calibrated on a rock site with a set of ground motion prediction equations (GMPEs) in order to estimate a reasonable stress-drop ratio between the February 25th, 2001, Mw 4.5, event taken as an EGF and the target earthquake. Our results show that the combination of the GMPEs and EGF techniques is an interesting tool for site-specific strong ground motion estimation.

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Authors and Affiliations

  1. Observatoire de la Côte d’Azur, Géoazur Nice-Sophia Antipolis University, CNRS, Nice, France

    Jérome Salichon, Carine Kohrs-Sansorny & Françoise Courboulex

  2. LCPC-CETE Méditerranée, Nice, France

    Etienne Bertrand

  3. Géoazur, 250 rue Albert Einstein, Sophia Antipolis, 06560, Valbonne, France

    Jérome Salichon, Etienne Bertrand & Françoise Courboulex

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  1. Jérome Salichon
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  2. Carine Kohrs-Sansorny
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  3. Etienne Bertrand
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  4. Françoise Courboulex
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Correspondence to Jérome Salichon, Etienne Bertrand or Françoise Courboulex.

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Salichon, J., Kohrs-Sansorny, C., Bertrand, E. et al. A Mw 6.3 earthquake scenario in the city of Nice (southeast France): ground motion simulations. J Seismol 14, 523–541 (2010). https://doi.org/10.1007/s10950-009-9180-0

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