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Neo-deterministic seismic hazard assessment in North Africa |
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| Authors: | T Mourabit K M Abou Elenean A Ayadi D Benouar A Ben Suleman M Bezzeghoud A Cheddadi M Chourak M N ElGabry A Harbi M Hfaiedh H M Hussein J Kacem A Ksentini N Jabour A Magrin S Maouche M Meghraoui F Ousadou G F Panza A Peresan N Romdhane F Vaccari E Zuccolo |
| Institution: | 1. Département de Géologie, Université Abdelmalek Essaadi, BP. 416, 90001, Tangiers, Morocco 2. National Research Institute of Astronomy and Geophysics, NRIAG, 11421, Helwan, Cairo, Egypt 3. Centre de Recherche en Astronomie, Astrophysique et Géophysique, CRAAG, BP. 63, Bouzaréah, Algiers, Algeria 4. Faculté de Génie Civile, Université de Bab Ezzouar (USTHB), BP. 32, El Alia, Algiers, Algeria 5. Tripoli University, Tripoli, Libya 6. Evora University, Evora, Portugal 7. OLMAN-RN, Faculté Pluridisciplinaire, Nador, Université Mohamed I, Oujda, Morocco 8. Nuclear Power Project, Société Tunisienne de l’Electricité et du Gaz, STEG, Tunis, Tunisia 9. Faculté des Science de Sfax, Sfax, Tunisia 10. Ecole Nationale des Ingénieurs de Tunis, Tunis, Tunisia 11. Centre National de Recherche Scientifique et Technique, Rabat, Morocco 12. ESP Section, SAND Group, The Abdus Salam International Centre for Theoretical Physics, ICTP, Strada Costiera 11, 34014, Trieste, Italy 13. Dipartimento di Matematica e Geoscienze, Università di Trieste, Via Weiss, 4, 34128, Trieste, Italy 14. Institut de Physique du Globe, UMR 7516, 5 rue R. Descartes, Strasbourg, France 15. Institute of Geophysics, China Earthquake Administration, Beijing, China |
| Abstract: | North Africa is one of the most earthquake-prone areas of the Mediterranean. Many devastating earthquakes, some of them tsunami-triggering, inflicted heavy loss of life and considerable economic damage to the region. In order to mitigate the destructive impact of the earthquakes, the regional seismic hazard in North Africa is assessed using the neo-deterministic, multi-scenario methodology (NDSHA) based on the computation of synthetic seismograms, using the modal summation technique, at a regular grid of 0.2?×?0.2°. This is the first study aimed at producing NDSHA maps of North Africa including five countries: Morocco, Algeria, Tunisia, Libya, and Egypt. The key input data for the NDSHA algorithm are earthquake sources, seismotectonic zonation, and structural models. In the preparation of the input data, it has been really important to go beyond the national borders and to adopt a coherent strategy all over the area. Thanks to the collaborative efforts of the teams involved, it has been possible to properly merge the earthquake catalogues available for each country to define with homogeneous criteria the seismogenic zones, the characteristic focal mechanism associated with each of them, and the structural models used to model wave propagation from the sources to the sites. As a result, reliable seismic hazard maps are produced in terms of maximum displacement (D max), maximum velocity (V max), and design ground acceleration. |
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