The 1997 Umbria-Marche, Italy, earthquake sequence : a first look at the main shocks and aftershocks

Autor: Enzo Boschi, Giulio Selvaggi, Maurizio Ripepe, Stéphane Gaffet, Francesco Mariano Mele, Alberto Basili, Davide Piccinini, Claudio Chiarabba, Massimo Cocco, Françoise Courboulex, Alessandro Amato, Riccardo Mario Azzara, Lucia Margheriti, Salvatore Mazza, Lauro Chiaraluce, M. Di Bona, G. Bittarelli, Anne Deschamps, G. B. Cimini
Přispěvatelé: Géoazur (GEOAZUR 6526), Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 1998
Předmět:
Zdroj: Geophysical Research Letters
Geophysical Research Letters, 1998, 25 (15), pp.2861-2864. ⟨10.1029/98GL51842⟩
Geophysical Research Letters, American Geophysical Union, 1998, 25 (15), pp.2861-2864. ⟨10.1029/98GL51842⟩
ResearcherID
Scopus-Elsevier
HAL
ISSN: 0094-8276
1944-8007
Popis: Geophysical Research Letters, vol. 25, pp. 2861-2864, 1998; International audience; A long sequence of earthquakes, six with magnitudes between 5 and 6, struck Central Italy starting on September 26, 1997, causing severe damages and loss of human lives. The seismogenic structure consists of a NW-SE elongated fault zone extending for about 40 km. The focal mechanisms of the largest shocks reveal normal faulting with NE-SW extension perpendicular to the trend of the Apennines, consistently with the Quaternary tectonic setting of the internal sector of the belt and with previous earthquakes in adjacent regions. Preliminary data on the main shocks and aftershocks show that extension in this region of the Apennines is accomplished by normal faults dipping at low angle (•40 ø) to the southwest, and confined in the upper •8 km of the crust. These normal faults might have reactivated thrust planes of the Pliocene compressional tectonics. The aftershock distribution and the damage patterns also suggest that the three main shocks ruptured distinct 5 to 15 km-long fault segments, adjacent and slightly offset from one another.
Databáze: OpenAIRE
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