The Amatrice 2016 seismic sequence: a preliminary look at the mainshock and aftershocks distribution

Maddalena Michele, Raffaele Di Stefano, Lauro Chiaraluce, Marco Cattaneo, Pasquale De Gori, Giancarlo Monachesi, Diana Latorre, Simone Marzorati, Luisa Valoroso, Chiara Ladina, Claudio Chiarabba, Valentino Lauciani, Massimo Fares

Abstract


We relocated the aftershocks of the MW 6.0 Amatrice 2016 mainshock by inverting with a non-linear probabilitstic method P- and S-arrival time readings produced and released in near realtime by the analyst seismologists of IGNV on duty in the seismic monitoring room. Earthquakes distribution shows the activation of a normal fault system with a main SW-dipping fault extending from Amatrice to NW of Accumoli village for a total length of 40 km. On the northern portion of the main fault hanging-wall volume, the structure become more complex activating an antithetic fault below the Norcia basin. It is worth nothing that below 8-9 km of depth, the whole fault system has an almost continuous sub-horizontal layer interested by an intense seismic activity, about 2 km thick.


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DOI: https://doi.org/10.4401/ag-7227
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X