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Authors: Scognamiglio, Laura* 
Tinti, Elisa* 
Casarotti, Emanuele* 
Pucci, Stefano* 
Villani, Fabio* 
Cocco, Massimo* 
Magnoni, Federica* 
Michelini, Alberto* 
Dreger, D.* 
Title: Complex fault geometry and rupture dynamics of the Mw 6.5, 2016, October 30th central Italy earthquake
Issue Date: 2018
Series/Report no.: /123 (2018)
DOI: 10.1002/2018JB015603
Abstract: We study the October 30th 2016 Norcia earthquake (MW 6.5) to retrieve the rupture history by jointly inverting seismograms and coseismic GPS displacements obtained by dense local networks. The adopted fault geometry consists of a main normal fault striking N155°and dipping 47° belonging to the Mt. Vettore‐Mt. Bove fault system (VBFS) and a secondary fault plane striking N210° and dipping 36° to the NW. The coseismic rupture initiated on the VBFS and propagated with similar rupture velocity on both fault planes. Up‐dip from the nucleation point, two main slip patches have been imaged on these fault segments, both characterized by similar peak‐slip values (~3 m) and rupture times (~3 s). After the breakage of the two main slip patches, coseismic rupture further propagated southeastward along the VBFS, rupturing again the same fault portion that slipped during the August 24th earthquake. The retrieved coseismic slip distribution is consistent with the observed surface breakages and the deformation pattern inferred from InSAR measurements. Our results show that three different fault systems were activated during the October 30th earthquake. The composite rupture model inferred in this study provides evidences that also a deep portion of the NNE‐trending section of the Olevano‐Antrodoco‐Sibillini (OAS) thrust broke co‐seismically, implying the kinematic inversion of a thrust ramp. The obtained rupture history indicates that, in this sector of the Apennines, compressional structures inherited from past tectonics can alternatively segment boundaries of NW‐trending active normal faults or break co‐seismically during moderate‐to‐large magnitude earthquakes.
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