Complex fault geometry and rupture dynamics of the Mw 6.5, 2016, October 30th central Italy earthquake

摘要: We study the October 30th 2016 Norcia earthquake (MW 6.5) to retrieve rupture history by jointly inverting seismograms and coseismic GPS displacements obtained dense local networks. The adopted fault geometry consists of a main normal striking N155°and dipping 47° belonging Mt. Vettore-Mt. Bove system (VBFS) secondary plane N210° 36° NW. initiated on VBFS propagated with similar velocity both planes. Up-dip from nucleation point, two slip patches have been imaged these segments, characterized peak-slip values (~3 m) times s). After breakage patches, further southeastward along VBFS, rupturing again same portion that slipped during August 24th earthquake. retrieved distribution is consistent observed surface breakages deformation pattern inferred InSAR measurements. Our results show three different systems were activated composite model in this provides evidences also deep NNE-trending section Olevano-Antrodoco-Sibillini (OAS) thrust broke co-seismically, implying kinematic inversion ramp. indicates that, sector Apennines, compressional structures inherited past tectonics can alternatively segment boundaries NW-trending active faults or break co-seismically moderate-to-large magnitude earthquakes.