Constraining families of dynamic models using geological, geodetic and strong ground motion data: The Mw 6.5, October 30th, 2016, Norcia earthquake, Italy

The 2016 Central Italy earthquake sequence is characterized by remarkable rupture complexity, including highly heterogeneous slip across multiple faults in an extensional tectonic regime. dense coverage and high quality of geodetic seismic data allow us to image intriguing details the kinematics largest sequence, Mw 6.5 October 30th, Norcia earthquake, such as energetically weak nucleation phase. Several kinematic models suggest fault planes rupturing simultaneously, however, mechanical viability not guaranteed. Using 3D dynamic wave propagation simulations accounting for two planes, we constrain “families” spontaneous informed a high-resolution model earthquake. These families differ their parameterization initial shear stress strength framework linear weakening friction. First, dynamically validate kinematically inferred two-fault geometry rake inferences with based on only depth-dependent constant friction coefficients. Then, more complex spatially parameters retrieve distributions similar target yield good agreement observations. We discuss consistency assumed or static coefficients properties rocks at 3-10 km depth characterizing Italian Apennines local geological lithological implications. that suites well-fitting belonging same family generally exist can be derived exploiting trade-offs between parameters. Our approach will applicable classify scenarios match observations well constraints.