The 2013–2018 Matese and Beneventano Seismic Sequences (Central–Southern Apennines): New Constraints on the Hypocentral Depth Determination

摘要: The Matese and Beneventano areas coincide with the transition from central to southern Apennines are characterized by both SW- NE-dipping normal faulting seismogenic structures, responsible for large historical earthquakes. We studied seismicity means of high-precision locations earthquakes spanning 29 December 2013 4 September 2018. Events were located using all available data temporary permanent stations in area a 1D computed velocity model, inverting dataset Velest code. For events M > 2.8 we used P- S-waves arrival times strong motion study area. A constant value 1.83 Vp/Vs was modified Wadati method. consists 2378 earthquakes, 18,715 12,295 S-wave times. 55 new fault plane solutions. mechanisms show predominantly movements, T-axis trends oriented NE–SW. Only relatively small E–W trending clusters eastern peripheral zones Apenninic belt right-lateral strike-slip kinematics similar that observed Potenza (1990–1991) Molise (2002 2018) sequences. These belong transfer associated differential slab retreat Adriatic plate subduction beneath Apennines. sequence (December 2013–February 2014; main shock Mw 5.0) is most relevant part our dataset. Hypocentral depths along axis agreement previous seismological studies place brittle upper crust. confirm general deepening moving west east Seismicity depth controlled heat-flow, which lower side, thus causing deeper brittle–ductile transition.