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Authors: Maggi, C.* 
Frepoli, A.* 
Cimini, G. B.* 
Console, R.* 
Chiappini, M.* 
Title: Recent seismicity and crustal stress field in the lucanian apennines and surrounding areas (southern italy): seismotectonic implications
Issue Date: 2007
Keywords: Lucanian Apennines
Southern Italy
1D velocity model
focal mechanisms
stress field
Subject Classification04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics 
Abstract: We analyzed the instrumental seismicity of Southern Italy in the area including the Lucanian Apennines and Bradano foredeep, making use of the most recent seismological data base available so far. P- and S-wave arrival times, recorded by the Italian National Seismic Network (RSNC) operated by the Istituto Nazionale di Geofisica e Vulcanologia (INGV), were re-picked along with those of the SAPTEX temporary array deployed in the region in the period 2001-2004. For some events located in the upper Val d’Agri, we also used data from the Eni-Agip seismic network. We examined the seismicity occurred during the period between 2001 and 2006, considering events with magnitudes M 2.0. Firstly, we computed the VP/VS ratio using a modified Wadati method, obtaining a value of 1.83. Secondly, through the use of the VELEST code, we carried out an analysis for the one-dimensional (1D) velocity model that approximates the seismic structure of the study area. Third, we relocated the earthquakes and, for well recorded events, we also computed 108 fault plane solutions. Finally, from this focal mechanism dataset we selected 65 solutions, the more constrained, and used them in an inversion procedure for regional stress information. Earthquake distribution shows three main seismic regions: the westernmost (Apenninic chain) characterized by high background seismicity, mostly with shallow hypocenters, the easternmost below the Bradano foredeep and the Murge with deeper and more scattered seismicity, and finally the more isolated and sparse seismicity localized in the Sila Range and in the offshore area along the Northeastern Calabrian coast. Focal mechanisms computed in this work are in large part normal and strike-slip solutions and their tensional axes (T-axes) have a generalized NE-SW orientation. The denser station coverage allow us to obtain improved hypocenters compared to those obtained by using only RSNC data, observing a well relocated and already known presence of sub-crustal seismicity in the study area.
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