Pattern of seismicity in the Lucanian Apennines and foredeep (Southern Italy) from recording by SAPTEX temporary array

A. Frepoli, F. R. Cinti, L. Amicucci, G. B. Cimini, P. De Gori, S. Pierdominici

Abstract


The deployment of a temporary seismic network in Southern Italy during 2001-2004 (the SAPTEX array, Southern
APennine Tomography EXperiment) allowed us to relocate the hypocenters of Southern Apennines earthquakes
with low uncertainty among the location parameters. The best array distribution of the SAPTEX network
for the analysis of seismicity in the Lucanian Apennines and foredeep was reached in the first two years of
recording. The SAPTEX data were merged with those of the Italian National Seismic Network (RSNC) operated
by the Istituto Nazionale di Geofisica e Vulcanologia (INGV). For the hypocenters computation of events in
the upper Agri Valley we also included P- and S- waves arrivals from the local Eni-Agip network. The seismicity
for the Lucanian Apennines and foredeep in the analyzed period has magnitudes ranging from 2.0 to 4.1. A
major finding is the identification of two different crustal domains: the westernmost characterizing the chain,
mostly with shallow earthquakes (within about 20 km of depth), and the easternmost one belonging to the outer
margin of the chain and to the foredeep, with deeper seismicity (mostly between 20-40 km of depth). Thirty
fault-plane solutions were computed and used for stress inversion; most of them are related to earthquakes within
the chain sector and indicate a generalized NE-SW extension. Moreover, the dense network allowed us to improve
the location of events relative to two low magnitude sequences which occurred in the study period.

Keywords


seismicity;seismic network;motectonics;Lucanian Apennines;Lucanian foredeep;Southern Italy

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References


DOI: https://doi.org/10.4401/ag-3252
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X