Abstract
Abstract During the time span 1999-2003 was set up and repeatedly surveyed a not permanent GPS network located across one of the highest seismic areas of the central Apennines (Italy). The Central Apennine Geodetic Network (CA-GeoNet), extends across Umbria, Abruzzo, Marche and Lazio regions, in an area of ?180x130 km, from Tyrrhenian to the Adriatic sea. It consists in 125 GPS stations distributed at 3-5 km average grid and includes 7 permanent GPS stations operated by the Italian Space Agency (ASI) and the Istituto Nazionale di Geofisica and Vulcanologia (INGV). With the aim to estimate the active strain rate across this part of the chain, the GPS sites have been located on the main geological units of the area and across the typical basin and range structures, related with the main seismogenic faults. In this paper we show the network and the first results obtained for a subset of 23 stations that have been occupied at least during three repeated campaigns, in the time span 1999-2003. Data analysis, performed by Bernese 4.2 software, shows an extensional rate normal to the chain, in agreement with geological and seismic data. The strain rates in the inner chain are ranging from 12x10-9±11yr-1 to 16x10-9±11yr-1 and from -14x10-9±11yr-1 to -3x10-9±11yr-1. This result provides an improved estimation of the ongoing deformation of this area with respect to previous studies and is in agreement with the style of deformation inferred from seismicity and with the features of the main seismogenic sources from recent geological and seismological investigations.
Highlights
The development of geodetic space techniques and of the NAVSTAR Global Positioning System (GPS), yelded to the realization of high precision geodetic networks devoted to geodynamic investigations in areas interested by recent active tectonics
For this reason was planned and set up the Central Apennine Geodetic Network (CA-GeoNet), with mean distances between stations at 3-5 kilometres and capable to estimate the sub regional and near field strain rates across the main seismogenic structures and faults, which are supposed to drive the crustal dynamics of this area
If the post-seismic deformations related with the last largest earthquakes (Fucino, 1915, Ms=6.9 and Umbria-Marche, 1997, Ms=5.9), located in the southernmost and northernmost sides of the network respectively, are ended or weak and confined within a few km across the fault (Aoudia et al, 2003), the observed deformation is interseismic, describing the regional and purely elastic deformation field of the region
Summary
The development of geodetic space techniques and of the NAVSTAR Global Positioning System (GPS), yelded to the realization of high precision geodetic networks devoted to geodynamic investigations in areas interested by recent active tectonics. We set up a new GPS geodetic network across an intensely faulted area of Central Apennine (Central Italy), designed to measure the detailed pattern of the current crustal deformations.
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