GNGTS 2017 - 36° Convegno Nazionale

156 GNGTS 2017 S essione 1.2 Before 1995, very few seismic stations were installed in the area causing a lack of reliable information about hypocenter location and focal mechanisms. Over the years, the number of stations has progressively increased with a significant growth in the years 2004 to 2008 thanks to the implementation of the National Seismic Network in central and southern Italy. With the main aim of reducing the gap of geophysical knowledge in this part of Italy, on April 2013 a local seismic network was installed in the Gargano and Capitanata area in the frame of a scientific cooperation between Greece and Italy, funded by INTERREG programs, the OTRIONS project (Tallarico, 2013). The OTRIONS seismic network is operational since April 23, 2013. It consists of 12 seismic stations, installed on the Gargano promontory and surroundings, each of them composed of a 24-bit SL06/SARA data-logger equipped with a short-period Lennartz 3D–V seismometer. Details on data acquisition and their management are described in de Lorenzo et al. , 2017. Thanks to a scientific collaboration and agreement with the Istituto Nazionale di Geofisica e Vulcanologia (INGV), the seismic data recorded by the OTRIONS seismic Network are available to the INGV in real time. As future development of the collaboration between University of Bari (Italy) and INGV, the OTRIONS seismic network can be integrated with the National Seismic Network with the aim of improving the network coverage in the Gargano area for civil protection purposes. In Fig. 1a, the map of the OTRIONS seismic network is shown. In Fig. 1b, we plotted the seismicity recorded by the OTRIONS seismic network in the period from April 2013 to June 2014 (de Lorenzo et al. , 2017): about 400 events, confined in a rectangle with latitude ranging between 41.5°N and 41.8°N and longitude between 15.3°E and 16°E. The final errors in the location of the events are of the order of 1 km both in the horizontal and in the vertical directions (Fig. 10 in de Lorenzo et al. , 2017). The Italian National Geothermal Database was recently revised and updated (Trumpy and Manzella, 2017). The geothermal data are currently stored in a client-server relational database management system, which is the core of a web application hosted in a dedicated website named Geothopica (http://geothopica.igg.cnr.it/ ). The Geothopica website provides a useful platform for interactive and efficient queries, analysis, and visualization of geothermal dataset. The Italian National Geothermal Database has two different versions of the surface heat flux density. In particular, the heat flow map (Della Vedova et al. , 2001) also reports the most important factors influencing surface heat flow distribution such as deep meteoric water infiltration areas Fig. 1 - Geographic map of the Gargano area (southern Italy). Isolines of heat flow density (mWm -2 ) (Della Vedova et al. , 2001), are superimposed. a) The stations of the OTRIONS local seismic network are shown as red triangles; b) epicenters of seismic events (de Lorenzo et al. , 2017) are shown as dots colored according to depth.