GNGTS 2019 - Atti del 38° Convegno Nazionale

292 GNGTS 2019 S essione 2.1 The growing interest to the open access to ground-motion data, web-services, and tools motivate every year a new ITACA release. The current one (ITACA 3.0 on March 2019 http:// itaca.mi.ingv.it ), in particular, has a renewed web interface and substantial changes in the database content and services. In this work, we present a brief overview of the main features of ITACA 3.0 (Fig. 2). ITACA 3.0 contains 41,444 accelerograms relative to 1,883 seismic events with magnitude greater than 3.0, occurred in the time frame 1972-2018 and recorded by about 1,378 recording stations; more than 30,000 waveforms are manually processed by specialists. In particular, ITACA3.0 includes 858 manually processed waveforms acquired by 36 stations of the temporary seismic network 3A (Fig.1), installed during the 2016-2017 central Italy sequence under the coordination of the Seismic Microzonation Center (CentroMS, Centro di Microzonazione Sismica https://centromicrozonazionesismica.it/it/ ). A remarkable contribution is given by the main sequences occurred in the last decade in Italy: 2009 L’Aquila (April 6 - Mw6.1), 2012 Emilia (May 20 - Mw6.1, May 29 - Mw6.0), and 2016 Central Italy (August 24 - Mw6.0, October 26 - Mw5.9, October 30 - Mw6.5). The bulk of data relates to crustal events (depth<30 km) with epicentral distance 10 - 100 km in the magnitude interval 3.0 – 4.0. Given the predominance of middle and low magnitudes, the majority of focal mechanism are undefined, while for the largest events (Mw>6) the normal faulting prevails (Fig. 3). Fig. 3 - Statistics of ITACA 3.0 concerning waveforms, stations, and events. The updates mainly concern the Station pages, which benefited from the campaigns of geophysical measurements and seismological analyses, carried out in the framework of the Project B2 2016-2018 “Seismic Characterization of accelerometric stations” (Agreement DPC- INGV 2012-2021, Objective 1 - Task B). In addition, a new station reports have been created.