SEISMIC ACTIVITY IN THE POLLINO REGION (BASILICATA-CALABRIA BORDER) A. Amato 1 , G. Cecere 1 , C. Chiarabba 1 , P. De Gori 1 , M. Di Bona 1 , A. Gervasi 1 , A. Govoni 1,2 , F.P. Lucente 1 , L. Margheriti 1 , F. Mele 1 , M. Moretti 1 , L. Scognamiglio 1 , G. Selvaggi 1 and E. Tinti 1 1 Istituto Nazionale di Geofisica e Vulcanologia, Centro Nazionale Terremoti 2 Istituto Nazionale di Oceanografia e di Geofisica Sperimentale Introduction. The Pollino region and the whole Calabria-Lucania border are known for the absence of destructive (M>6) historical earthquakes. This lack of historical seismicity is noticeable in the analysis of Southern Apennines and Calabria earthquake history (Rovida et al., 2011). At the same time, paleoseismological studies found evidence for significant active faulting (Cinti et al., 1997; Michetti et al., 1997) pointing to the Pollino area as a seismic gap. Instrumental seismicity in the region is characterized by the occurrence of seismic sequences, one of the most significant in the last decades is the Mercure seismic sequence, Mw 5.6 in September 1998 (Brozzetti et al., 2008). For this reason, the sequence started in 2010 raised a big concern in the population and local authorities. INGV is following the evolution of the sequence since its beginning, in March 2010, increasing the seismic monitoring and planning several activities and projects. The area was proposed by INGV to DPC (Dipartimento di Protezione Civile nazionale) for inclusion in the projects to be carried out in the present INGV-DPC agreement. This project has just started and will try to provide better constraints to the active tectonics and fault identification of the region. In this paper we describe what INGV is doing to understand better the tectonics of the region using microseismicity, and try to offer some cue to the discussion about the seismogenic faults in the area. Historical earthquakes. Earthquakes reported in the historical catalogues for this area are not very strong. For this reason, in the 1984 seismic hazard map of Italy and even in the proposal of 1998, the region had hazard values lower than the northern and the southern areas. However, the more recent seismic zonation ZS9 (Meletti et al., 2008) and the 2003-2004 seismic hazard map identifies the whole Lucania-Calabria Apennines as a homogeneous region capable of large earthquakes and hence with high seismic hazard (http://zonesismiche.mi.ingv.it). The Parametric Catalogue of Italian earthquakes (CPTI11, Rovida et al., 2011), shows very well the lack of strong earthquakes in the region, contrary to the southern Apennines and the Calabria area. In the former, there is clear evidence of large earthquakes in the Campania-Basilicata area, mainly the M~7 earthquake in 1857. To the south, several strong earthquakes hit the Sila region and 5 GNGTS 2012 SESSIONE 1.1 Event date and time latitude longitude depth Ml 2012-09-14 03:50:11.000 39.896 16.019 7.6 3.7 2012-09-07 12:40:51.000 39.877 16.028 8.5 3.4 2012-09-01 14:02:45.000 39.887 16.004 7.8 3.4 2012-08-26 15:44:38.000 39.877 16.206 6.8 3.0 2012-08-19 17:45:08.000 39.875 16.005 5.0 3.7 2012-05-28 01:32:10.000 39.906 16.094 8.0 3.2 2012-05-28 01:06:27.000 39.859 16.118 3.0 4.3 2011-12-24 20:17:50.360 39.920 16.023 8.1 3.3 2011-12-02 21:25:38.240 39.910 15.997 8.0 3.2 2011-12-01 14:01:20.020 39.933 15.998 9.9 3.3 2011-11-23 14:12:33.590 39.912 16.019 7.5 3.6 2010-11-09 08:43:19.890 40.048 15.934 10.4 3.7 2010-03-25 17:30:17.900 40.028 15.857 7.8 3.2 Tab.1 - Earthquakes in the Pollino region with magnitude larger than 3.