Seismicity of Northeast Italy and rapid estimate of earthquake parameters at OGS

Speaker: Angela Sarao
Seismicity of North‐East Italy demarcates the boundary between the Adria microplate and the Eurasian plate. The actual state of stress is a consequence of the Adria microplates progressive motion and its anti‐clockwise rotation with respect to the Eurasian plate. The seismotectonic characteristics of the region are not homogeneous, and the contemporary seismic deformation pattern is quite complex, being the results of the superimposition of several distinct strain fields related to different Alpine phases. The last severe earthquake was the 1976 Ms=6.5 Friuli earthquake, which caused lot of damage and hundreds of casualties. In 1977, after this destructive earthquake an integrated seismic network was installed to monitor the regional seismicity of NE Italy and surroundings as well as to provide high quality data for research projects in regional and global broadband seismology.Since the last years, in the framework of a project supported by the Italian Civil Defence Agency, the routine activity of the OGS seismic monitoring has been enriched with the real time estimate of seismic moment tensor and ShakeMap computation. In the framework of validation of the procedures that we apply for real time estimates, we chose as test cases the 2008 Iwate‐Miyagi Nairiku (Mw=6.9) earthquake and one aftershock of Mw=5.5. During the talk I will present some preliminary results about the validation analysis on Japanese earthquakes and I revise some strong earthquakes occurred in NE Italy and surroundings.