Good post over on Volcano Cafe about this:
http://www.volcanocafe.org/the-apennine-fault/
Looks as though there is a history of faults 'unzipping' in that area and it looks to be purely tectonic, though it may not be fully over which must be concerning for people living in the region.
I'm no expert, but from what I've read the connections between tectonic events and volcanic activity tend to be tenuous at best, and difficult to prove. A famous example of a potential connection between the two would be the 62 AD Pompeii earthquake, which was of course followed 17 years later by the 79 AD eruption of Vesuvius.