we won't know if they have delayed filming any time soon. but i looked up the city that they are filming in, Montepulciano, and it's approximately 2 hours and 45 minit away from L'Aquila, which is where the initial earthquake hit. but if aftershocks were felt in Rome, which is about 1 jam and 30 minit away, there is a chance that they could have been felt in Montepulciano.
the earthquakes that just happened italy might delay the part of volterra shooting in new moon but we the peminat-peminat won't know if it will unless they say something about it in the news i hope they don't delay it but they haven't berkata if the area where there going to be filming got any damage atau not . but i heard on the news that the italy earth quake was felt all the way to parts of rome . but that doesn't mean that where there filming for volterra got damage i guess everybody will have to read what they put on twilight lexicon to see if anything shows up about where there be filming.