USGS Earthquake Facts and Statistics
Gus mentioned to me that the USGS collects earthquake data. Among other things, they will tell you the last earthquake in New York (or any other state) and show you a seismic hazard map of New York (or any other state if you follow the link from their by-state index). However, in trying to find a "last five or ten earthquakes in New York" feed, I stumbled on the Earthquake Facts and Statistics page, which contains this gem:
We detect, but generally do not locate, about 50 mine blasts (explosions) throughout the United States on any given business day. These blasts typically occur between noon and 6 PM local time Monday through Saturday. Of these, about one event every two days is large enough that we compute a location for the blast and post it to a separate explosions listing.
(See a map here.)
You guys! You bunch of crazy scientists.