Worldwide Earthquake Map
The USGS maintains a nice world map of all 2.5+ magnitude volcanoes.
USGS Earthquake Map
U.S. Earthquake Hazard Maps
FEMA U.S. Maps
Earthquakes - Tie-in with Volcanoes
Earthquakes can also be an indication of an increased threat of volcanic eruption as earthquake swarms can point to movement of magma.
Pinatubo
For example, a chronology of events leading up to the 1991 Pinatubo eruption showed hundreds of earthquakes/day two months before the eruption and 1,500 earthquakes about one week before the eruption.
Iceland Volcanoes
Iceland Met Office
Vesuvius
Vesuvius Observatory
Yellowstone
University of Utah seismic stations
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