Learning about how earthquakes and volcanos are related is
a good project. A good place to look for information is:
http://vulcan.wr.usgs.gov/Outreach/framework.html.
Mt. St. Helens is an example where there were lots of earthquakes
before the eruption. See:
http://vulcan.wr.usgs.gov/Volcanoes/MSH/description_msh.html#msh_may18