This is a free online volcano database, with information about all the currently known volcanoes. Every volcano features the basic statistics, as well as a very detailed map, with bot urban and satellite photos, and a google earth placeholder.

Largest known tsunami database with statistics and information about locations, magnitudes, with google earth support, search engine and RSS feeds

Largest known earthquake database with statistics and information about locations, magnitudes, with google earth support, search engine and RSS feeds