URLs listed in this category:
Earthquake
Largest known earthquake database with statistics and information about locations, magnitudes, with google earth support, search engine and RSS feeds
http://earthquakedb.com
Tsunami
Largest known tsunami database with statistics and information about locations, magnitudes, with google earth support, search engine and RSS feeds
http://tsunami.name
Volcano Statistics
Browse all the currently known volcanoes with map locations, times of eruptions and much more!
http://volcanodb.com