Earthquake Statistics
Professional earthquake database with information about the currently known earthquakes in history, with RSS feeds and an earthquake
http://earthquakedb.com

Tsunamis
Professional tsunami database with information about the currently known tsunamis in history, with RSS feeds and a tsunami search engine
http://tsunami.name

Volcanoes Information
Browse all the currently known volcanoes with map locations, times of eruptions and much more!
http://volcanodb.com