According to theory of plate tectonics, Earth is an active planet -- its surface is composed of many individual plates that move and interact, constantly changing and reshaping Earth's outer layer. Volcanoes and...

Although the San Andreas Fault is the longest and one of the most active fault zones in California, it is not responsible for every earthquake in the state. This video segment describes the geologic setting of the San...

This bulletin discusses the magnitude 7.9 earthquake that shook the islands of Tonga in May 2006. Topics include the tectonic setting of the islands, at the boundary of the Pacific and Australian plates, the frequent...

This set of lists and maps provides information on the latest earthquakes for the 50 states and Puerto Rico. The lists are organized by date and time, and by magnitude. On the interactive maps, symbols are coded by size...

This on-line project is part of the Center for Improved Engineering and Science Education (CIESE) program. As they complete this series of lessons, students will use real-time data to solve a problem, study the...