Ground shaking caused by the sudden release of accumulated strain by an abrupt shift of rock along a fracture in the earth or by volcanic or magmatic activity, or other sudden stress changes in the earth.
Lists of largest earthquakes in the world and in the United States, earthquake facts and statistics, deaths from earthquakes, earthquakes by magnitude, and significant earthquakes.
Online database of faults and associated folds in the United States that are believed to be sources of significant earthquakes during the last 1.6 million years.
Description of seismograms and how they are produced by drum recorders and electronic instruments with real-time seismograms for Northern California and Long Valley, California and representative seismograms for types of earthquake activity.
Online booklet giving an introduction to the concept of plate tectonics and complements the information on the map This Dynamic Planet published in 1994 by the U.S. Geological Survey (USGS) and the Smithsonian Institution.
Online booklet on earthquake history, earthquake occurrences, measuring earthquakes, causes, relationship of volcanoes and earthquakes and earthquake prediction.
U.S. Department of the Interior |
U.S. Geological Survey