Description: U.S. National Atlas Historic Earthquakes represents the locations of significant, historic earthquakes in United States and adjacent Canada and Mexico that caused deaths, property damage, and geological effects, or were otherwise experienced by the resident populations.
Description: U.S. National Atlas Volcanoes represents volcanoes thought to be active in the last 10,000 years (Holocene), in and near the United States. The data is a subset of data available from the Global Volcanism Program, Smithsonian Institution.