1568. Geological Survey (U.S.) and Environmental Systems Research Institute (Redlands, Calif.). U.S. National Atlas Historic Earthquakes represents the locations of significant, historic earthquakes in United States and adjacent Canada and Mex... ESRI.
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1973. American Geological Institute, Geological Survey (U.S.), Environmental Systems Research Institute (Redlands, Calif.), National Earthquake Information Center, and National Geophysical Data Center. This datalayer is a point coverage representing earthquake epicenters (1973 through March, 2003). Historical data for this layer were derived from:... American Geological Institute.
1568. National Atlas of the United States, Geological Survey (U.S.), and Environmental Systems Research Institute (Redlands, Calif.). U.S. National Atlas Historic Earthquakes represents the locations of significant, historic earthquakes in United States and adjacent Canada and Mex... Esri.