The ground-motion maps presented here (maps A-D) show the expected seismic induced or earthquake caused maximum horizontal acceleration and velocity in rock in the contiguous United States, Alaska, Hawaii, and Puerto Rico. There is a 90 percent probability that the maximum horizontal acceleration and velocity shown on the maps will not be exceeded in the time periods of 50 and 250 years (average

All Maps

Fundamental Science Practices

USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.

Maps showing the distribution of tin, tungsten, arsenic, gold, and silver in nonmagnetic heavy-mineral concentrates derived from stream sediments, Sherbrooke and Lewiston 1° x 2° quadrangles, Maine, New Hampshire, and Vermont

Maps showing the geology of the inner continental shelf, Cape Cod Bay, Massachusetts

Maps showing the results of a subbottom acoustic survey of Boston Harbor, Massachusetts

Metalliferous mineral resource assessment maps of the Mount Hayes Quadrangle, eastern Alaska Range, Alaska

Metallogenic map of stratabound exhalative and related occurrences in Colorado

Mineralogical maps showing the distribution of selected minerals identified in nonmagnetic heavy-mineral concentrates from the Mount Katmai and parts of the Afognak and Naknek quadrangles, Alaska

Natural hazards map of the Circum-Pacific region: Pacific Basin sheet

Orientation, movement history, and cataclastic rocks of Ramapo fault based on core drilling and trenching along the western margin of the Newark basin near Bernardsville, New Jersey

Precambrian basement map of the northern midcontinent, U.S.A.

Preliminary surficial geologic map of the Salt Lake City segment and parts of adjacent segments of the Wasatch Fault zone, Davis, Salt Lake, and Utah counties, Utah

Preliminary surficial geologic map of the Weber segment, Wasatch Fault zone, Weber and Davis counties, Utah

Probabilistic earthquake acceleration and velocity maps for the United States and Puerto Rico

U.S. Geological Survey

U.S. Department of the Interior