2010. National Geophysical Data Center. This line shapefile shows lines of equal vertical intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference Fie... National Atlas of the United States.
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2010. National Geophysical Data Center. This shapefile contains isodynamic lines (lines of equal total intensity of the Earth's magnetic field), derived from the International Geomagnetic... National Atlas of the United States.
2010. National Geophysical Data Center. This map layer shows isogonic lines (lines of constant declination of the Earth's magnetic field), derived from the International Geomagnetic Refer... National Atlas of the United States.
2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation), in the total field intensity of the Earth's magnetic field, derived fro... National Atlas of the United States.
2004. National Atlas of the United States. This point shapefile includes Holocene volcanoes, which are those thought to be active in the last 10,000 years, that are within an extended area o... National Atlas of the United States.
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2005. Reed, John Calvin, Jr. 1930- and Bush, Charles A. This line shapefile contains lines with labels and tags for major geologic units in Alaska, Hawaii, Puerto Rico and the U.S. Virgin Islands. In add... Geological Survey (U.S.).
2005. Reed, John Calvin, Jr. 1930- and Bush, Charles A. This polygon shapefile contains polygon boundaries, tags and labels for major geologic units in Alaska, Hawaii, Puerto Rico and the U.S. Virgin Isl... Geological Survey (U.S.).
2012. Rukstales, Kenneth S. (compiler). This polygon shapefile represents seismic hazards in the United States. The data represent a model showing the probability that ground motion will ... National Atlas of the United States.
2005. Reed, John Calvin, Jr. 1930- and Bush, Charles A. This line shapefile contains text labels (for display purposes) of geologic lines coverages for Alaska, Hawaii, Puerto Rico and the U.S. Virgin Isl... Geological Survey (U.S.).