Earthquake Glossary - basement
basement
Harder and usually older igneous and metamorphic rocks that underlie the main sedimentary rock sequences (softer and usually younger) of a region and extend downward to the base of the crust.
Harder and usually older igneous and metamorphic rocks that underlie the main sedimentary rock sequences (softer and usually younger) of a region and extend downward to the base of the crust.
U.S. Department of the Interior | U.S. Geological Survey
Page URL: http://earthquake.usgs.gov/learn/glossary/?term=basement
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