microtremor

Noun.  (geology) Any of the continuous background movements of the Earth's surface and interior, having a period of 1 to 9 seconds, not associated with any seismic activity.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.