| Noun | 1. | geological fault - (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other; "they built it right over a geological fault"geology - a science that deals with the history of the earth as recorded in rocks fault line - (geology) line determined by the intersection of a geological fault and the earth's surface inclined fault - a geological fault in which one side is above the other San Andreas Fault - a major geological fault in California; runs from San Diego to San Francisco; the source of serious earthquakes strike-slip fault - a geological fault in which one of the adjacent surfaces appears to have moved horizontally | |