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[[Image:Guatemala1976EarthquakeMap.jpg|thumb|right|250px|Motagua fault]] GUAP
The '''Motagua Fault''' (also, '''Motagua Fault Zone''') is a major, active left lateral-moving [[transform fault]] which cuts across [[Guatemala]], continuing offshore along the southern Pacific coast of [[Mexico]], returning onshore along the southernmost tip of [[Oaxaca]], then continuing offshore until it merges with the [[Middle America Trench]] near [[Acapulco]]. It forms part of the [[tectonic]] boundary between the [[North American Plate]] and the [[Caribbean Plate]]. It is considered the onshore continuation of the [[Cayman Trench]] which runs under the [[Caribbean Sea]].
 
The Motagua Fault is regarded by some geologists as part of a system of faults designated the "Motagua-Polochic system" rather than as a discrete single boundary. The [[Chixoy-Polochic Fault|Polochic fault]] (also referred to as the Chixoy-Polochic Fault) lies north and parallel to the Motagua Fault and shares some of the motion between the North American and Caribbean Plates.