SAN JACINTO FAULT IN NORTHWESTERN SONORA, MEXICO
Pleistocene and Recent delta sediments immediately east of the mouth of the Colorado River have been cut by a zone of faults which is believed to be a continuation of the San Jacinto fault of California. Sediments on the northeast side of the zone have been elevated and a small amount of right-lateral displacement has occurred. Most of the zone trends northwest but to the southeast faults strike east–west and have an effect on outline of the coast.