Gravity field of the southern Colima graben, Mexico

Abstract

The Colima Graben consists of two distinct structural provinces separated by the La Cumbre fault zone. The results of a gravity survey conducted within the coastal and offshore areas of the southern province suggests that the Southern Colima Graben is over 100 km wide and is comprised of two major NE-SW trending grabens. These grabens are separated by a narrow NE-SW trending ridge possibly formed by magma injection along a pre-existing fault. The northwesternmost of these two grabens is 35 km wide and contains 8 km of sediments and the maximum amount of crustal thinning and a shoaling of the Moho occurs under this graben. The southeasternmost graben is 60 km wide and contains 6 km of sediments. -Authors