Sediment depth in the Northern Colima graben from 3-D interpretation of gravity ( Mexico).

Abstract

The N-S trending Colima Graben is one of 3 large graben systems which intersect 50 km SSW of Guadalajara, Mexico. Results from a gravity survey conducted within the N part of the Colima Graben indicate that a 20 mgal Bouguer gravity anomaly is associated with graben infilling sediments, relative to gravity measured on plateaux on both sides of the graben. The 3-D 2-body modeling of the gravity data indicates that the sediment depth is as much as 900 m. An estimate of 2.5 km of vertical offset within the N Colima Graben is obtained from combining the predicted sediment depth with the topographic relief.-Author