Propagating Rift Geometry Models

Propagation Geometry

(A) Discontinuous, (B) continuous, and (C) broad transform-zone oceanic propagating/failing rift models. Propagating-rift lithosphere is marked by dark stipple, normal lithosphere created at the doomed rift is indicated by light stipple, and transferred lithosphere is cross-hatched. Red lines show active plate boundaries. Figures A and B modified from Hey (1977) and Hey and others (1980). In Figure C, modified from McKenzie (1986), active axes with full spreading rate are shown as heavy red lines; active axes with transitional rates are shown as dashed red lines; transform zone is shown by red stipple. [From Hey and others (1989).]