Paleostress maps - updated

The Western United States paleostress maps in a previous post are largely based on a compilation used in Pilger (2003).

The merged data set, including Bird's (2002) data set, mentioned in the immediately previous post, has been used for updating the earlier maps. The s_H1 measurements are in light blue for the first 5 m.y. of each 10 m.y. interval and dark blue for the last 5 m.y. Tangents to calculated instantaneous kinematic small circles (see Pilger, 2003, for a description of methodology) are calculated each 5 m.y. as labeled. (Click graphic to enlarge. Click Back button or icon to return to post.)

0-10 Ma

10-20 Ma

20-30 Ma

30-40 Ma

40-50 Ma

50-60 Ma

60-70 Ma

70-80 Ma

80-90 Ma 

90-100 Ma

100-110 Ma

110-120 Ma

120-130 Ma

Reference: Pilger, Rex H., 2003, Geokinematics: Prelude to Geodynamics, Springer-Verlag, Berlin.

©Rex H Pilger, Jr