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Initiation of deformation of the Eastern California Shear Zone: Constraints from Garlock fault geometry and GPS observations

Geophysical Research Letters

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Abstract

We suggest a 2-stage deformation model for the Eastern California Shear Zone (ECSZ) to explain the geometry of the Garlock fault trace. We assume the Garlock fault was originally straight and then was gradually curved by right-lateral shear deformation across the ECSZ. In our 2-stage deformation model, the first stage involves uniform shear deformation across the eastern part of the shear zone, and the second stage involves uniform shear deformation across the entire shear zone. In addition to the current shape of the Garlock fault, our model incorporates constraints on contemporary deformation rates provided by GPS observations. We find that the best fitting age for initiation of shear in eastern part of the ECSZ is about 5.0 ?? 0.4 Ma, and that deformation of the western part started about 1.6 Myr later.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Initiation of deformation of the Eastern California Shear Zone: Constraints from Garlock fault geometry and GPS observations
Series title:
Geophysical Research Letters
Volume
30
Issue:
10
Year Published:
2003
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
3
Last page:
1
Number of Pages:
-1