Initiation of deformation of the Eastern California Shear Zone: Constraints from Garlock fault geometry and GPS observations
Geophysical Research Letters
By: Weijun Gan, P. Zhang, Z.-K. Shen, W.H. Prescott, and J. L. Svarc
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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.
Suggested Citation
Gan, W., Zhang, P., Shen, Z., Prescott, W., and Svarc, J.L., 2003, Initiation of deformation of the Eastern California Shear Zone: Constraints from Garlock fault geometry and GPS observations: Geophysical Research Letters, v. 30, no. 10, p. 3-1.
| 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 |
| Larger Work Title | Geophysical Research Letters |
| First page | 3 |
| Last page | 1 |