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

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

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30j...3g&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 10, pp. 3-1, CiteID 1496, DOI 10.1029/2003GL017090

Physics

Geophysics

1

Geodesy And Gravity: Crustal Movements-Interplate (8155), Geodesy And Gravity: Space Geodetic Surveys, Mathematical Geophysics: Modeling, Tectonophysics: Plate Boundary-General (3040)

Scientific paper

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.

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