Campus Units

Geological and Atmospheric Sciences

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

11-18-2019

Journal or Book Title

Tectonophysics

DOI

10.1016/j.tecto.2019.228288

Abstract

When faults form and slip they produce granular wear material that accommodates most of the strain. We investigate the effect of grain size and grain size distribution on slip dynamics by using sheared elliptical acrylic discs as a fault gouge proxy. Physical experiments on three different grain size assemblages are performed in a spring slider apparatus. Our results indicate that below a grain diameter threshold of 1/10 of the shear zone width, increasing grain size corresponds to faster slip velocities during slip events. In experiments with more than one grain size, the relative proportions of grain sizes and effective grain sizes control the bulk behavior. We show that shear zones with grains that are larger than 1/10 of the shear zone width show deformation dynamics that are independent of the small grain fraction. In shear zones where the grain sizes are below this threshold a high abundance of small grains promotes slower and smaller slip events.

Comments

This is a manuscript of an article published as Randolph-Flagg, Jeremy, and Jacqueline E. Reber. "Effect of grain size and grain size distribution on slip dynamics: An experimental analysis." Tectonophysics (2019). doi: 10.1016/j.tecto.2019.228288. Posted with permission.

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Copyright Owner

Elsevier B.V.

Language

en

File Format

application/pdf

Available for download on Wednesday, November 18, 2020

Published Version

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