Fault-zone damage promotes pulse-like rupture and back-propagating fronts via quasi-static effects

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1029/2020GL090736. This is version 2 of this Preprint.

Downloads

Download Preprint

Supplementary Files
Authors

Benjamin Idini, Jean Paul Ampuero 

Abstract

Damage zones are ubiquitous components of faults that may affect earthquake rupture.
Simulations show that pulse-like rupture can be induced by the dynamic effect of waves reflected by sharp fault zone boundaries. Here we show that pulses can appear in a highly damaged fault zone even in the absence of reflected waves. We use quasi-static scaling arguments and quasi-dynamic earthquake cycle simulations to show that a crack turns into a pulse after the rupture has grown larger than the fault zone thickness. Accompanying the pulses, we find complex rupture patterns involving back-propagating fronts that emerge from the primary rupture front. Our model provides a mechanism for back-propagating fronts recently observed during large earthquakes. Moreover, we find that slow-slip simulations in a highly-compliant fault zone also produce back-propagating fronts, suggesting a new mechanism for the rapid-tremor-reversals observed in Cascadia and Japan.

DOI

https://doi.org/10.31223/osf.io/v8xr2

Subjects

Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Keywords

Dates

Published: 2019-12-25 17:22

Last Updated: 2022-03-24 15:45

Older Versions
License

CC BY Attribution 4.0 International

Add a Comment

You must log in to post a comment.


Comments

There are no comments or no comments have been made public for this article.