Rupture Process during the Mw 8.1 2017 Chiapas Mexico Earthquake: Shallow Intraplate Normal Faulting by Slab Bending

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1002/2017GL075956.

Downloads

Download Preprint

Supplementary Files
Authors

Ryo Okuwaki , Yuji Yagi

Abstract

A seismic source model for the Mw 8.1 2017 Chiapas, Mexico, earthquake was constructed by kinematic waveform inversion using globally observed teleseismic waveforms, suggesting that the earthquake was a normal-faulting event on a steeply dipping plane, with the major slip concentrated around a relatively shallow depth of 28 km. The modeled rupture evolution showed unilateral, down-dip propagation northwestward from the hypocenter, and the down-dip width of the main rupture was restricted to less than 30 km below the slab interface, suggesting that the down-dip extensional stresses due to the slab bending were the primary cause of the earthquake. The rupture front abruptly decelerated at the northwestern end of the main rupture where it intersected the subducting Tehuantepec Fracture Zone, suggesting that the fracture zone may have inhibited further rupture propagation.

DOI

https://doi.org/10.31223/osf.io/a47py

Subjects

Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Keywords

waveform inversion, normal faulting, intraplate earthquake, seismic source process, slab bending, subduction zone process

Dates

Published: 2017-11-25 03:45

Older Versions
License

Academic Free License (AFL) 3.0

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.