Testing earthquake links in Mexico from 1978 to the 2017 M = 8.1 Chiapas and M = 7.1 Puebla Shocks

Segou, Margarita; Parsons, Tom. 2018 Testing earthquake links in Mexico from 1978 to the 2017 M = 8.1 Chiapas and M = 7.1 Puebla Shocks. Geophysical Research Letters, 45 (2). 708-714. 10.1002/2017GL076237

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Official URL: http://dx.doi.org/10.1002/2017GL076237

Abstract/Summary

The M = 8.1 Chiapas and the M = 7.1 Puebla earthquakes occurred in the bending part of the subducting Cocos plate 11 days and ~600 km apart, a range that puts them well outside the typical aftershock zone. We find this to be a relatively common occurrence in Mexico, with 14% of M > 7.0 earthquakes since 1900 striking more than 300 km apart and within a 2 week interval, not different from a randomized catalog. We calculate the triggering potential caused by crustal stress redistribution from large subduction earthquakes over the last 40 years. There is no evidence that static stress transfer or dynamic triggering from the 8 September Chiapas earthquake promoted the 19 September earthquake. Both recent earthquakes were promoted by past thrust events instead, including delayed afterslip from the 2012 M = 7.5 Oaxaca earthquake. A repeated pattern of shallow thrust events promoting deep intraslab earthquakes is observed over the past 40 years.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1002/2017GL076237
ISSN:	00948276
Date made live:	16 Apr 2018 14:02 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/519843

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1002/2017GL076237

ISSN:

00948276

Date made live:

16 Apr 2018 14:02 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/519843