Análisis de la actividad sísmica en el Golfo de Tehuantepec (Fosa Mesoamericana, México)terremotos de magnitudes elevadas en relación con fallas normales, réplicas e implicaciones sismotectónicas
- David Amador Luna 1
- Francisco M. Alonso-Chaves 1
- Carlos Fernández 1
- Encarnación García-Navarro 1
- 1 Universidad de Huelva, España
ISSN: 0213-683X
Year of publication: 2018
Issue Title: Comunicaciones presentadas en la LXIV Sesión Científica / Ávila, 1 de Junio de 2018
Issue: 64
Pages: 23-26
Type: Article
More publications in: Geogaceta
Abstract
This work describes the seismic series occurred between September 2017 and February 2018 in Mexico, which includes an earthquake of Mw=8.2, and another two of magnitude greater than 7.0. The detailed study of their focal mechanisms, and the spatial distribution of the main earthquakes and their aftershocks, allow a seismotectonic interpretation of this seismic activity. It is here suggested that, in the general setting of the subduction of the Cocos Plate under the North America Plate, close to their triple junction with the Caribbean Plate, the subducting slab is subjected to a strong stretching below the Tehuantepec Gulf (probably due to a slab roll back process or to a great activity of the slab pull force), which gave rise to the main event. The subsequent seismic activity that affected the North America Plate would have been triggered by that main event.