Energetic Rupture and Tsunamigenesis during the 2020 Mw 7.4 La Crucecita, Mexico Earthquake

This is a Preprint and has not been peer reviewed. This is version 3 of this Preprint.

This Preprint has no visible version.

Download Preprint

Download Preprint


Diego Melgar , Angel Ruiz-Angulo, Xyoli Pérez-Campos, Brendan W. Crowell, Xiaohua Xu, Enrique Cabral-Cano, Michael Brudzinski , Luis Rodriguez-Abreu


The La Crucecita earthquake ruptured on the megathrust generating strong shaking and a modest, long-lived tsunami. This is a significant earthquake that illuminates important aspects of the behavior of the megathrust as well as the potential related hazards. The rupture is contained within 15-30km depth, ground motions are elevated and the energy to moment ratio is high. We argue that it represents a deep megathrust earthquake, the 30km depth is the down dip-edge of slip. The inversion is well constrained ruling out any shallow slip. It is the narrow seismogenic width and the configuration of the coastline that allow for deformation to occur offshore. The deep asperity is solely responsible for tsunamigenesis. There is significant uplift at the coast above it which leads to negative maximum tsunami amplitudes. Finally, tide gauge recordings show edge wave modes were excited and produce larger amplitudes and durations in the Gulf of Tehuantepec.




Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics


Inversion, Seismology, Tsunamis


Published: 2020-07-20 16:21

Older Versions

GNU Lesser General Public License (LGPL) 2.1

Add a Comment

You must log in to post a comment.


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