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

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Authors

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

Abstract

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.

DOI

https://doi.org/10.31223/osf.io/5aet4

Subjects

Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Keywords

Inversion, Seismology, Tsunamis

Dates

Published: 2020-07-20 23:21

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License

GNU Lesser General Public License (LGPL) 2.1

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