Short-term interaction between silent and devastating earthquakes in Mexico
Por:
Cruz-Atienza, V. M., Tago, J., Villafuerte, C., Wei, M., Garza-Giron, R., Dominguez, L. A., Kostoglodov, V., Nishimura, T., Franco, S. I., Real, J., Santoyo, M. A., Ito, Y., Kazachkina, E.
Publicada:
12 abr 2021
Resumen:
Either the triggering of large earthquakes on a fault hosting aseismic
slip or the triggering of slow slip events (SSE) by passing seismic
waves involve seismological questions with important hazard
implications. Just a few observations plausibly suggest that such
interactions actually happen in nature. In this study we show that three
recent devastating earthquakes in Mexico are likely related to SSEs,
describing a cascade of events interacting with each other on a regional
scale via quasi-static and/or dynamic perturbations across the states of
Guerrero and Oaxaca. Such interaction seems to be conditioned by the
transient memory of Earth materials subject to the ``traumatic''
stress produced by seismic waves of the great 2017 (Mw8.2) Tehuantepec
earthquake, which strongly disturbed the SSE cycles over a 650km long
segment of the subduction plate interface. Our results imply that
seismic hazard in large populated areas is a short-term evolving
function of seismotectonic processes that are often observable. This
study shows how seismic and aseismic events are related in Mexico
between 2017 and 2019. Based on a series of observations and models, the
study suggests that the Mw 8.2 intraslab earthquake of 8 September 2017
severely altered the mechanical properties of the plate interface,
facilitating the interaction between the events and disrupting the slow
slip cycles at a regional scale.
Filiaciones:
Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City, Mexico
Facultad de Ingeniería, Universidad Nacional Autónoma de México, Mexico City, Mexico
Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, Mexico City, Mexico
Graduate School of Oceanography, University of Rhode Island, Narragansett, United States
Department of Earth and Planetary Sciences, University of California, Santa Cruz, United States
Escuela Nacional de Estudios Superiores, Universidad Nacional Autónoma de México, Morelia, Mexico
Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan
Gold, Green Published, All Open Access, Green
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