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Short-term interaction between silent and devastating earthquakes in Mexico
V M Cruz-Atienza1, J Tago2, C Villafuerte3
1Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City, Mexico. cruz@geofisica.unam.mx.
Nature Communications
|April 13, 2021
Summary
Large earthquakes in Mexico may be triggered by slow slip events (SSEs). These events interact regionally, influenced by past seismic waves, impacting seismic hazard assessment.
Area of Science:
- Seismology
- Geophysics
- Earthquake Science
Background:
- Interactions between large earthquakes and slow slip events (SSEs) are seismologically significant but rarely observed.
- Understanding these interactions is crucial for assessing seismic hazard implications.
Purpose of the Study:
- To investigate the potential relationship between recent major earthquakes in Mexico and preceding SSEs.
- To describe a cascade of seismotectonic events and their regional interactions.
Main Methods:
- Analysis of seismic data and geodetic observations.
- Modeling of quasi-static and dynamic stress transfer across fault zones.
- Examination of the influence of the 2017 Tehuantepec earthquake on SSE cycles.
Main Results:
- Evidence suggests three recent devastating earthquakes in Mexico were linked to SSEs.
- A regional cascade of interacting seismic and aseismic events occurred across Guerrero and Oaxaca.
- The 2017 Tehuantepec earthquake's seismic waves perturbed SSE cycles over a 650 km subduction zone segment.
Conclusions:
- Seismic hazard is a dynamic function of observable seismotectonic processes.
- Earth materials exhibit transient memory influencing earthquake triggering.
- Regional-scale interactions between seismic and aseismic events are critical for hazard evaluation.
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