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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.