Mexico

Along-strike segmentation of seismic tremor and its relationship with the hydraulic structure of the subduction fault zone

Along the strike of subduction zones, tectonic tremor episodicity is segmented on a geologic scale. Here, we study how this segmentation reflects large-scale variations of the structure and conditions of the fault interface where tremor is generated. …

Subdaily slow fault slip dynamics captured by low-frequency earthquakes

Geodetic positioning is the geophysical record of reference for slow slip events, but typical daily solutions limit studies of the evolution of slow slip to its long-term dynamics. Accompanying seismic low-frequency earthquakes located precisely in …

Interseismic coupling along the Mexican subduction zone seen by InSAR and GNSS

Crust and upper-mantle seismic anisotropy variations from the coast to inland in central and Southern Mexico (2): Correlations with Tectonic Tremor

Seismic anisotropy in the flat slab region of Mexico is compared with tectonic tremor activity. The anisotropy is observed in three separate horizontal layers using a novel technique with receiver functions. Those layers are identified as the …

Moment-duration scaling of low-frequency earthquakes in Guerrero, Mexico

Low-frequency earthquakes (LFEs) are detected within tremor, as small, repetitive, impulsive low-frequency (1--8 Hz) signals. While the mechanism causing this depletion of the high-frequency content of their signal is still debated, this feature may …

Independent component analysis and parametric approach for source separation in InSAR time series at regional scale: application to the 2017--2018 Slow Slip Event in Guerrero (Mexico)

Daily measurement of slow slip from low-frequency earthquakes is consistent with ordinary earthquake scaling

Slow slip transients on faults can last from seconds to months and stitch together the earthquake cycle. However, no single geophysical instrument is able to observe the full range of slow slip because of bandwidth limitations. Here, we connect …

Characteristic tectonic tremor activity observed over multiple slow slip cycles in the Mexican subduction zone

We develop a single-station tremor spectrum template detection method that we applied to continuous seismic data recorded by the Mexican National Seismological Service broadband stations. This allows for an unprecedented long-term analysis of …

Revealing the cluster of slow transients behind a large slow slip event

Capable of reaching similar magnitudes to large megathrust earthquakes [$M_w$ (moment magnitude) $>$ 7], slow slip events play a major role in accommodating tectonic motion on plate boundaries through predominantly aseismic rupture. We demonstrate …

Imbricated slip rate processes during slow slip transients imaged by low-frequency earthquakes

Low Frequency Earthquakes (LFEs) often occur in conjunction with transient strain episodes, or Slow Slip Events (SSEs), in subduction zones. Their focal mechanism and location consistent with shear failure on the plate interface argue for a model …