Slow slip event in the Mexican subduction zone: Evidence of shallower slip in the Guerrero seismic gap for the 2006 event revealed by the joint inversion of InSAR and GPS data

Cavalié, Olivier; Pathier, Erwan; Radiguet, Mathilde; Vergnolle, Mathilde; Cotte, Nathalie; Walpersdorf, Andréa; Kostoglodov, V.; Cotton, Fabrice

doi:10.1016/j.epsl.2013.02.020

Cited by 57 publications

(72 citation statements)

References 31 publications

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“…They principally manifest as slow-slip events (SSEs) that produce deformation measurable at the Earth's surface (Dragert et al, 2001) and low-intensity seismic emission called non-volcanic or tectonic tremor (TT) (Obara, 2002). Despite significantly different event durations that vary from minutes for TT to months for SSEs, and consequently significantly different magnitudes, all slow earthquake family members are strongly temporally, and frequently spatially, linked (Rogers and Dragert, 2003;Shelly et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Along-fault pore-pressure evolution during a slow-slip event in Guerrero, Mexico

Frank

Shapiro

Husker

et al. 2015

Earth and Planetary Science Letters

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122

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Section: Introductionmentioning

confidence: 99%

Along-fault pore-pressure evolution during a slow-slip event in Guerrero, Mexico

Frank

Shapiro

Husker

et al. 2015

Earth and Planetary Science Letters

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122

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“…Along the Pacific coast of Mexico, there are two distinctly defined seismic gaps: the Tehuantepec and Guerrero gaps. The latter gap has been studied in detail by previous researchers (e.g., Kostoglodov et al 2001;Cavalié et al 2013;Bekaert et al 2015). The main reason for such studies is because this gap represents a high hazard to nearby Mexico City (Mori et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Tsunami Source Inversion Using Tide Gauge and DART Tsunami Waveforms of the 2017 Mw8.2 Mexico Earthquake

Adriano

Fujii

Koshimura

et al. 2017

Pure Appl. Geophys.

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Abstract-On September 8, 2017 (UTC), a normal-fault earthquake occurred 87 km off the southeast coast of Mexico. This earthquake generated a tsunami that was recorded at coastal tide gauge and offshore buoy stations. First, we conducted a numerical tsunami simulation using a single-fault model to understand the tsunami characteristics near the rupture area, focusing on the nearby tide gauge stations. Second, the tsunami source of this event was estimated from inversion of tsunami waveforms recorded at six coastal stations and three buoys located in the deep ocean. Using the aftershock distribution within 1 day following the main shock, the fault plane orientation had a northeast dip direction (strike ¼ 320 , dip ¼ 77 , and rake ¼ À92 ). The results of the tsunami waveform inversion revealed that the fault area was 240 km 9 90 km in size with most of the largest slip occurring on the middle and deepest segments of the fault. The maximum slip was 6.03 m from a 30 9 30 km 2 segment that was 64.82 km deep at the center of the fault area. The estimated slip distribution showed that the main asperity was at the center of the fault area. The second asperity with an average slip of 5.5 m was found on the northwest-most segments. The estimated slip distribution yielded a seismic moment of 2:9 Â 10 21 Nm (Mw = 8.24), which was calculated assuming an average rigidity of 7 Â 10 10 N/m 2 .

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“…Meanwhile, another area, devoid of characteristic repeating earthquakes, is located along the northwestern segment of the Guerrero Gap. The deficit in repeating earthquakes sequences, in this segment, may be explained by partial locking, which coincides with the along strike segment associated with SSEs [ Cavalié et al , ]. The epicentral locations of characteristic repeating earthquakes suggest a 66 km long northwestern segment of the Guerrero Gap, which is ~33 km shorter than generally believed (~100 km [ Kostoglodov et al , , ; Radiguet et al , ]).…”

Section: Discussionmentioning

confidence: 67%

“…It is well known that a large segment of the trench know as the Guerrero Seismic Gap has not ruptured in a large megathrust event for more than a 100 years [ González‐Ruiz and McNally , ; Singh and Mortera , ; Kostoglodov et al , ; Bekaert et al , ; Universidad Nacional Autonoma de Mexico Seismology Group , ]. This along‐strike segment coincides with that of slip zones of reported SSE for the past 15 years [ Walpersdorf et al , ; Cavalié et al , ] and the location of a significant number of repeating earthquakes reported in this study. Consequently, stress transfer and slip budget interaction between the SSE rupture zone and the near trench section of the slab becomes a key factor to properly estimate the seismic hazard and timing between large earthquakes.…”

Section: Transient Phenomena and Slip Budgetmentioning

confidence: 99%

Spatiotemporal variations of characteristic repeating earthquake sequences along the Middle America Trench in Mexico

2016

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Searching for repeating earthquakes allows the examination of spatiotemporal variation of slip budget in the subduction of the Cocos plate in the Guerrero‐Oaxaca region of Mexico. As different transient phenomena continuously load and unload stresses around asperities in an area where megathrust earthquakes nucleate, repeating earthquakes act as track markers for slip on the plate interface. We systematically examined 14 years of waveform records from 2001 through 2014 to identify repeating earthquakes along the subducting segment of the Cocos plate. An analysis of waveform similarity resulted in a significant number (224) of earthquake sequences with highly correlated waveforms (correlation coefficient cc ≥ 0.95 and spectral coherency coh ≥ 0.95). The reported set of correlated waveforms shows a well‐defined clustering in space and substantial temporal variability. We find a significant increase of repeating earthquake activity after the 20 March 2012 Ometepec (Mw 7.4) and 18 April 2014 Tecpan (Mw 7.2) earthquakes as a result of the postseismic relaxation. In contrast, the rupture zone of the 1985 (Mw 8.1) Michoacán earthquake is completely devoid of repeating sequences, suggesting a strongly coupled segment. Examining the temporal behavior of repeating earthquake activity provides a new tool to better understand how creeping of the subduction thrust controls stress release and postseismic relaxation.

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Slow slip event in the Mexican subduction zone: Evidence of shallower slip in the Guerrero seismic gap for the 2006 event revealed by the joint inversion of InSAR and GPS data

Cited by 57 publications

References 31 publications

Along-fault pore-pressure evolution during a slow-slip event in Guerrero, Mexico

Along-fault pore-pressure evolution during a slow-slip event in Guerrero, Mexico

Tsunami Source Inversion Using Tide Gauge and DART Tsunami Waveforms of the 2017 Mw8.2 Mexico Earthquake

Spatiotemporal variations of characteristic repeating earthquake sequences along the Middle America Trench in Mexico

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