Slow Slip History for the MEXICO Subduction Zone: 2005 Through 2011

Graham, Shannon; DeMets, Charles; Cabral‐Cano, E.; Kostoglodov, V.; Rousset, Baptiste; Walpersdorf, Andréa; Cotte, Nathalie; Lasserre, Cécile; McCaffrey, Robert J.; Salazar-Tlaczani, Luis

doi:10.1007/s00024-015-1211-x

Cited by 53 publications

(82 citation statements)

References 58 publications

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“…These values are comparable with an estimate of 1.4 ± 0.4 × 10 12 Nm/s for 20 Cascadia SSEs (Schmidt & Gao, 2010). In Mexico, the moment rate is higher, being 7.2-16.1 × 10 12 Nm/s for three large Guerrero events (Graham et al, 2016) and 2.5-2.8 × 10 13 Nm/s for many M w~7 events (Rousset et al, 2017). Although the source of this large discrepancy is unclear, it is probably in the assumptions in each method, such as elastic structure, source geometry, and the definition of duration, and not in the original GPS data.…”

Section: 1002/2018gl077461supporting

confidence: 86%

Seismic Moment, Seismic Energy, and Source Duration of Slow Earthquakes: Application of Brownian slow earthquake model to three major subduction zones

Ide

Maury

2018

Geophysical Research Letters

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Tectonic tremors, low‐frequency earthquakes, very low‐frequency earthquakes, and slow slip events are all regarded as components of broadband slow earthquakes, which can be modeled as a stochastic process using Brownian motion. Here we show that the Brownian slow earthquake model provides theoretical relationships among the seismic moment, seismic energy, and source duration of slow earthquakes and that this model explains various estimates of these quantities in three major subduction zones: Japan, Cascadia, and Mexico. While the estimates for these three regions are similar at the seismological frequencies, the seismic moment rates are significantly different in the geodetic observation. This difference is ascribed to the difference in the characteristic times of the Brownian slow earthquake model, which is controlled by the width of the source area. We also show that the model can include non‐Gaussian fluctuations, which better explains recent findings of a near‐constant source duration for low‐frequency earthquake families.

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Section: 1002/2018gl077461supporting

confidence: 86%

Seismic Moment, Seismic Energy, and Source Duration of Slow Earthquakes: Application of Brownian slow earthquake model to three major subduction zones

Ide

Maury

2018

Geophysical Research Letters

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“…For example, in the Bungo Channel in the Nankai subduction zone, M w 6.8-6.9 SSEs, with durations of ∼1-2 years, occur every ∼5-7 years across overlapping slow slip regions (Yoshioka et al, 2015). In the Guerrero segment of the Mexican subduction zone, M w 7.5-7.7 SSEs, with durations of ∼6-12 months, occur at ∼3-4.5 year intervals and exhibit similar spatial slip distributions to each other (Graham et al, 2016;Radiguet et al, 2012). In the Guerrero segment of the Mexican subduction zone, M w 7.5-7.7 SSEs, with durations of ∼6-12 months, occur at ∼3-4.5 year intervals and exhibit similar spatial slip distributions to each other (Graham et al, 2016;Radiguet et al, 2012).…”

Section: Introductionmentioning

confidence: 91%

“…SSEs in the southwestern Ryukyu subduction zone also exhibit a fairly regular recurrence behavior, with a periodicity of ∼6 months and duration of ∼1 month across the same slip region (Heki & Kataoka, 2008). Furthermore, some of these studies examined the spatiotemporal patterns of slow slip and how they vary from event to event within a single series of SSEs (Graham et al, 2016;Yoshioka et al, 2015). These studies revealed variable static source characteristics, including the magnitudes, durations, recurrence intervals, and spatial slip distributions, within each series of SSEs.…”

Section: Introductionmentioning

confidence: 99%

Variability of the Space‐Time Evolution of Slow Slip Events Off the Boso Peninsula, Central Japan, From 1996 to 2014

Fukuda

2018

JGR Solid Earth

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Global Navigation Satellite System data are inverted to investigate the space‐time evolution of five Mw 6.6–6.7 slow slip events (SSEs) off the Boso Peninsula, central Japan, in 1996, 2002, 2007, 2011, and 2013–2014. Our analyses reveal that the nucleation style and space‐time evolution of slip vary among the five SSEs. The 2002, 2007, and 2011 SSEs nucleated more rapidly, with moment accelerations higher than those of the 1996 SSE by a factor of ∼2–6, and higher than those of the 2013–2014 SSE by an order of magnitude. Furthermore, the 2002, 2007, and 2011 SSEs exhibited more rapid temporal variations in their slip and moment rates and showed larger seismic moments and higher maximum slip rates than the 1996 and 2013–2014 SSEs, suggesting that the overall evolution of the SSEs is correlated with the nucleation style. The along‐strike expansion/propagation of slip is identified for the five SSEs, revealing that the expansion/propagation patterns vary from event to event. The earthquake swarms accompanying the SSEs occurred near the downdip edge of high‐slip‐rate areas, and the seismicity migrated during slow slip with directions and speeds similar to those of the slip expansion/propagation. These space‐time correlations between seismicity and slow slip suggest that the earthquake swarms were triggered by stress changes due to slow slip. The relative timing between the onsets of the SSEs and their associated seismicity varies from event to event and appears to be correlated with the nucleation style of the SSEs.

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“…In section 2, we first present the formalism of the technique, and we apply it to synthetic GPS time series to assess the detection capability of the method and explore its limits in estimating duration and magnitude of small SSEs. In section 3, we apply it to the Guerrero segment of the Mexico subduction zone where large M w ∼ 7.5 SSEs are recurrent [Radiguet et al, 2012;Graham et al, 2016;Radiguet et al, 2016] and the occurrence of smaller ones have been reported [Vergnolle et al, 2010;Frank et al, 2015;Frank, 2016]. This area is particularly favorable for such an application as (1) a relatively dense GPS network has produced high-quality time series since 2005 [e.g., Walpersdorf et al, 2011], (2) the flat slab Figure 1.…”

Section: Introductionmentioning

confidence: 99%

A geodetic matched filter search for slow slip with application to the Mexico subduction zone

et al. 2017

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Since the discovery of slow slip events, many methods have been successfully applied to model obvious transient events in geodetic time series, such as the widely used network strain filter. Independent seismological observations of tremors or low‐frequency earthquakes and repeating earthquakes provide evidence of low‐amplitude slow deformation but do not always coincide with clear occurrences of transient signals in geodetic time series. Here we aim to extract the signal corresponding to slow slips hidden in the noise of GPS time series, without using information from independent data sets. We first build a library of synthetic slow slip event templates by assembling a source function with Green's functions for a discretized fault. We then correlate the templates with postprocessed GPS time series. Once the events have been detected in time, we estimate their duration T and magnitude Mw by modeling a weighted stack of GPS time series. An analysis of synthetic time series shows that this method is able to resolve the correct timing, location, T, and Mw of events larger than Mw 6 in the context of the Mexico subduction zone. Applied on a real data set of 29 GPS time series in the Guerrero area from 2005 to 2014, this technique allows us to detect 28 transient events from Mw 6.3 to 7.2 with durations that range from 3 to 39 days. These events have a dominant recurrence time of 40 days and are mainly located at the downdip edges of the Mw>7.5 slow slip events.

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Slow Slip History for the MEXICO Subduction Zone: 2005 Through 2011

Cited by 53 publications

References 58 publications

Seismic Moment, Seismic Energy, and Source Duration of Slow Earthquakes: Application of Brownian slow earthquake model to three major subduction zones

Seismic Moment, Seismic Energy, and Source Duration of Slow Earthquakes: Application of Brownian slow earthquake model to three major subduction zones

Variability of the Space‐Time Evolution of Slow Slip Events Off the Boso Peninsula, Central Japan, From 1996 to 2014

A geodetic matched filter search for slow slip with application to the Mexico subduction zone

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