The Transient and Intermittent Nature of Slow Slip

Jolivet, Romain; Frank, W.

doi:10.1029/2019av000126

Cited by 63 publications

(58 citation statements)

References 67 publications

(101 reference statements)

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“…These results are similar to bursts of LFEs detected during the 2006 SSE in the Mexican subduction zone (Frank et al, 2018). These observations suggest that a large-scale, long-term SSE contains a multitude of smaller, temporally clustered events (Jolivet and Frank, 2020).…”

Section: Methodssupporting

confidence: 81%

Detection of deep low-frequency earthquakes in the Nankai subduction zone over 11 years using a matched filter technique

Kato¹,

Nakagawa²

2020

Preprint

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To improve our understanding of the long-term behavior of low-frequency earthquakes (LFEs) along the tremor belt of the Nankai subduction zone, we applied a matched filter technique to continuous seismic data recorded by a dense and highly sensitive seismic network over an 11 year window, April 2004 to August 2015. We detected a total of ~510,000 LFEs, or ~23× the number of LFEs in the JMA catalog for the same period. During long-term slow slip events (SSEs) in the Bungo Channel, a series of migrating LFE bursts intermittently occurred along the fault-strike direction, with slow hypocenter propagation. Elastic energy released by long-term SSEs appears to control the extent of LFE activity. We identify slowly migrating fronts of LFEs during major episodic tremor and slip (ETS) events, which extend over distances of up to 100 km and follow diffusion-like patterns of spatial evolution with a diffusion coefficient of ~10 4 m 2 /s. This migration pattern closely matches the spatio-temporal evolution of tectonic tremors reported by previous studies. At shorter distances, up to 15 km, we discovered rapid diffusion-like migration of LFEs with a coefficient of ~10 5 m 2 /s. We also recognize that rapid migration of LFEs occurred intermittently in many streaks during major ETS episodes. These observations suggest that slow slip transients contain a multitude of smaller, temporally clustered fault slip events whose evolution is controlled by a diffusional process.

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Section: Methodssupporting

confidence: 81%

Detection of deep low-frequency earthquakes in the Nankai subduction zone over 11 years using a matched filter technique

Kato¹,

Nakagawa²

2020

Preprint

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“…A growing body of literature suggests that slow, aseismic slip and rapid, seismic slip bear strong resemblance 9 , 13 , 14 . In particular, recent studies find that they follow comparable scaling relationships in terms of duration and magnitude 14 – 16 .…”

Section: Introductionmentioning

confidence: 99%

“…ince their discovery in Japan at the turn of the millennium 1,2 , slow slip events and associated tectonic tremor and low-frequency earthquakes (LFEs) have been identified in most subduction zones as well as other tectonic environments [2][3][4][5][6][7][8][9] . Slow slip events release energy over much longer durations than classic earthquakes, from a few days to months or even years 2 .…”

mentioning

confidence: 99%

An exponential build-up in seismic energy suggests a months-long nucleation of slow slip in Cascadia

et al. 2020

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Slow slip events result from the spontaneous weakening of the subduction megathrust and bear strong resemblance to earthquakes, only slower. This resemblance allows us to study fundamental aspects of nucleation that remain elusive for classic, fast earthquakes. We rely on machine learning algorithms to infer slow slip timing from statistics of seismic waveforms. We find that patterns in seismic power follow the 14-month slow slip cycle in Cascadia, arguing in favor of the predictability of slow slip rupture. Here, we show that seismic power exponentially increases as the slowly slipping portion of the subduction zone approaches failure, a behavior that shares a striking similarity with the increase in acoustic power observed prior to laboratory slow slip events. Our results suggest that the nucleation phase of Cascadia slow slip events may last from several weeks up to several months.

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“…For the stresses to build up on a fault (whose eventual sudden failure will lead to an earthquake), the fault surface itself is locked in the period between earthquakes, in that no displacement occurs immediately across it. However, an increasing number of observations point to the propensity for faults (in particular subduction zone interfaces) to accommodate transient slow slip within these locked zones (Jolivet and Frank 2020). This slip releases the accumulated elastic energy slowly enough that seismic shaking is not generated, but the motion can be detectable geodetically.…”

Section: Introductionmentioning

confidence: 99%

Earth Observation for the Assessment of Earthquake Hazard, Risk and Disaster Management

Elliott

2020

Surv Geophys

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Earthquakes pose a significant hazard, and due to the growth of vulnerable, exposed populations, global levels of seismic risk are increasing. In the past three decades, a dramatic improvement in the volume, quality and consistency of satellite observations of solid earth processes has occurred. I review the current Earth Observing (EO) systems commonly used for measuring earthquake and crustal deformation that can help constrain the potential sources of seismic hazard. I examine the various current contributions and future potential for EO data to feed into aspects of the earthquake disaster management cycle. I discuss the implications that systematic assimilation of Earth Observation data has for the future assessment of seismic hazard and secondary hazards, and the contributions it will make to earthquake disaster risk reduction. I focus on the recent applications of Global Navigation Satellite System (GNSS) and increasingly the use of Interferometric Synthetic Aperture Radar (InSAR) for the derivation of crustal deformation and these data’s contribution to estimates of hazard. I finish by examining the outlook for EO in geohazards in both science and decision-making, as well as offering some recommendations for an enhanced acquisition strategy for SAR data.

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The Transient and Intermittent Nature of Slow Slip

Cited by 63 publications

References 67 publications

Detection of deep low-frequency earthquakes in the Nankai subduction zone over 11 years using a matched filter technique

Detection of deep low-frequency earthquakes in the Nankai subduction zone over 11 years using a matched filter technique

An exponential build-up in seismic energy suggests a months-long nucleation of slow slip in Cascadia

Earth Observation for the Assessment of Earthquake Hazard, Risk and Disaster Management

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