Article
Multidisciplinary Sciences
R. Plata-Martinez, S. Ide, M. Shinohara, E. S. Garcia, N. Mizuno, L. A. Dominguez, T. Taira, Y. Yamashita, A. Toh, T. Yamada, J. Real, A. Husker, V. M. Cruz-Atienza, Y. Ito
Summary: New offshore observations in the Guerrero seismic gap discovered shallow slow earthquakes, which suggest that a portion of the plate interface undergoes stable slip. This may explain the long return period of large earthquakes and why have previous large earthquakes not propagated into the gap.
NATURE COMMUNICATIONS
(2021)
Article
Geochemistry & Geophysics
David Blank, Julia Morgan, Yannick Caniven
Summary: Seismic waves during earthquakes induce transient stress changes in the crust, triggering critically stressed asperities at remote distances with significant time delays. The proposed slow-slip modulated delayed triggering model can account for a wide range of observed delay times, including cases of no delay and no triggering. Triggered slow slip events in nature may serve as warning signs of impending earthquakes, highlighting the importance of high-resolution monitoring of active fault zones.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
C. G. Sammis, M. G. Bostock
Summary: The study analyzes a catalog of low frequency events beneath Vancouver Island in the context of a granular flow model. It finds that the LFEs do not follow Gutenberg-Richter statistics, but are normally distributed with respect to magnitude, and log-normally distributed with respect to moment. The model suggests that LFE families correspond to granular jams in flow that persist over multiple ETS episodes.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Yuta Mitsui, Keiji Uehara, Issei Kosugi, Koji Matsuo
Summary: This study investigates the occurrence of various earthquakes and slow slip phenomena in subduction zones. It is found that regions with high background seismicity correspond to the source areas of large slow slip events, which are not associated with tectonic tremors. Furthermore, these regions also coincide with areas of low free-air gravity anomalies. This suggests that widespread stress perturbations, possibly coupled with pore fluid effects, control seismic and aseismic slip on subduction faults.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Srisharan Shreedharan, Matt Ikari, Clay Wood, Demian Saffer, Laura Wallace, Chris Marone
Summary: This study reports on friction experiments performed on protolith material collected at the Hikurangi margin during the International Ocean Discovery Program Expedition 375. The results show that the frictional velocity dependence and critical slip distance increase with fault slip rate, and the velocity dependence of critical slip distance could be due to a combination of dilatant strengthening and a widening of the active shear zone at higher slip rates. Furthermore, the healing rates in different lithologies are consistent with geodetically inferred low stress drops and healing rates of Hikurangi SSEs on timescales of 1-10 years.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Review
Multidisciplinary Sciences
Whitney M. Behr, Roland Buergmann
Summary: This article reviews the constraints on SST deformation processes, including geophysical observations and geological observations. Research shows that the SST source region is an environment rich in fluids and high fluid pressure. In regions of mixed lithology and near-lithostatic fluid pressures, a combination of frictional-viscous shear may scale with the tremor component of SST.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Multidisciplinary Sciences
V. M. Cruz-Atienza, J. Tago, C. Villafuerte, M. Wei, R. Garza-Giron, L. A. Dominguez, V. Kostoglodov, T. Nishimura, S. I. Franco, J. Real, M. A. Santoyo, Y. Ito, E. Kazachkina
Summary: The study suggests that the devastating earthquakes in Mexico between 2017 and 2019 may be related to slow slip events. It shows how seismic and aseismic events are interrelated, with the Mw 8.2 intraslab earthquake of 8 September 2017 altering the mechanical properties of the plate interface and disrupting slow slip cycles at a regional scale.
NATURE COMMUNICATIONS
(2021)
Article
Environmental Sciences
Christian Brandes, David C. Tanner, Haakon Fossen, Matthias Halisch, Katharina Mueller
Summary: Hidden blind faults have a high seismic hazard potential, and there is a need for a reliable geological indicator of neotectonic activity on such faults. Field measurements show that disaggregation bands have the same orientation as the faults and can serve as an indicator of neotectonic activity on blind faults, even at low slip velocities. Disaggregation bands can be used to detect hidden active faults undergoing aseismic movements.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Geochemistry & Geophysics
Luc L. Lavier, Xinyue Tong, James Biemiller
Summary: Geological observations show that fault zone composition varies, potentially accommodating a mixture of brittle and ductile deformation, with the ratio of these materials and friction changes affecting energy partitioning and slip behavior. The nature of this mixture plays a role in determining whether the fault creeps steadily or engages in slow slip events or fast earthquakes. Structural features observed in simulated creep, slow slip events, and earthquakes have similarities with those seen in natural fault zones, and slip-synchronous strengthening in ductile sections can control the propagation of yearlong slow slip events.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Hitoshi Hirose, Takeshi Matsushima, Takao Tabei, Takuya Nishimura
Summary: Slow slip events (SSEs) lasting for approximately 1 year occur every 6-8 years around the Bungo Channel in the southwest Japan subduction zone. The spatial and temporal relationship between the slip process and other phenomena such as tectonic tremors and SSEs is not well understood. In this study, using data from GNSS stations installed around the Bungo Channel and Hyuganada, the slip evolutions of two SSEs in 2018-2019 and 2015-2016 were estimated, revealing the overlap between the major SSE and the deep episodic tremor and slip (ETS) zone.
EARTH PLANETS AND SPACE
(2023)
Article
Geochemistry & Geophysics
Keisuke Yano, Masayuki Kano
Summary: A new method based on Global Navigation Satellite System (GNSS) data and sparse estimation technique was proposed to detect slow slip events (SSEs). This method achieved high accuracy in identifying candidates of event onsets and provided confidence values for the detections. By applying this method, researchers discovered new SSEs in the Nankai subduction zone and found an increase in low-frequency earthquake activity at the onsets of potential events.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
Yanfang Qin, Gou Fujie, Shuichi Kodaira, Yasuyuki Nakamura, Yuka Kaiho, Tetsuo No, Koichiro Obana, Seiichi Miura
Summary: Recent observations and seismic data analysis have revealed different slow earthquake activities between the Kii Channel and Cape Shionomisaki in the central Nankai Trough. The geometry of the subducting plate surface is suggested to be a key factor contributing to these differences in seismic activity.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
F. Donoso, M. Moreno, F. Ortega-Culaciati, J. R. Bedford, R. Benavente
Summary: A novel method PICCA is proposed to detect transient events related to slow earthquakes in GNSS time series, and the results show that the simultaneous use of PCA and ICA methods can be more effective in searching for transient events.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
Sylvain Michel, Romain Jolivet, Olivier Lengline, Adriano Gualandi, Stacy Larochelle, Blandine Gardonio
Summary: This study provides a comprehensive understanding of transient slip events along the Parkfield segment of the San Andreas Fault. By combining GNSS and seismicity data, the researchers identified frequent seismic slip events during the post-seismic period, highlighting the dynamic nature of seismic and aseismic slip along active faults.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Bing He, XiaoZhuo Wei, Meng (Matt) Wei, Yang Shen, Marco Alvarez, Susan Y. Schwartz
Summary: Slow slip events (SSEs) have been discovered near the trench in some subduction zones, and they are linked to triggering large earthquakes and the absence of tsunamis. These SSEs are usually submarine, making their temporal and spatial extent difficult to observe. In this study, a shallow SSE near the Alaska subduction zone was detected using a machine learning method, and it was found to precede a large earthquake and have implications for tsunami hazard assessment.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
H. Perfettini, W. B. Frank, D. Marsan, M. Bouchon
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Geochemistry & Geophysics
Eric Beauce, William B. Frank, Anne Paul, Michel Campillo, Robert D. van der Hilst
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Multidisciplinary Sciences
William B. Frank, Emily E. Brodsky
Article
Geochemistry & Geophysics
F. Aden-Antoniow, C. Satriano, P. Bernard, N. Poiata, E-M Aissaoui, J-P Vilotte, W. B. Frank
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
Gaspard Farge, Nikolai M. Shapiro, William B. Frank
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
C. J. Chamberlain, W. B. Frank, F. Lanza, J. Townend, E. Warren-Smith
Summary: The 2016 M7.8 Kaikoura earthquake is considered one of the most complex earthquakes in recorded history, involving significant rupture of at least 21 crustal faults. Through the use of various techniques, researchers constructed a catalog of seismic activities and fault ruptures, leading to key findings such as the earthquake nucleating on the Humps Fault and the reactivation of faults from previous sequences.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
F. Aden-Antoniow, W. B. Frank, L. Seydoux
Summary: Earthquake catalogs are crucial for analyzing the evolution of active fault systems and understanding seismic hazards. Determining the background seismicity rate, which is directly related to the stressing rate, is challenging due to the dominance of aftershock sequences. Machine-learning algorithms provide a more accurate approach for distinguishing background earthquakes from aftershock sequences.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Thomas Dylan Mikesell, Aurelien Mordret, Zongbo Xu, William B. Frank
Summary: This study used seismic data from the Polar Earth Observing Network to compute the correlation tensor between Antarctic stations, extracting Rayleigh and Love wave velocity information. Using tomography and inversion algorithms, a 2D isotropic shear-wave velocity model was built, revealing a low-velocity zone beneath Marie Byrd Land and a velocity contrast in the lower crust. The findings have important implications for earthquake research and hypocenter estimation in the region.
SEISMOLOGICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Leoncio Cabrera, Piero Poli, William B. Frank
Summary: This study investigates the precursory phase of the 2009 L'Aquila earthquake in Italy by analyzing seismic catalogs. The research reveals the presence of different seismic and aseismic processes and their interactions prior to the earthquake.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
M. Wimez, W. B. Frank
Summary: The study proposes a recursive matched-filter approach for detecting earthquake swarms. By selecting new template events for matched-filter search, the spatial coverage of the template set can be progressively extended. This method is suitable for systematically exploring earthquake swarms in both volcanic and tectonic contexts.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Jared Bryan, William B. Frank, Pascal Audet
Summary: Temporal changes in seismic velocities are crucial for tracking structural changes within the crust. We propose a deep seismic monitoring method based on teleseismic receiver functions, which provide information about crustal velocity structures from the bottom-up. Using synthetic waveform modelling, we demonstrate that receiver functions are uniformly sensitive to velocity changes throughout the crust and can determine the depth of perturbations. We introduce a novel method using optimal transport for measuring non-linear time-amplitude signal variations in receiver function monitoring, enabling comparison of full waveform distributions.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
L. Maubant, W. B. Frank, L. M. Wallace, C. A. Williams, I. Hamling
Summary: This study investigates the temporal and spatial changes of plate coupling along the Hikurangi subduction zone beneath the North Island of New Zealand using interferometric radar and Global Navigation Satellite System data. The results demonstrate significant spatial variability of plate coupling over different observational periods, highlighting the importance of considering the observational time period when interpreting coupling maps.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Multidisciplinary Sciences
Qing-Yu Wang, William B. B. Frank, Rachel E. E. Abercrombie, Kazushige Obara, Aitaro Kato
Summary: Low-frequency earthquakes are distinct from regular earthquakes and occur in the subduction plate boundary where an aseismic rheology dominates. Their unique waveforms suggest an unusual rupture process or strong attenuation in the source zone. By analyzing seismicity in the Nankai Trough, we find that while the spectral signature of low-frequency earthquakes aligns with the classical earthquake model, their rupture duration and stress drop are significantly different. This suggests that their low-frequency nature is primarily due to an atypical seismic rupture process.
Article
Geosciences, Multidisciplinary
Caroline Mouchon, William B. B. Frank, Mathilde Radiguet, Piero Poli, Nathalie Cotte
Summary: Geodetic positioning is the reference for slow slip events, but daily solutions limit studies. Low-frequency earthquakes can provide a high-resolution time history of slow slip dynamics. The ratio of geodetic to seismic fault slip varies with time, suggesting the saturation of the earthquake source region as slow slip grows.
Article
Geochemistry & Geophysics
Gaspard Farge, Claude Jaupart, William B. Frank, Nikolai M. Shapiro
Summary: This study investigates the segmentation of tectonic tremor activity along subduction zones and its relationship with the structure and conditions of the fault interface. The findings suggest that the density and distribution of valves in the fault zone play a crucial role in synchronizing tremor sources and generating large-scale episodic activity. The study also links the segmentation of tremor activity to the topography of the subducting oceanic plate.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)