Article
Geosciences, Multidisciplinary
Haekal A. Haridhi, Bor Shouh Huang, Kuo Liang Wen, Arif Mirza, Syamsul Rizal, Syahrul Purnawan, Ilham Fajri, Frauke Klingelhoefer, Char Shine Liu, Chao Shing Lee, Crispen R. Wilson, Tso-Ren Wu, Ichsan Setiawan, Van Bang Phung
Summary: Near the northern border of Sumatra, the Sumatran fault zone splits into two branches and extends into the offshore. Large submarine landslides have been triggered by the extended fault zone, as indicated by seismic profiles. Based on simulation, the strike-slip fault system can generate a potential tsunami hazard along the northern coast of Aceh.
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Kei Katsumata
Summary: This study presents a method for inferring shallow slow slip events (SSEs) based on seismic quiescence. Shallow SSEs near the trench axis are difficult to observe because they are located far offshore from geodetic networks on land. The study found an unusual decrease in the occurrence rate of M >= 5.0 earthquakes in the southwestern Kurile Islands, with no earthquakes observed for 16 years after 2004, compared to an average rate of approximately 1.3 events per year between 1977 and 2004. The spatial pattern of seismic quiescence can be explained qualitatively by the Coulomb failure stress change due to shallow SSE, and its fault plane is on the upper boundary of the subducting Pacific plate in the focal area of the 1975 tsunami earthquake.
GEOSCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Kenta Tozato, Shinsuke Takase, Shuji Moriguchi, Kenjiro Terada, Yu Otake, Yo Fukutani, Kazuya Nojima, Masaaki Sakuraba, Hiromu Yokosu
Summary: This study presents a framework for rapid tsunami force predictions using mode-decomposition-based surrogate modeling. The framework captures the temporal and spatial characteristics of tsunami forces through large-scale numerical simulations and constructs a surrogate model for instant predictions. A numerical example validates the effectiveness of this framework in evaluating time-series data of hydrodynamic force.
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
(2022)
Article
Multidisciplinary Sciences
J. Selva, S. Lorito, M. Volpe, F. Romano, R. Tonini, P. Perfetti, F. Bernardi, M. Taroni, A. Scala, A. Babeyko, F. Lovholt, S. J. Gibbons, J. Macias, M. J. Castro, J. M. Gonzalez-Vida, C. Sanchez-Linares, H. B. Bayraktar, R. Basili, F. E. Maesano, M. M. Tiberti, F. Mele, A. Piatanesi, A. Amato
Summary: Probabilistic tsunami forecasting (PTF) offers a method for tsunami early warning that factors in uncertainties, improving accuracy and enabling rational decision making. Developed and tested for near-source tsunami warning, PTF demonstrates accurate forecasting over a wide range of past earthquakes.
NATURE COMMUNICATIONS
(2021)
Article
Geochemistry & Geophysics
B. Gombert, J. C. Hawthorne
Summary: Slow earthquakes can have varying durations, moments, and slip and propagation speeds. This study examines tremor bursts with durations between 1 and 30 minutes, which are likely driven by short bursts of aseismic slip. Using a coherence-based technique, thousands of tremor bursts beneath Vancouver Island in Cascadia are detected, and 17 of the ruptures are examined. The study finds that tremor migrates at rates of 3-25 m/s, filling a gap in the spectrum of observed slow earthquakes and suggesting the existence of faster slip and propagation in smaller ruptures.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Shiying Nie, Sylvain Barbot
Summary: This study examines the dynamics of fault behavior in the parametric space of frictional conditions, showing that seismogenic slow-slip events are natural for homogeneous faults under near velocity-neutral conditions. The presence of material heterogeneity may explain the spatio-temporal clustering and migration features of tremor activity.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Multidisciplinary Sciences
Laurent Bollinger, Yann Klinger, Steven L. Forman, Odonbaatar Chimed, Amgalan Bayasgalan, Ulziibat Munkhuu, Ganzorig Davaasuren, Tulga Dolgorsuren, Bayarsaikhan Enkhee, Demberel Sodnomsambuu
Summary: The spatial distribution of large earthquakes in slowly deforming continental regions is not random, as seismic activity concentrates on specific structures. However, the long return time for large earthquakes along these structures may lead to the misconception that earthquakes in slowly deforming regions are randomly located.
SCIENTIFIC REPORTS
(2021)
Article
Geochemistry & Geophysics
Peng Dong, Ran Xu, Hongfeng Yang, Zhiyin Guo, Kaiwen Xia
Summary: This study investigates the relationships between slow slip events (SSEs) and regular earthquakes (REs) through numerical simulations. The occurrence of SSEs can temporarily accelerate fault decoupling and advance the timing of mainshocks. The interactions between SSEs and REs are more complex than previously thought, and peak slip rate alone cannot distinguish SSEs that may trigger huge earthquakes from regular ones. Additionally, the spatial extent of SSEs is correlated with the occurrence of earthquakes. These findings have major implications for understanding the mechanics of earthquake initiation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Krittanon Sirorattanakul, Zachary E. Ross, Mostafa Khoshmanesh, Elizabeth S. Cochran, Mateo Acosta, Jean-Philippe Avouac
Summary: This study investigates a swarm of over 2,000 earthquakes that occurred near Westmorland, California in 2020 using GPS/GNSS, InSAR, and seismicity data. The research reveals that the swarm was preceded by a shallow slow slip event, with the earthquakes in the early phase predominantly driven by the slow slip event. Later seismic activity suggests the involvement of fluids.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Sebastian Riquelme, Mauricio Fuentes
Summary: For very slow earthquake rupture velocities, the efficiency of tsunamigenic earthquakes cannot neglect rupture velocity. Hypothetical megathrust earthquakes with very slow rupture velocities may amplify energy significantly more than moderate to large earthquakes.
SEISMOLOGICAL RESEARCH LETTERS
(2021)
Article
Multidisciplinary Sciences
Luigi Passarelli, Paul Antony Selvadurai, Eleonora Rivalta, Sigurjon Jonsson
Summary: The study shows that slow slip events (SSEs) can lead to aseismic strain release along with seismic tremor and earthquake swarms. Larger SSEs tend to last longer and are associated with more intense tremor activity. There is a correlation between aseismic and seismic moment release, with shallower SSEs producing larger seismic moment release than deeper SSEs.
Article
Engineering, Geological
Nikos Kalligeris, Vassilios Skanavis, Marinos Charalampakis, Nikolaos S. Melis, Evangelos Voukouvalas, Alessandro Annunziato, Costas E. Synolakis
Summary: On October 30th, 2020, a magnitude 7.0 earthquake off the northern coast of Samos, Greece triggered a tsunami that affected the Greek islands and the Aegean coast of Turkey. Detailed post-event field surveys revealed tsunami height and runup measurements on five islands. The warning message sent by the General Secretariat for Civil Protection of Greece to all cell phones in the eastern Aegean region before the second flood in Vathi highlights the importance of timely evacuation. Inferring complete tsunami hydrographs from measurements of the first two floods in Vathi revealed a rapid rise in water levels of about one meter overland flow depth.
BULLETIN OF EARTHQUAKE ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Satoru Baba, Kazushige Obara, Shunsuke Takemura, Akiko Takeo, Geoffrey A. Abers
Summary: The study revealed the presence of very low frequency earthquakes (VLFEs) around the Nicoya Peninsula, mainly near the trench axis and overlapping with large slip areas of slow slip events. Additionally, low frequency tremor signals were found to occur within the same time windows as VLFEs on high-frequency seismogram envelopes.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
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
Geosciences, Multidisciplinary
Sean Kuanhsiang Chen, Yih-Min Wu, Yu-Chang Chan
Summary: This article explores the potential occurrence of a megathrust earthquake in the southernmost Ryukyu subduction zone and the influence of slow slip events on the triggering of such an earthquake. The analysis of historical earthquakes and seismic observations suggests a higher potential for a megathrust earthquake, and the slow slip events may play a role in triggering it.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
J. Weston, E. R. Engdahl, J. Harris, D. Di Giacomo, D. A. Storchak
GEOPHYSICAL JOURNAL INTERNATIONAL
(2018)
Article
Geosciences, Multidisciplinary
Susan L. Bilek, Thorne Lay
Article
Geochemistry & Geophysics
Susan L. Bilek, Brandon Schmandt, Lindsay L. Worthington, Richard C. Aster, Tori S. Finlay, Jonathan Schmidt
SEISMOLOGICAL RESEARCH LETTERS
(2018)
Article
Geochemistry & Geophysics
Justin R. Sweet, Kent R. Anderson, Susan Bilek, Michael Brudzinski, Xiaowei Chen, Heather De-Shon, Chris Hayward, Marianne Karplus, Katie Keranen, Charles Langston, Fan-Chi Lin, M. Beatrice Magnani, Robert L. Woodward
SEISMOLOGICAL RESEARCH LETTERS
(2018)
Editorial Material
Geochemistry & Geophysics
Domenico Di Giacomo, E. Robert Engdahl, Dmitry A. Storchak
Article
Geology
Emily A. Morton, Susan L. Bilek, Charlotte A. Rowe
Article
Geosciences, Multidisciplinary
John P. Ortiz, Mark A. Person, Peter S. Mozley, James P. Evans, Susan L. Bilek
Article
Geochemistry & Geophysics
N. R. Ranasinghe, L. L. Worthington, C. Jiang, B. Schmandt, T. S. Finlay, S. L. Bilek, R. C. Aster
SEISMOLOGICAL RESEARCH LETTERS
(2018)
Article
Geochemistry & Geophysics
Tori S. Finlay, Lindsay L. Worthington, Brandon Schmandt, Nishath R. Ranasinghe, S. L. Bilek, Richard C. Aster
SEISMOLOGICAL RESEARCH LETTERS
(2020)
Article
Geochemistry & Geophysics
Kristine L. Pankow, Michael Stickney, Jeri Y. Ben-Horin, Mairi Litherland, Suzette Payne, Keith D. Koper, Susan L. Bilek, Kyren Bogolub
SEISMOLOGICAL RESEARCH LETTERS
(2020)
Article
Geochemistry & Geophysics
M. Glasgow, B. Schmandt, R. Wang, M. Zhang, S. L. Bilek, E. Kiser
Summary: The Raton Basin has been an area of injection-induced seismicity, with machine-learning techniques used to analyze four years of seismic data and reveal new fault and seismic characteristics. These features show that seismic activity is predominantly releasing tectonic stress, rather than being induced by high-rate injections.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
S. M. Niklasson, M. Veneziani, C. A. Rowe, P. F. Worcester, M. A. Dzieciuch, S. L. Bilek, S. F. Price, A. F. Roberts
Summary: The hydroacoustic environment in the rapidly warming Arctic Ocean is affected by changes in the physical environment and increased human activity. It is necessary to update previous acoustic calculations to reflect current and future conditions. Earth System Models are important for projecting changes in physical processes under future climates. We compare Arctic acoustic travel times based on the Energy Exascale Earth System Model, measured travel times from the Canada Basin Acoustic Propagation Experiment, and travel times predicted by empirical temperature and salinity observations, in order to test the impact of changes in Arctic sound speed profiles on acoustic travel times and connect Arctic hydroacoustics with the changing Arctic environment as described by a climate model.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
S. L. Bilek, A. J. Luhmann, R. Grapenthin, Han Byul Woo, J. A. Gochenour
Summary: This study analyzed variations in subsurface flow processes through a karst aquifer in southeastern Minnesota by conducting injection experiments and observing a natural recharge event using a temporary seismic network. The experiments involved injecting approximately 13,000 liters of water into an overflow spring, while the natural event was triggered by a 70-minute rainstorm. Seismic signals recorded during these events provided insights into the largest amplitude signals and changes in groundwater levels, but further modeling is necessary to determine the exact cause of these signals.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Emily A. Morton, Susan L. Bilek, Charlotte A. Rowe
Summary: By using offshore seismometers and automated analysis, we detected and analyzed the earthquakes in the offshore seismogenic zone of the CSZ. The findings provide valuable information about the locking behavior of the megathrust fault and the extent of the seismogenic zone, which is significant for understanding offshore seismic activity and tsunami prediction.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
H. B. Woo, S. L. Bilek, J. A. Gochenour, R. Grapenthin, A. J. Luhmann, J. B. Martin
Summary: The phase cross-correlation and time-frequency phase-weighted-stacking (PCC-PWS) method is more effective than the conventional amplitude-based cross-correlation and linear stacking (TCC-Lin) method in extracting short-period wave velocities, especially in regions with complex shallow structures. The signal-to-noise ratio and the number of wavelengths propagating between station pairs have a significant impact on the data/solution quality. The PCC-PWS method requires fewer cross-correlation functions compared to the TCC-Lin method, making it advantageous in limited data collection time.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2023)