Review
Geochemistry & Geophysics
N. Uchida, R. Burgmann
Summary: Research has shown that there were indications of a potential great megathrust earthquake in NE Japan before the 2011 Tohoku earthquake, but a consensus assessment of the hazard was lacking. Since the earthquake, studies have made significant progress in revealing aspects such as coseismic rupture, aftershocks, and slow earthquakes.
REVIEWS OF GEOPHYSICS
(2021)
Article
Geosciences, Multidisciplinary
Liming He, Lixin Wu, Kosuke Heki, Cong Guo
Summary: This study presents the anomalities of total electron content in the ionosphere before the 2011 M(w)9.0 Tohoku-oki earthquake, observed in northern Australia by the Global Navigation Satellite System (GNSS) stations. The onset time of the anomaly, determined by the Akaike's information criterion, is very close to the time observed in Japan. The positive TEC anomalies in Australia appear on the same longitude as the land area of NE Japan, supporting the model that electric fields within the ionosphere redistribute the electrons before large earthquakes.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Multidisciplinary Sciences
Piero Bellanova, Mike Frenken, Yuichi Nishimura, Jan Schwarzbauer, Klaus Reicherter
Summary: The 2011 Tohoku-oki tsunami caused massive damage along the northern Japanese Aomori coast, with the coastal control area being inundated up to 550 m inland. A previously undocumented woody-organic tsunami deposit was discovered, improving understanding of the documented part of the tsunami inundation and reducing underestimation.
SCIENTIFIC REPORTS
(2021)
Article
Geochemistry & Geophysics
Keisuke Yoshida
Summary: Fluid behavior in the crust plays a key role in earthquake occurrence by reducing fault strength and leading to localized high seismic wave attenuation in fault zones. This study examined near-source attenuation in a region of intense swarm activity triggered by fluid movement following the 2011 Tohoku-Oki earthquake in Japan. The method used in this study may be helpful in detecting high pore pressure anomalies at depth and understanding their relationship to earthquake occurrence.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Remote Sensing
Ankang Ren, Keke Xu, Zhenhua Shao, Xinqi Liu, Xiaoyi Wang
Summary: It is found that colored noise in GNSS time series has significant impact on parameter estimation of general linear trajectory models. To overcome this issue, maximum likelihood estimation is used to estimate the colored noise and a nonlinear least square algorithm with colored noise as the stochastic model is employed to calculate timescale parameters. The method is validated through simulation experiments and has shown significant improvements in reducing iteration times and decreasing parameter estimation deviations compared to traditional methods.
Correction
Multidisciplinary Sciences
Su-Yang Wang, Hai-Yang Zhuang, Hao Zhang, Hong-Jun He, Wei-Ping Jiang, Er-Lei Yao, Bin Ruan, Yong-Xin Wu, Yu Miao
Summary: A correction to the paper has been published.
NATURE COMMUNICATIONS
(2021)
Article
Geochemistry & Geophysics
Changzhi Zhai, Yibin Yao, Jian Kong
Summary: The electron density structures of seismo-traveling ionospheric disturbances (STIDs) during the Tohoku earthquake were reconstructed using three-dimensional computerized ionospheric tomography (3DCIT) for the first time, showing consistent results with COSMIC observations. Different types of STIDs exhibited varied speeds and propagation characteristics at different altitudes.
JOURNAL OF GEODESY
(2021)
Article
Astronomy & Astrophysics
Masanao Shinohara, Tomoaki Yamada, Kenji Uehira, Shin'ichi Sakai, Hajime Shiobara, Toshihiko Kanazawa
Summary: A new compact seafloor cable seismic and tsunami observation system has been developed by the research team, which achieves reliability through redundancy using Information and Communication Technology (ICT) and contributes to cost reduction. The system has been continuously collecting high-quality seismic and pressure data since installation, allowing for better monitoring of seismic and tsunami activities through dense observations.
EARTH AND SPACE SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Yuki Kodera, Naoki Hayashimoto, Koji Tamaribuchi, Keishi Noguchi, Ken Moriwaki, Ryo Takahashi, Masahiko Morimoto, Kuninori Okamoto, Mitsuyuki Hoshiba
Summary: After the 2011 Tohoku-Oki earthquake, the Japan Meteorological Agency made significant improvements to their earthquake early warning system by implementing new ground motion prediction methods and incorporating new observation facilities. These updates enhanced the accuracy and timeliness of earthquake predictions, showing substantial progress over the 10 years since the Tohoku-Oki earthquake.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Sambuddha Dhar, Jun Muto
Summary: We propose a new function model that incorporates laboratory-derived constitutive laws in mechanical postseismic models. This model accurately predicts the decade-long time series of inland GNSS stations and decomposes them into displacements due to viscoelastic relaxation and afterslip. It provides insights into various deformation mechanisms and is an effective tool for forecasting long-term GNSS time series.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Chemistry, Analytical
Dong-Hyo Sohn, Byung-Kyu Choi, Sungshil Kim, Sun-Cheon Park, Won-Jin Lee, Pil-Ho Park
Summary: The study on decaying post-seismic deformation on the Korean Peninsula indicates that crustal movement is gradually returning to its pre-earthquake motion, with the recovery pattern influenced by regional geologic structures and time.
Article
Green & Sustainable Science & Technology
Cunpeng Du, Haitao Yin, Shengwen Yu, Le Yang, Yuan Jia
Summary: This study investigates the impact of the 2011 Tohoku-Oki Mw 9.0 earthquake on the Yishu fault zone. Using GPS data, the study analyzes the fault locking degree and slip rate defect distribution of the Yishu fault zone. The results show that the earthquake had different effects on the southern and northern segments of the fault zone.
Article
Geology
Ken Ikehara, Kazuko Usami, Tomohisa Irino, Akiko Omura, Robert G. Jenkins, Juichiro Ashi
Summary: Deep-sea turbidite deposits are valuable tools for submarine paleoseismology. By analyzing the event deposits from the 2011 Tohoku-oki earthquake and tsunami, researchers found that the deposits originated from multiple sources, indicating widespread seafloor disturbances. Different types of event deposits reflect varying sediment transport pathways, with limited long-distance transport observed despite the wide spatial distribution.
SEDIMENTARY GEOLOGY
(2021)
Article
Engineering, Aerospace
Keke Xu, Rong He, Kezhao Li, Ankang Ren, Zhenhua Shao
Summary: By focusing on high-precision GNSS data processing and analysis, the study reveals the dynamic evolution of tectonics and crustal deformation along subduction zones. Common Mode Errors are removed, deformation signals are extracted, and regional spatiotemporal filtering is utilized to comprehensively display crustal motion characteristics.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Geochemistry & Geophysics
Dara E. Goldberg, Kirstie L. Haynie
Summary: Global Navigation Satellite Systems (GNSSs) have advanced significantly in the past few decades, providing a dataset that surpasses its original intended purposes. High-rate GNSS receivers now allow for routine consideration of dynamic earthquake ground motions with centimeter-level accuracy. Real-time GNSS observations have lower accuracy compared to post-processed data, but when used in conjunction with available seismic data sources, they are sufficient for rapid earthquake characterization.
SEISMOLOGICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Ignacio Sepulveda, Jennifer S. Haase, Matias Carvajal, Xiaohua Xu, Philip L. F. Liu
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
Angela Chung, Men-Andrin Meier, Jennifer Andrews, Maren Bose, Brendan W. Crowell, Jeffrey J. McGuire, Deborah E. Smith
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2020)
Article
Geochemistry & Geophysics
Diego Melgar, Athanassios Ganas, Tuncay Taymaz, Sotiris Valkaniotis, Brendan W. Crowell, Vasilis Kapetanidis, Varvara Tsironi, Seda Yolsal-Cevikbilen, Taylan Ocalan
GEOPHYSICAL JOURNAL INTERNATIONAL
(2020)
Article
Geochemistry & Geophysics
Diego Melgar, Angel Ruiz-Angulo, Xyoli Perez-Campos, Brendan W. Crowell, Xiaohua Xu, Enrique Cabral-Cano, Michael R. Brudzinski, Luis Rodriguez-Abreu
Summary: The La Crucecita earthquake occurred on a deep megathrust, generating a long-lived tsunami, which highlights important aspects of megathrust behavior and related hazards. With no shallow slip considered, the rupture is within 15-30 km depth.
SEISMOLOGICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
Brendan W. Crowell
Summary: In early 2020, four moderate sized earthquakes occurred in the western United States. High-rate GPS velocity observations were found to provide good agreement with seismic recordings and ShakeMap estimations of peak ground velocity. The study highlights the utility of high-rate GPS velocity observations to strong-motion seismology.
SEISMOLOGICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Ignacio Sepulveda, Jennifer S. Haase, Philip L-F Liu, Mircea Grigoriu, Patricio Winckler
Summary: A new method called non-stationary probabilistic tsunami hazard assessment (nPTHA) is developed to take into account long-term time-varying changes in mean sea level due to climate change. The method uses a non-stationary Poisson process model to specify a temporally varying hazard mean recurrence rate affected by sea level rise. The results show significant impacts of sea-level rise on tsunami hazard assessment when its amplitude is comparable to that of tsunamis with moderate probability of exceedance.
Article
Meteorology & Atmospheric Sciences
J. S. Haase, M. J. Murphy, B. Cao, F. M. Ralph, M. Zheng, L. Delle Monache
Summary: Variations in water vapor carried by atmospheric rivers significantly affect west-coast precipitation, and the AR Recon program aims to improve forecasts by incorporating data from dropsondes, pressure sensors, and potentially airborne GNSS radio occultation. Studying AR characteristics and utilizing ARO technology can enhance forecast accuracy and provide valuable thermodynamic information at no additional cost.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Meteorology & Atmospheric Sciences
Minghua Zheng, Luca Delle Monache, Bruce D. Cornuelle, F. Martin Ralph, Vijay S. Tallapragada, Aneesh Subramanian, Jennifer S. Haase, Zhenhai Zhang, Xingren Wu, Michael J. Murphy, Timothy B. Higgins, Laurel DeHaan
Summary: This study evaluates the impact of assimilating dropsonde data from the AR Reconnaissance program on forecast accuracy for landfalling ARs. The dropsondes reduced root-mean-square error in integrated vapor transport and inland precipitation for over 70% of the Intensive Observation Periods, and improved the spatial pattern of forecasts in all 15 IOPs, with significant skill improvements beyond the short range forecast period.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Geosciences, Multidisciplinary
S. D. Olinger, B. P. Lipovsky, M. A. Denolle, B. W. Crowell
Summary: Ice shelves play an important role in maintaining the stability of marine ice sheets. A study on Pine Island Glacier in West Antarctica reveals that fractures on the glacier are mainly caused by flexural gravity waves. The occurrences of icequakes near the rift tip and shear margin suggest a connection with glaciological stresses and/or localized thinning. Analysis using a flexural gravity wave model estimates that each icequake results in crevasse growth of 4.3-15.9 meters, and water flow may limit the opening rate of the fractures.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Diego Melgar, Angel Ruiz-Angulo, Brendan W. Crowell, Eric J. Fielding, Ericka A. Solano-Hernandez
Summary: In this study, a slip model for the 2021 M 7 Acapulco, Mexico earthquake is presented, which was obtained by inverting strong motion, Global Navigation Satellite Systems, tide gauge, and Interferometric Synthetic Aperture Radar data. The earthquake occurred within the Guerrero gap, a region of concern for its seismogenic potential and lack of large events. The slip model indicates a compact rupture at depths between 10 and 20 km, with two main slip patches. It remains uncertain whether this event signifies a reactivation of large earthquakes in the region. Additionally, a high-resolution hydrodynamic model of the resulting tsunami is produced, highlighting the interaction of bay resonance with shelf modes and edge waves that contribute to the prolonged tsunami disturbances.
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2022)
Article
Geosciences, Multidisciplinary
Jessica N. Ghent, Brendan W. Crowell
Summary: This paper investigates the impact of acoustic-gravity waves generated by the eruption of Tonga's Hunga Tonga-Hunga Ha'apai volcano on the Global Navigation Satellite System. By analyzing data from 818 ground stations, the study identifies supersonic acoustic waves, Lamb waves, and tsunamis with varying magnitudes and characteristics. The research also highlights the presence of a faster perturbation occurring one hour after the eruption, which potentially contributes to premature land arrivals of the tsunami. The arrival time of tsunami-generated disturbances aligns with deep-ocean observations.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Michael J. Murphy, Jennifer S. Haase
Summary: Increasing the density of Global Navigation Satellite System radio occultation with commercial Smallsats and the next generation COSMIC-2 constellation is expected to improve atmospheric state analysis for numerical weather prediction. The study compares different datasets of radio occultation with dropsonde observations and reanalysis products. The results show biases in the radio occultation datasets compared to the reanalysis, particularly in the vertical refractivity gradients within atmospheric rivers. Observations from the commercial Spire constellation are found to be overly smooth and affect the resolution of the low-level structure of atmospheric rivers.
Article
Environmental Sciences
Ignacio Sepulveda, Philip L-F Liu, Mircea Grigoriu, Jennifer S. Haase, Patricio Winckler
Summary: This article introduces two new probabilistic tsunami hazard assessment methods that combine tidal phase uncertainty with other sources of uncertainty. These methods can be applied to non-stationary environments for comprehensive analysis of tsunamis, tides, and sea level rise, and are of great importance for assessing the impact of tsunamis.
Article
Astronomy & Astrophysics
Ignacio Sepulveda, Bing Cao, Jennifer S. Haase, Michael J. Murphy Jr
Summary: Global Navigation Satellite System Interferometric Reflectometry (GNSS-IR) is used to measure water level and significant wave height by analyzing the interference pattern in signal-to-noise ratio. A method was developed to simultaneously measure sea levels and waves using standard geodetic antennas, achieving improved retrieval rate and reduced errors. This technology could be useful for monitoring coastal hazards in under-sampled regions.
EARTH AND SPACE SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
John B. B. DeSanto, Spahr C. C. Webb, Scott L. L. Nooner, David A. A. Schmidt, Brendan W. W. Crowell, Benjamin A. A. Brooks, Todd L. L. Ericksen, C. David Chadwell
Summary: The Mw7.8 Simeonof earthquake on July 22, 2020 ruptured along the Shumagin segment of the Alaska-Aleutian subduction zone. Observations from a seafloor geodetic GNSS-Acoustic site IVB1, located approximately 250 km from the earthquake, showed a velocity of 3.78 ± 1.15 cm/yr prior to the earthquake and a coseismic offset of 0.6 ± 0.7 cm eastward and -15.5 ± 0.8 cm northward. The analysis of the data confirmed that the Simeonof earthquake was a deep megathrust event and suggested significant strain accumulation prior to the earthquake.
GEOPHYSICAL RESEARCH LETTERS
(2023)