Article
Multidisciplinary Sciences
Omosanya Kamaldeen Olakunle, Lawal Muhedeen Ajibola, Iqbal H. Muhammad, Yizhaq Makovsky
Summary: Seafloor mounds in the Great South Basin offshore New Zealand are potentially hosting seafloor metalliferous deposits, with fluid plumbing systems related to past volcanic activities and multiple fluid sources. The mounds have primary volcanic or hydrothermal origins, with deeper coal beds and shallow foraminiferal oozes serving as secondary fluid sources, forming a main sub-vertical and minor lateral fluid plumbing patterns. The relationship between the mounds, escape pipes, intrusive rocks, and upward routing of mineral-rich fluids could be significant for the formation of ore-grade mineral deposits on the seafloor in the GSB.
SCIENTIFIC REPORTS
(2021)
Article
Geosciences, Multidisciplinary
Alexandre Normandeau, Kevin MacKillop, Meaghan Macquarrie, Clark Richards, Daniel Bourgault, D. Calvin Campbell, Vittorio Maselli, Genevieve Philibert, John Hughes Clarke
Summary: This article discusses how iceberg gouging of continental slopes can lead to submarine landslides, even far from the iceberg source region. By analyzing an event in a Baffin Island fjord, it is shown that icebergs can affect the seafloor at depths greater than their keel depth, triggering submarine landslides. The findings suggest that icebergs from the Arctic, Greenland, and Antarctica can pose hazards thousands of kilometers away and impact continental slopes by initiating submarine landslides, particularly with increased iceberg discharge due to climate change.
Article
Multidisciplinary Sciences
Sev Kender, Kara Bogus, Gunver K. Pedersen, Karen Dybkjaer, Tamsin A. Mather, Erica Mariani, Andy Ridgwell, James B. Riding, Thomas Wagner, Stephen P. Hesselbo, Melanie J. Leng
Summary: The Paleocene-Eocene Thermal Maximum (PETM) was a period of rapid global warming, potentially triggered by carbon released from volcanic activity and involving multiple carbon reservoirs.
NATURE COMMUNICATIONS
(2021)
Article
Environmental Sciences
Mitsuharu Yagi, Tsunefumi Kobayashi, Yutaka Maruyama, Sota Hoshina, Satoshi Masumi, Itaru Aizawa, Jun Uchida, Tsukasa Kinoshita, Nobuhiro Yamawaki, Takashi Aoshima, Yasuhiro Morii, Kenichi Shimizu
Summary: This study provides baseline data on microplastic pollution in commercially important fishes from the coastal and offshore waters near Kyushu, Japan. The findings show that pelagic fish have higher levels of microplastic contamination compared to demersal fish, and the contamination is influenced by habitat depth, type, and fish species.
MARINE POLLUTION BULLETIN
(2022)
Article
Geosciences, Multidisciplinary
Masumi Yamada, Tung-Cheng Ho, Jim Mori, Yasuhiro Nishikawa, Masa-Yuki Yamamoto
Summary: The volcanic eruption in Tonga in 2022 led to an unusual tsunami that differed from conventional volcanic tsunamis. It was caused by the moving atmospheric Lamb wave and traveled at the same speed as the Lamb wave. The tsunami split when passing the continental slope and traveled at the speed of the ocean gravity wave. This type of tsunami, generated by an atmospheric mechanism, should be considered in tsunami warning systems.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Chemistry, Organic
Yayue Wang, Guohua Shen, Jie Li, Wuyu Mao, Hongbao Sun, Ping Feng, Haoxing Wu
Summary: This study reports the bioorthogonal cleavage of methylene tetrazines with ether or ester linkages in the presence of trans-cyclooctene. This approach allows for the controlled release of molecules with phenol or carboxylic acid moieties and has potential applications in various biomedical fields.
Article
Geosciences, Multidisciplinary
Tatsuya Kubota, Tatsuhiko Saito, Naotaka Y. Chikasada, Osamu Sandanbata
Summary: This study introduces an ocean-bottom pressure gauge network, S-net, which can capture small-amplitude meteotsunamis. Through data analysis and numerical simulations, the study demonstrates the validity and limitation of S-net for meteotsunami research. The results suggest that S-net combined with numerical simulations can detect the generation and propagation of meteotsunamis.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Solomon Amoah Owiredu, Kwang-Il Kim, Byung-Yeob Kim
Summary: The sources, distribution, and density of seafloor litter were assessed in the South Sea around Jeju Island. The study revealed a significant level of pollution generated from commercial fishing activities, with derelict gears being the most common litter items.
MARINE POLLUTION BULLETIN
(2022)
Article
Geosciences, Multidisciplinary
Matthew M. Jones, Bradley B. Sageman, David Selby, Andrew D. Jacobson, Sietske J. Batenburg, Laurent Riquier, Kenneth G. MacLeod, Brian T. Huber, Kara A. Bogus, Maria Luisa G. Tejada, Junichiro Kuroda, Richard W. Hobbs
Summary: Large-igneous-province volcanic activity during the mid-Cretaceous triggered a global-scale episode of reduced marine oxygen levels known as Oceanic Anoxic Event 2 approximately 94.5 million years ago. It has been hypothesized that this geologically rapid degassing of volcanic carbon dioxide altered seawater carbonate chemistry, affecting marine ecosystems, geochemical cycles and sedimentation.
Article
Green & Sustainable Science & Technology
Xinyan Xiong, Yi Li, Xinyi Zhou, Chi Zhang
Summary: Anthropogenic deoxygenation of freshwater systems has raised global concern due to its potential threats to biodiversity, nutrient loading, and greenhouse gas emissions. This study developed a new method using oxygen-carrying dual-modified sediment-based biochar to restore hypoxic freshwater and reduce methane emissions. The results showed that the modified biochar significantly increased dissolved oxygen concentration and decreased methane emissions. Microbial analysis indicated that the restored oxygen-rich environment promoted the expression of methane oxidation genes. The study highlights the potential of improving water quality and microbial community reconstruction in reducing greenhouse gas emissions.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Geological
Sergio A. Sepulveda, Brent C. Ward, Scott B. Cosman, Rachel Jacobs
Summary: An intense atmospheric river in mid-November 2021 caused flooding and ground failures in the southern coastal region of British Columbia, damaging major transportation corridors and disrupting land connectivity. This note summarizes slope and riverbank ground failures, focusing on their impact on highways in the Lower Mainland and connecting corridors. Field observations are discussed in the context of potential future similar disasters due to climate change-induced extreme climatic events.
CANADIAN GEOTECHNICAL JOURNAL
(2023)
Article
Geochemistry & Geophysics
Jiarui Liu, Andre Pellerin, Jiasheng Wang, David Rickard, Gilad Antler, Jie Zhao, Zhou Wang, Bo Barker Jorgensen, Shuhei Ono
Summary: The marine sulfate inventory is responsible for roughly half of the organic matter mineralization globally in marine sediments, through microbial sulfate reduction. Multiple sulfur isotope ratios were measured to trace the two different sulfate reduction processes. Different sulfur isotope compositions were found in shelf sediments compared to slope sediments, indicating variations in the processes of sulfate reduction.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Engineering, Geological
Xiangang Jiang, Anders Worman, Xiaoqing Chen, Zhanyuan Zhu, Zuyin Zou, Weimin Xiao, Ping Li, Guojun Liu, Diyin Kang
Summary: This study conducted seepage tests on gravel-sand-clay mixtures with different coarse particle content proportions to investigate the erosion characteristics of debris-flow deposits triggered by seepage flows. The results showed that concentrated leak erosion, internal instability erosion, and piping were observed in the soil with a coarse particle content of 48%-80%. A model coupling seepage and internal erosion was developed to describe internal erosion, and an equation considering pore size distribution and hydraulic gradient was introduced to evaluate the mass of eroded particles. The model was calibrated based on experimental data.
ENGINEERING GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Manfredi Longo, Gianluca Lazzaro, Cinzia Giuseppina Caruso, Vlad Radulescu, Raluca Radulescu, Sergio Simone Scire Scappuzzo, Dominique Birot, Francesco Italiano
Summary: The Black Sea bottom is known for being the earth's largest anaerobic methane source, and monitoring its methane emissions is essential for interdisciplinary studies on global warming. Monitoring campaigns in the Romanian sector of the Black Sea revealed high concentrations of dissolved methane. Acoustic data allowed for discrimination of different degassing mechanisms and styles.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Qingli Qu, Jian Zhang, Xiaoqiong Chen, Hossein Ravanbakhsh, Guosheng Tang, Ranhua Xiong, Bella B. Manshian, Stefaan J. Soenen, Felix Sauvage, Kevin Braeckmans, Stefaan C. De Smedt, Chaobo Huang
Summary: In this study, a bioinspired reactive oxygen species (ROS)-mediated delivery system triggered by light was introduced. The microparticles were designed with a core of cellulose nanocrystals loaded with a drug, surrounded by a light-sensitive shell. By incorporating an FDA-approved photosensitizer in the shell, the microparticles could generate ROS upon NIR laser irradiation for triggered release of the drug encapsulated in the cellulose core.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Geochemistry & Geophysics
J. Edwards, Jared Kluenser, Eli Silver, Rachel Lauer, Nathan Bangs, Brian Boston
Summary: The Costa Rican convergent margin is usually seen as an erosive margin, with estimated average losses of sediment. However, new data suggests that the material transfer at the plate boundary is more complex, with a balance between accretion, underplating, basal erosion, and sediment subduction. These budget results differ significantly from previous estimates based on simpler proxies.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
Miho Asada, Gregory F. Moore, Kiichiro Kawamura, Takuroh Noguchi
Summary: The study investigates a mud volcano located in a fault zone on the southern edge of the Kumano Basin. It differs from mud volcanoes in the northern part and may indicate larger scale fluid and sediment migration. The findings suggest that this mud volcano could play a role in crustal activity.
MARINE GEOPHYSICAL RESEARCH
(2021)
Article
Geochemistry & Geophysics
Garrett Ito, Gregory F. Moore
Summary: This study investigates the structural features of accretionary wedges and fold-and-thrust belts, focusing on the width of crustal blocks bounded by major thrusts. Through numerical models and analytical solutions, it is found that the initial width of a thrust block is determined at the front of the wedge and subsequently decreases with certain factors. The findings provide insights into the factors influencing block width and propose a scaling law to explain these influences.
Article
Geochemistry & Geophysics
Shuoshuo Han, Nathan L. Bangs, Matthew J. Hornbach, Ingo A. Pecher, Harold J. Tobin, Eli A. Silver
Summary: The study presents observations of double bottom simulating reflections (BSRs) along the northern Hikurangi subduction margin in New Zealand, suggesting potential formation mechanisms including rapid sedimentation, tectonic uplift, and overpressure/heat advection caused by fluid migration.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Hannah L. Tilley, Gregory F. Moore, Mikiya Yamashita, Shuichi Kodaira
Summary: Significant variations in the width of the protothrust zone were observed along the Nankai Trough accretionary prism, influenced by the sediment wedge size, lithology, and basement topography. Protothrusts are likely fractures formed during consolidation of trench fill sediment, with strain localization at high-density protothrust sites impacting future frontal thrust propagation locations. The presence and width of the protothrust zone play a key role in the geometry of the accretionary prism.
Article
Geosciences, Multidisciplinary
Richard G. Davy, Laura Frahm, Rebecca Bell, Ryuta Arai, Daniel H. N. Barker, Stuart Henrys, Nathan Bangs, Joanna Morgan, Michael Warner
Summary: Full-waveform inversion (FWI) technology can resolve subsurface physical properties to high resolutions, and high-frequency FWI can directly generate high-fidelity reflection images, which are consistent with conventional reflection images and help to better resolve horizons.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
A. Maksymowicz, E. Contreras-Reyes, D. Diaz, D. Comte, N. Bangs, A. M. Trehu, E. Vera, F. Herve, A. Rietbrock
Summary: The study provides new insights into the deep structure of the continental wedge along the south-central Chilean convergent margin, showing latitudinal variations in P-wave velocity and the presence of deep reflectors. A change in deep structural style near 38 degrees S indicates segmentation in the interplate frictional properties between the Maule and Valdivia earthquakes rupture zones.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
H. Tilley, G. F. Moore, M. B. Underwood, F. J. Hernandez-Molina, M. Yamashita, S. Kodaira, A. Nakanishi
Summary: The study found the presence of contourite mounded drifts in the Shikoku Basin in the Nankai Trough, which may introduce permeability heterogeneities and enhance along-strike fluid transport through more extensive normal faults in mud-dominant units. The variations in seismic behavior along the strike are likely related to the subducting basement topographic and sediment characteristics on a local scale.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geosciences, Multidisciplinary
Dan Bassett, Adrien Arnulf, Stuart Henrys, Dan Barker, Harm Avendonk, Nathan Bangs, Shuichi Kodaira, Hannu Seebeck, Laura Wallace, Andrew Gase, Thomas Luckie, Katie Jacobs, Brook Tozer, Ryuta Arai, David Okaya, Kimi Mochizuki, Gou Fujie, Yojiro Yamamoto
Summary: Marine multichannel and wide-angle seismic data were used to study the crustal structure along a 530 km margin-parallel transect of the Hikurangi subduction zone. The research found that the subducting Hikurangi Plateau crust is about 1 km thicker and has slightly higher mantle velocities beneath the south/central Hikurangi compared to the north Hikurangi. In the overthrusting plate, there is a significant reduction in forearc wavespeeds from south to north, accompanied by a change in seismic reflection character. The study suggests that the geological architecture of the overthrusting plate contributes to spatial variability in the location of shallow frictional transitions along the Hikurangi margin, impacting seismic and tsunami hazard.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Adrien F. Arnulf, Dan Bassett, Alistair J. Harding, Shuichi Kodaira, Ayako Nakanishi, Gregory Moore
Summary: The structures in the upper plate have a significant impact on the geometry, hydration state, and segmentation of large megathrust earthquakes at subduction zones. High forearc wavespeeds and dense, high-rigidity plutons play a crucial role in forcing the subduction of incoming plates. Reduced mantle velocities beneath the region of maximum curvature and faulting may indicate serpentinization of the subducting mantle. The study also highlights the occurrence of large earthquakes originating from the flanks of these plutons.
Article
Geochemistry & Geophysics
Jared W. Kluesner, Eli A. Silver, Nathan L. Bangs, Cesar R. Ranero, Stephanie Nale, James Gibson, Kirk D. McIntosh
Summary: High-resolution bathymetry and seismic data reveal a two-tiered honeycomb pattern of seafloor depressions along the Cocos Ridge. The deeper depressions formed due to sediment collapse, while the shallower depressions formed as a result of fluid flow and bottom current scouring. The formation of these depressions can be traced back to the late Miocene and the Pliocene-Pleistocene transition.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geology
Andrew C. Gase, Nathan L. Bangs, Harm J. A. Van Avendonk, Dan Bassett, Stuart A. Henrys
Summary: Using multichannel seismic images, this study reveals a correlation between the lithologic homogeneity of subduction megathrusts and their slip behavior, and finds that different regions of the megathrust exhibit different slip behaviors due to variations in rock compositions.
Article
Geochemistry & Geophysics
Dan Bassett, Adrien Arnulf, Shuichi Kodaira, Ayako Nakanishi, Alistair Harding, Gregory Moore
Summary: By integrating two-decades of onshore-offshore, ocean-bottom seismometer, and passive-source data, this study provides high-resolution 3-D constraints on the architecture of the Nankai subduction zone. The results reveal significant variability in the width of the outer-forearc and the location of the crustal backstop, which have implications for shallow slow-earthquakes and co-seismic slip. The study also highlights the influence of crustal-scale architecture on the width and behavior of the seismogenic zone at Nankai Trough.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
Nathan L. Bangs, Julia K. Morgan, Rebecca E. Bell, Shuoshuo Han, Ryuta Arai, Shuichi Kodaira, Andrew C. Gase, Xinming Wu, Richard Davy, Laura Frahm, Hannah L. Tilley, Daniel H. N. Barker, Joel H. Edwards, Harold J. Tobin, Tim J. Reston, Stuart A. Henrys, Gregory F. Moore, Dan Bassett, Richard Kellett, Valerie Stucker, Bill Fry
Summary: When large seamounts collide with the overriding plate at subduction zones, it causes permanent deformation and creates structural and compositional heterogeneities that can control megathrust slip behavior. Subducting seamounts can either temporarily lock plates, leading to large earthquakes, or redistribute stress to reduce seismic slip. Three-dimensional seismic data from the Hikurangi Plateau off the coast of New Zealand's North Island reveals that the presence of seamounts uplift the overriding plate and leave sediment lenses in their wake, with low seismic velocities and overpressured fluid-rich sediments. These sediment lenses create zones that enable slow slip, as seen in the 2014 slow-slip earthquake event. This study suggests that sediment lenses left behind by subducting seamounts can maintain long-lasting fluid pressures and support slow-slip behavior at sediment-rich subduction zones.
Article
Multidisciplinary Sciences
Andrew C. Gase, Nathan L. Bangs, Demian M. Saffer, Shuoshuo Han, Peter K. Miller, Rebecca E. Bell, Ryuta Arai, Stuart A. Henrys, Shuichi Kodaira, Richard Davy, Laura Frahm, Daniel H. N. Barker
Summary: This article investigates the relationship between slow slip, fluid content, and hydrogeology in subduction zones. Through seismic imaging and ocean drilling, a widespread and previously unknown fluid reservoir was discovered at the Hikurangi margin. The research suggests that the volcaniclastic-rich upper crust at volcanic plateaus and seamounts is a major source of water that contributes to fluid budgets in subduction zones and may drive fluid overpressures along the megathrust that give rise to frequent shallow slow slip.