Article
Geosciences, Multidisciplinary
Wei Zhang, Jinqiang Liang, Haijun Qiu, Wei Deng, Miaomiao Meng, Yulin He, Wei Huang, Jin Liang, Lin Lin, Lifeng Wang, Feifei Wang
Summary: Based on seismic data, this paper identifies double bottom simulating reflectors (BSRs) in the northern slope of the Qiongdongnan Basin (QDNB) in the northern South China Sea and explores their relationship with gas hydrate systems. The presence of double BSRs suggests the dynamic accumulation of gas hydrates and free gas, which is significant for the exploration of gas hydrate resources in submarine settings.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Darrell A. Terry, Camelia C. Knapp
Summary: The study demonstrates that single-channel far-offset seismic images are a more reliable and cost-effective method for identifying the presence of marine gas hydrates. By using a non-traditional approach to process seismic data and focusing on the changes in data characteristics, better imaging of the gas/gas hydrate contact is achieved.
INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION
(2021)
Article
Geochemistry & Geophysics
Akash Trivedi, Sudipta Sarkar, Hector Marin-Moreno, Timothy A. Minshull, Pippa L. Whitehouse, Utpal Singh
Summary: This study investigated the mechanisms by which the stability of methane hydrates at the UCS off west Svalbard is influenced by changes in bottom water temperature and sea level. The simulation results suggest that long-term sea level fall will progressively decrease the hydrate stability zone, while a sudden rise in bottom water temperature increases the likelihood of hydrate dissociation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Akash Trivedi, Sudipta Sarkar, Hector Marin-Moreno, Timothy A. Minshull, Pippa L. Whitehouse, Utpal Singh
Summary: This study investigates the impact of temperature and sea level changes on methane hydrates on the upper continental slope west of Svalbard. Two contrasting hypotheses are tested, and it is concluded that recent ocean warming plays a critical role in hydrate dissociation in this area.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Sudipta Sarkar, Manuel Moser, Christian Berndt, Mechthild Doll, Christoph Boettner, Wu-Cheng Chi, Dirk Klaeschen, Christophe Galerne, Jens Karstens, Sonja Geilert, C. Mortera-Gutierrez, Christian Hensen
Summary: Seafloor heat flow variations in the Guaymas Basin are influenced by high sedimentation rates and intrusions of magma. The study shows that sedimentation suppresses lithospheric heat flow, while recent igneous intrusions and fluid flow elevate the surface heat flow significantly.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
W. -L. Hong, T. Pape, C. Schmidt, H. Yao, K. Wallmann, A. Plaza-Faverola, J. W. B. Rae, A. Lepland, S. Bunz, G. Bohrmann
Summary: The seafloor seepage sites along the Vestnesa Ridge off west-Svalbard have been a natural laboratory for studying fluid flow and gas hydrate dynamics. The research conducted in 2016 revealed unique characteristics of gas hydrates, hinting at temperature modification at great depths. Analysis of pore fluid composition also showed the presence of high chloride concentrations, high B/Cl ratios, and isotopic signatures indicating methane supply and decomposition dynamics.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
E. J. M. Maglalang, L. T. Armada, M. C. Santos, K. F. Sayen, C. B. Dimalanta, S-K Hsu, G. P. Yumul Jr
Summary: This study reports the possible occurrence of gas hydrates in the Manila Trench forearc. The presence of BSRs and EARs indicate the potential accumulation of gas hydrates and free gas. Geologic conditions, geothermal gradient, and fluid migration play key roles in gas hydrate formation.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Environmental Sciences
Robert Sobczyk, Patryk Czortek, Bjorn Serigstad, Krzysztof Pabis
Summary: The study assessed the influence of natural and anthropogenic factors on functional diversity of polychaete communities in the Gulf of Guinea. Results showed high species richness and depth-dependent effects on functional richness and evenness. High functional richness in the shallows suggests ecosystem stability and resilience, while lead concentrations impacted community structure at a local scale. The complex set of factors along a depth gradient shapes the functional composition of communities, crucial for future management in the region.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Review
Oceanography
Hubert du Pontavice, Zhuomin Chen, Vincent S. Saba
Summary: This study constructed a high-resolution, long-term bottom temperature product for the northeast U.S. continental shelf by combining three ocean products. The results showed a long-term warming trend in the bottom temperature of the northeast U.S. continental shelf over the past 63 years, with notable variations among seasons and regions.
PROGRESS IN OCEANOGRAPHY
(2023)
Article
Environmental Sciences
Marta Arjona-Camas, Pere Puig, Fabio C. De Leo, Grant Garner, Sarah Paradis, Ruth Duran, Albert Palanques
Summary: Continental margins are important transitional areas for the transport and deposition of particulate matter from the land to the deep ocean. Hydrodynamic processes and fishing activities contribute to resuspension and remobilization of particles, leading to the formation of nepheloid layers. A study off Vancouver Island revealed a well-defined turbidity structure with surface, intermediate, and bottom nepheloid layers. Fishing activities were found to play a role in the advection of suspended sediment particles along the continental slope.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Michael T. Macnaughtan, Ingo A. Pecher, Lorna J. Strachan
Summary: This study examines the causes of widespread BSR gaps near the hinge area of synclines using seismic stratigraphic and structural interpretation. The researchers suggest a tectono-sedimentary model where sedimentation into accretionary wedge synclines leads to an upward migration of the gas hydrate stability, causing the dissociation of gas hydrates and resulting in BSR gaps.
Article
Geosciences, Multidisciplinary
Jinan Guan, Xiaorong Cong, David E. Archer, Lihua Wan, Deqing Liang
Summary: This study investigates the distribution and development potential of stratigraphic-diffusive hydrate reservoirs formed by biogenic methane flowing laterally into hydrate stable zones. Through analysis of the Pearl River Mouth Basin in the northern slope of the South China Sea, the research reveals the accumulation mechanism and distribution pattern of stratigraphic-diffusive methane hydrates in this region, as well as the influence of geological conditions and controlling factors on the evolution process. The two-dimensional model designed in this study effectively depicts the occurrence and accumulation characteristics of stratigraphic-diffusive hydrates, demonstrating their exploration value and exploitation possibility.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Maria Teresa Pedrosa-Gonzalez, Jose Manuel Gonzalez-Vida, Jesus Galindo-Zaldivar, Sergio Ortega, Manuel Jesus Castro, David Casas, Gemma Ercilla
Summary: A modelling approach using a numerical model has provided new insights into the tsunamigenic potentiality of submarine landslides. The study found that tsunami waves triggered by the landslide are mainly influenced by the sliding mechanism and the bathymetry. The direction of propagation and the coastal impact are controlled by local bathymetry.
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
(2022)
Article
Oceanography
M. P. Subeesh, A. S. Unnikrishnan, P. A. Francis
Summary: The study focuses on the dynamics of M-2 internal tides on the shelf and slope off the west coast of India, revealing different characteristics in the shelf and slope regions. Internal tides in the shelf are mainly generated in the regions of shelf breaks and the northern part of the Chagos-Laccadive Ridge, while the slope is dominated by locally-generated and remotely-generated internal tides.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
C. Wylie Poag
Summary: This study presents evidence of two different bolide impacts that had significant disruptive effects on the stratigraphic and depositional processes of the West Florida Platform in the Gulf of Mexico. These impacts caused seismic shaking, ground roll, and impact-generated tsunamis, resulting in the collapse and retreat of the Florida Escarpment, as well as the disruption of shelf beds and sediment redistribution.