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  • 1
    Keywords: Oceanography. ; Water. ; Hydrology. ; Cogeneration of electric power and heat. ; Fossil fuels. ; Geology. ; Physical geography. ; Business. ; Management science. ; Ocean Sciences. ; Water. ; Fossil Fuel. ; Geology. ; Earth System Sciences. ; Business and Management.
    Description / Table of Contents: Part I. A History of gas hydrate research -- Chapter 1. Gas Hydrate Research: From the Laboratory to the Pipeline -- Chapter 2. Shallow gas hydrates near 64° N, off Mid-Norway: Concerns regarding drilling and production technologies -- Chapter 3. Finding and using the world’s gas hydrates -- Part II. Gas Hydrate Fundamentals -- Chapter 4. Seismic rock physics of gas-hydrate bearing sediments -- Chapter 5. Estimation of gas hydrates in the pore space of sediments using inversion methods -- Chapter 6. Electromagnetic applications in methane hydrate reservoirs -- Part III. Gas Hydrate Drilling for Research and Natural Resources -- Chapter 7. Hydrate Ridge - A gas hydrate system in a subduction zone setting -- Chapter 8. Northern Cascadia Margin gas hydrates – Regional geophysical surveying, IODP drilling Leg 311 and cabled observatory monitoring -- Chapter 9. Accretionary wedge tectonics and gas hydrate distribution in the Cascadia forearc -- Chapter 10. Bottom Simulating Reflections below the Blake Ridge, western North Atlantic Margin -- Chapter 11. A review of the exploration, discovery, and characterization of highly concentrated gas hydrate accumulations in coarse-grained reservoir systems along the Eastern Continental Margin of India -- Chapter 12. Ulleung Basin Gas Hydrate Drilling Expeditions, Korea: Lithologic characteristics of gas hydrate-bearing sediments -- Chapter 13. Bottom simulating reflections in the South China Sea -- Chapter 14. Gas hydrate and fluid related seismic indicators across the passive and active margins off SW Taiwan -- Chapter 15. Gas Hydrate Drilling in the Nankai Trough, Japan -- Chapter 16. Alaska North Slope Terrestrial Gas Hydrate Systems: Insights from Scientific Drilling -- Part IV -- Arctic -- Chapter 17. Gas Hydrates on Alaskan Marine Margins -- Chapter 18. Gas Hydrate related bottom-simulating reflections along the west-Svalbard margin, Fram Strait -- Chapter 19. Occurrence and distribution of bottom simulating reflections in the Barents Sea -- Chapter 20. Svyatogor Ridge - A gas hydrate system driven by crustal scale processes -- Chapter 21. Gas hydrate potential in the Kara Sea -- Part V. Greenland and Norwegian Sea -- Chapter 22. Geophysical indications of gas hydrate occurrence on the Greenland continental margins -- Chapter 23. Gas hydrates in the Norwegian Sea -- Part VI. North Atlantic. Chapter 24. U.S. Atlantic Margin Gas Hydrates -- Chapter 25. Gas Hydrates and submarine sediment mass failure: A case study from Sackville Spur, offshore Newfoundland -- Chapter 26. Bottom Simulating Reflections and Seismic Phase Reversals in the Gulf of Mexico -- Chapter 27. Insights into gas hydrate dynamics from 3D seismic data, offshore Mauritania -- Part VII. South Atlantic -- Chapter 28. Distribution and Character of Bottom Simulating Reflections in the Western Caribbean Offshore Guajira Peninsula, Colombia -- Chapter 29. Gas hydrate systems on the Brazilian continental margin -- Chapter 30. Gas hydrate on the southwest African continental margin -- Chapter 31. Shallow gas hydrates associated to pockmarks in the Northern Congo deep-sea fan, SW Africa -- Part VIII. Pacific -- Chapter 32. Gas hydrate-bearing province off eastern Sakhalin slope -- Chapter 33. Tectonic BSR Hypothesis in the Peruvian margin: A forgotten way to see marine gas hydrate systems at convergent margins -- Chapter 34. Gas hydrate and free gas along the Chilean Continental Margin -- Chapter 35. New Zealand’s Gas Hydrate Systems -- Part IX. Indic -- Chapter 36. First evidence of bottom simulation reflectors in the western Indian Ocean offshore Tanzania -- Part X. Mediterranean Sea -- Chapter 37. A Gas Hydrate System of Heterogenous Character in the Nile Deep-Sea Fan -- Part XI. Black Sea -- Chapter 38. Gas hydrate accumulations in the Black Sea -- Part XII. Lake Baikal -- Chapter 39. The position of gas hydrates in the sedimentary strata and in the geological structure of Lake Baikal -- Part XIII. Antarctic -- Chapter 40. Bottom Simulating Reflector in the western Ross Sea Antarctica -- Chapter 41. Bottom Simulating Reflectors along the Scan Basin, a deep-sea gateway between the Weddell Sea (Antarctica) and Scotia Sea -- Chapter 42. Bottom Simulating Reflections in Antarctica -- Part XIV. Where Gas Hydrate Dissociates Seafloor Microhabitats Flourish. Chapter 43. Integrating fine-scale habitat mapping and pore water analysis in cold seep research: A case study from the SW Barents Sea.
    Abstract: This world atlas presents a comprehensive overview of the gas-hydrate systems of our planet with contributions from esteemed international researchers from academia, governmental institutions and hydrocarbon industries. The book illustrates, describes and discusses gas hydrate systems, their geophysical evidence and their future prospects for climate change and continental margin geohazards from passive to active margins. This includes passive volcanic to non-volcanic margins including glaciated and non-glaciated margins from high to low latitudes. Shallow submarine gas hydrates allow a glimpse into the past from the Last Glacial Maximum (LGM) to modern environmental conditions to predict potential changes in future stability conditions while deep submarine gas hydrates remained more stable. This demonstrates their potential for rapid reactions for some gas hydrate provinces to a warming world, as well as helping to identify future prospects for environmental research. Three-dimensional and high-resolution seismic imaging technologies provide new insights into fluid flow systems in continental margins, enabling the identification of gas and gas escape routes to the seabed within gas hydrate environments, where seabed habitats may flourish. The volume contains a method section detailing the seismic imaging and logging while drilling techniques used to characterize gas hydrates and related dynamic processes in the sub seabed. This book is unique, as it goes well beyond the geophysical monograph series of natural gas hydrates and textbooks on marine geophysics. It also emphasizes the potential for gas hydrate research across a variety of disciplines. Observations of bottom simulating reflectors (BSRs) in 2D and 3D seismic reflection data combined with velocity analysis, electromagnetic investigations and gas-hydrate stability zone (GHSZ) modelling, provide the necessary insights for academic interests and hydrocarbon industries to understand the potential extent and volume of gas hydrates in a wide range of tectonic settings of continental margins. Gas hydrates control the largest and most dynamic reservoir of global carbon. Especially 4D, 3D seismic but also 2D seismic data provide compelling sub-seabed images of their dynamical behavior. Sub-seabed imaging techniques increase our understanding of the controlling mechanisms for the distribution and migration of gas before it enters the gas-hydrate stability zone. As methane hydrate stability depends mainly on pressure, temperature, gas composition and pore water chemistry, gas hydrates are usually found in ocean margin settings where water depth is more than 300 m and gas migrates upward from deeper geological formations. This highly dynamic environment may precondition the stability of continental slopes as evidenced by geohazards and gas expelled from the sea floor. This book provides new insights into variations in the character and existence of gas hydrates and BSRs in various geological environments, as well as their dynamics. The potentially dynamic behavior of this natural carbon system in a warming world, its current and future impacts on a variety of Earth environments can now be adequately evaluated by using the information provided in the world atlas. This book is relevant for students, researchers, governmental agencies and oil and gas professionals. Some familiarity with seismic data and some basic understanding of geology and tectonics are recommended.
    Type of Medium: Online Resource
    Pages: XXI, 514 p. 309 illus., 294 illus. in color. , online resource.
    Edition: 1st ed. 2022.
    ISBN: 9783030811860
    DDC: 551.46
    Language: English
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  • 2
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    In:  J. Geophys. Res., Dordrecht, D. Reidel, vol. 110, no. B8, pp. 4-21, pp. B08402, (ISSN: 1340-4202)
    Publication Date: 2005
    Keywords: Structural geology ; Tectonics ; Plate tectonics ; Earthquake hazard ; China ; JGR
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  • 3
    Publication Date: 2013-12-08
    Description: [1]  We use offshore multi-channel seismic (MCS) reflection and wide-angle seismic data sets to model the velocity structure of the incipient arc-continent-collision along two, trench perpendicular transects in the Bashi Strait between Taiwan and Luzon. This area represents a transition from a tectonic regime dominated by subduction of oceanic crust of the South China Sea (SCS) west of the Philippines to one dominated by subduction and eventual collision of rifted Chinese continental crust with the Luzon volcanic arc culminating in the Taiwan orogeny. The new seismic velocity models show evidence for extended to hyper-extended continental crust, ~10-15 km thick, subducting along the Manila trench at 20.5° N along transect T1, as well as evidence indicating that this thinned continental crust is being structurally underplated to the accretionary prism at 21.5° N along transect T2, but not along T1 to the south. Coincident MCS reflection imaging shows highly stretched and faulted crust west of the trench along both transects and what appears to be a mid-crustal detachment along transect T2, a potential zone of weakness that may be exploited by accretionary processes during subduction. An additional seismic reflection transect south of T1 shows subduction of normal ocean crust at the Manila trench.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 4
    Publication Date: 2017-07-16
    Description: To systematically quantify the production, consumption and migration of methane along a continental margin, 210 sediment cores were collected from offshore southwestern Taiwan and analyzed for their gas and aqueous geochemistry. These data, combined with published results, were used to calculate the diffusive methane fluxes across different geochemical transitions and to develop scenarios of mass balance to constrain deep microbial and thermogenic methane production rates within the accretionary prism. The results showed that methane diffusive fluxes ranged from 2.71 × 10 −3 to 2.78 × 10 −1 and from ‒1.88 × 10 −1 to 3.97 mmol m −2 d −1 at the sulfate-methane-transition-zone (SMTZ) and sediment-seawater interfaces, respectively. High methane fluxes tend to be associated with structural features, suggesting a strong structural control on the methane transport. A significant portion of ascending methane (〉50%) is consumed by anaerobic oxidation of methane at the SMTZ at most sites, indicating effective biological filtration. Gas compositions and isotopes revealed a transition from the predominance of microbial methane in the passive margin to thermogenic methane at the upper slope of the active margin and onshore mud volcanoes. Methane production and consumption at shallow depths were nearly offset with a small fraction of residual methane discharged into seawater. The flux imbalance arose primarily due to the larger production of methane through deep microbial and thermogenic processes at a magnitude of 1,512 – 43,096 Tg Myr −1 methane and could be likely accounted for by the sequestration of methane into hydrate forms, and clay absorption.
    Electronic ISSN: 1525-2027
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 5
    Publication Date: 2024-01-12
    Description: The Formosa Ridge cold seep is among the first documented active seeps on the northern South China Sea passive margin slope. Although this system has been the focus of scientific studies for decades, the geological factors controlling gas release are not well understood due to a lack of constraints of the subsurface structure and seepage history. Here, we use high‐resolution 3D seismic data to image stratigraphic and structural relationships associated with fluid expulsion, which provide spatio‐temporal constraints on the gas hydrate system at depth and methane seepage at modern and paleo seafloors. Gas has accumulated beneath the base of gas hydrate stability to a critical thickness, causing hydraulic fracturing, propagation of a vertical gas conduit, and morphological features (mounds) at paleo‐seafloor horizons. These mounds record multiple distinct gas migration episodes between 300,000 and 127,000 years ago, separated by periods of dormancy. Episodic seepage still seems to occur at the present day, as evidenced by two separate fronts of ascending gas imaged within the conduit. We propose that episodic seepage is associated with enhanced seafloor sedimentation. The increasing overburden leads to an increase in effective horizontal stress that exceeds the gas pressure at the top of the gas reservoir. As a result, the conduit closes off until the gas reservoir is replenished to a new (greater) critical thickness to reopen hydraulic fractures. Our results provide intricate detail of long‐term methane flux through sub‐seabed seep systems, which is important for assessing its impact on seafloor and ocean biogeochemistry.
    Description: Plain Language Summary: Gas hydrates are ice‐like compounds that form in marine sediments. They can reduce the permeability of the sediments by clogging up the pore spaces, and influence how methane gas flows through sediments and then seeps out of the seafloor. Seepage of methane into the water column plays an important role in seafloor biology and ocean chemistry. In this study, we use 3D seismic imaging to investigate the subseafloor sediments of a ridge in the South China Sea where gas is currently seeping into the ocean. Our data show, in high detail, how gas migrates upward through the sediments due to the buoyancy of gas. Our data also reveal mound structures at certain depths beneath the seafloor. We interpret that these mounds represent distinct phases in the geological past where gas was seeping out of the seafloor. This indicates that gas seepage at this ridge has switched on and off (episodically) throughout geological time. We speculate that the episodic seepage is associated with rapid seafloor sedimentation, which changes pressure conditions beneath the seafloor. Our work improves the understanding of how gas seepage processes can change on geological timescales.
    Description: Key Points: Gas has accumulated beneath the base of gas hydrate stability, causing vertical gas conduit formation and seabed mounds. Mounds imaged within the conduit record episodic seepage between 300 and 127 kyrs ago. Quiescence may be associated with enhanced seafloor sedimentation that increases effective stress at the top of the gas reservoir.
    Description: MOST
    Description: ESAS
    Description: TEC
    Description: https://doi.pangaea.de/10.1594/PANGAEA.913192
    Keywords: ddc:553.1 ; gas hydrate ; gas conduit ; hydraulic fracturing ; episodic venting ; sedimentary processes ; offshore Taiwan
    Language: English
    Type: doc-type:article
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  • 6
    Publication Date: 2023-05-12
    Keywords: Area/locality; Conductivity, average; ELEVATION; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Sample, optional label/labor no; Temperature gradient
    Type: Dataset
    Format: text/tab-separated-values, 182 data points
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  • 7
    Publication Date: 2023-06-01
    Keywords: Area/locality; Conductivity, average; ELEVATION; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Sample, optional label/labor no; Temperature gradient
    Type: Dataset
    Format: text/tab-separated-values, 97 data points
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  • 8
    Publication Date: 2023-05-12
    Keywords: Area/locality; Conductivity, average; ELEVATION; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Sample, optional label/labor no; Temperature gradient
    Type: Dataset
    Format: text/tab-separated-values, 160 data points
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  • 9
    Publication Date: 2024-06-26
    Description: This is a dataset that has been acquired in 1995 as part of the U.S.-ROC Deep Seismic Imaging Study of the Taiwan Arc-Continent Collision (TAICRUST) project. This particular line was measured in the Taiwan Strait in September 1995 to image the shallow sediments and upper crust. Additional information from the Cruise EW9509 is stored at the Marine Geoscience Data System (MGDS).
    Keywords: Binary Object; EW9509; EW9509_Line38; Maurice Ewing; multi-channel seismic reflection; raw data; SEIS; Seismic
    Type: Dataset
    Format: text/tab-separated-values, 19 data points
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  • 10
    Publication Date: 2022-05-25
    Description: Author Posting. © The Authors, 2009. This article is posted here by permission of John Wiley & Sons for personal use, not for redistribution. The definitive version was published in Geophysical Journal International 179 (2009): 1859-1869, doi:10.1111/j.1365-246X.2009.04391.x.
    Description: A broad-band ocean-bottom seismometer (OBS) deployed ~180 km east of Taiwan provides a first glimpse into the upper mantle beneath the westernmost section of the Philippine Sea or the Huatung basin (HB). We measured interstation phase velocities of Rayleigh waves between the OBS and stations on the eastern coast of Taiwan. The phase velocities show smooth variations from 3.8 to 3.9 km s−1 for periods of 25–40 s. In this short period range, phase velocities are comparable to those characterizing the 15–30 Ma Parece-Vela basin of the Philippine Sea. Modelling of the finite-frequency effect proves the validity of the measurement for the average HB. The shear-wave velocity models inverted from the 25 to 40 s dispersion show a velocity at lithospheric depths about 0.1 km s−1 lower than that of the west Philippine Sea, which agrees with the age effect derived from the Pacific pure-path model. Inversions incorporating the less reliable data above 40 s yield a shear velocity 〈4.0 km s−1 below 150 km, an unrealistic value even for a hotspot plume environment. The seismological evidence, together with the correlation in seafloor depth, suggests that the HB and the Parece-Vela basin may have a similar age. This is at odds with the previous geochronological study suggesting an early-Cretaceous age for the HB. Thermal rejuvenation of the lithosphere was examined as a potential solution to reconciling the two age models.
    Description: The research is supported by the National Science Council, Taiwan, Republic of China, under grant NSC 96–2745-M-001–005.
    Keywords: Surface waves and free oscillations ; Wave propagation ; Continental margins: convergent ; Dynamics of lithosphere and mantle
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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