Results 181 to 190 of about 2,697 (210)

P-wave velocity anisotropy in an active methane venting pockmark: The Scanner Pockmark, northern North Sea

2020
<p>Scanner pockmark is an active and continuous methane venting seafloor depression of ~ 900 x 450 m wide and 22 m deep. It is located in the northern North Sea, within the Witch Ground basin where the seafloor and shallow sediments are heavily affected by pockmarks and paleo-pockmarks of various sizes.
Gaye Bayrakci, Timothy A. Minshull, Jonathan M. Bull, Timothy J. Henstock, Giuseppe Provenzano, Hamza Birinci, Calum Macdonald, Robert Dunn   +7 more
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Evaluating the Hazard Potential of Pockmarks

OCEANS 81, 1981
Shallow crater-like depressions called pockmarks are known to occur in many parts of the world. Interest in pockmarks has been aroused by uncertainty of their exact mode and rate of formation, and the possibility that they might pose a threat to offshore installations.
openaire   +1 more source

Giant pockmarks in a carbonate platform (Maldives, Indian Ocean)

Marine Geology, 2011
Circular structures and depressions in carbonate platforms are known to represent karst chimneys or sinkholes which form as a response to rock solution. This formation mechanism is plausible for shallow-water carbonates which lie in the reach of meteoric diagenesis or fresh-water lenses.
Betzler, C., Lindhorst, S., Hübscher, C., Lüdmann, T., Fürstenau, J., Reijmer, J.J.G.   +5 more
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Pockmarks of the Northwestern Arabian Gulf

1986
Pockmarks are natural bottom features, unrelated to production activities. Physical evidence for the origin of pockmarks from three sites in the northwestern Arabian Gulf is examined. Three related features are also discussed. Two sources of gases are suggested by the physical evidence.
Jeffrey P. Ellis, William T. McGuinness
openaire   +1 more source

Pockmarks in Passamaquoddy Bay, New Brunswick, Canada

Geological Society, London, Memoirs, 2016
Pockmarks are seafloor depressions associated with fluid escape (Judd & Hovland 2007). They proliferate in the muddy seafloors of coastal Gulf of Maine and Bay of Fundy, where they are associated with shallow natural gas likely of biogenic origin (Ussler et al. 2003; Rogers et al. 2006; Wildish et al. 2008).
Brothers, L. L., Legere, C., Hughes Clarke, John E., Kelley, J. T., Barnhardt, W. A., Andrews, B. D., Belknap, D. F.   +6 more
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Pockmarks on the Mendeleev Rise, central Arctic Ocean

Geological Society, London, Memoirs, 2016
Circular to semi-circular crater-like depressions in the seafloor are commonly referred to as pockmarks. Pockmarks were discovered in the 1960s on echo-sounding profiles from the Scotian Shelf, eastern Canada (King & MacLean 1970). While there is no consensus regarding their formation process, pockmarks are in general linked to the removal of soft ...
M. Jakobsson, M. O'Regan
openaire   +1 more source

Formation of pockmarks by pore-water escape

Geo-Marine Letters, 1985
During the course of a North Sea rig site investigation, a number of seabed depressions were observed on side-scan sonar records, some of which may be identified as pockmarks. Others are described as pits. A pockmark evolutionary series is proposed on the basis of all these features with a suggested mechanism which would favor release of pore water ...
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Pockmarks in the floor of Penobscot Bay, Maine

Geo-Marine Letters, 1989
Hundreds of depressions (pockmarks) were found within a 40 square kilometer area of the sea floor near the head of Penobscot Bay, Maine. These roughly circular depressions range in diameter from 10 to 300 meters and extend as much as 30 meters below the surrounding sea floor.
Kathryn M. Scanlon, Harley J. Knebel
openaire   +1 more source

Characteristics of pockmarks in the Norwegian Trench

Marine Geology, 1981
A 3 km wide corridor across the Norwegian Trench was surveyed in detail with high-resolution, side-scan sonar and subbottom profiler (boomer) in order to study pockmarks. The pockmarks in the Norwegian Trench are dish-shaped depressions found in the soft, silty clays.
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Late Miocene Pockmarks in the Danish Central Graben - Origin and Significance

68th EAGE Conference and Exhibition incorporating SPE EUROPEC 2006, 2006
Late Miocene pockmarks have been identified and mapped in 3D seismic surveys covering large parts of the Danish Central Graben. The upper Miocene succession comprises a thick westward progradational wedge of clay, silt and sand grade siliciclastic sediments. The majority of the pockmarks are located in the clay prone toesets.
Andresen, Katrine, Clausen, O.R., Huuse, Mads   +2 more
openaire   +3 more sources