Results 161 to 170 of about 6,547 (194)

Tectonic structures on the Juan de Fuca Ridge

Geological Society of America Bulletin, 1977
The northern Juan de Fuca Ridge is an actively spreading part of the East Pacific Rise system that is flooded with young turbidite sediments from the nearby continental margin. A detailed geophysical survey was completed at the intersection of the ridge with the Sovanco Fracture Zone.
E. E. DAVIS, C.R.B. LISTER
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Hydrothermal effects west of the Juan de Fuca Ridge

Deep Sea Research Part I: Oceanographic Research Papers, 1993
The Juan de Fuca Ridge in the northeast Pacific Ocean is a region of extensive hydrothermal activity, and plumes emanating from the ridge can be dispersed by the oceanic circulation at about 2000 m. Off-axis temperature-salinity characteristics and water-property maps suggest a history of variability in hydrothermal activity on the ridge.
Glenn A. Cannon, David J. Pashinski, Michael R. Lemon   +2 more
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Introduction to Juan de Fuca Ridge Special Section

Journal of Geophysical Research: Solid Earth, 1987
The U.S. Geological Survey and several other institutions have been studying the southernmost segment of the Juan de Fuca Ridge for several years by almost every means available to marine geologists and geophysicists [e.g., Normark et al., this issue].
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Hydrothermal particle plumes over the southern Juan de Fuca Ridge

Nature, 1985
Hydrothermal particles originate in buoyant plumes emanating from seafloor thermal vents1–4 and accumulate as metalliferous sediments found along oceanic spreading centres5–7. Observational evidence of the transport pathway of hydrothermal particles is scarce, however, and the structure, extent and particle concentrations of hydrothermal plumes remain ...
Edward T. Baker, J. William Lavelle, Gary J. Massoth   +2 more
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Magnetic structure of the Juan de Fuca-Gorda Ridge Area

Journal of Geophysical Research, 1969
By using the fracture pattern deduced by N. Pavoni (1966) with a different interpretation of the magnetic anomaly lineations, a reconstruction can be made in which the Juan de Fuca and Gorda ridges form a single, continuous, north-south trending feature. From this reconstruction, the present magnetic structural pattern can be derived by (1) development
George Peter, Robert Lattimore
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A microseismicity survey of Axial Seamount, Juan de Fuca Ridge

Bulletin of the Seismological Society of America, 1987
Abstract An array of ocean bottom seismometers and hydrophones were deployed within the caldera of Axial Seamount, located at the intersection of the Cobb-Eickelberg Seamount Chain and the Juan de Fuca Ridge. Recent manned submersible dives have discovered the presence of two distinct hydrothermal vent fields.
R. S. Jacobson, L. D. Bibee, R. W. Embley, S. R. Hammond   +3 more
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The magnetic structure of Axial Seamount, Juan de Fuca Ridge

Journal of Geophysical Research: Solid Earth, 1990
Axial Seamount is a large, volcanically active seamount located in the eastern Pacific on the central Juan de Fuca (JDF) ridge at 46°N, 130′W. Sea surface magnetic anomaly data show that Axial lies completely within crust formed during the Brunhes normal polarity epoch.
Maurice A. Tivey, H. Paul Johnson
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Heat flow west of the Juan de Fuca Ridge

Journal of Geophysical Research, 1970
Fifteen new heat-flow measurements have been made as part of a general geophysical study west of the Juan de Fuca ridge. All but one are within 16 km of latitude 47°N, and they form a profile from the crest of the ridge to a point out on the Tufts abyssal plain.
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EMRIDGE: The electromagnetic investigation of the Juan de Fuca Ridge

Marine Geophysical Researches, 1993
From July to November 1988, a major electromagnetic (EM) experiment, known as EMRIDGE, took place over the southern end of the Juan de Fuca Ridge in the northeast Pacific. It was designed to complement the previous EMSLAB experiment which covered the entire Juan de Fuca Plate, from the spreading ridge to subduction zone.
G. S. Heinson, A. White, L. K. Law, Y. Hamano, H. Utada, T. Yukutake, J. Segawa, H. Toh   +7 more
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Water column hydrothermal plumes on the Juan de Fuca Ridge

Journal of Geophysical Research: Solid Earth, 1990
Hydrographic surveys on the Juan de Fuca Ridge (JdFR) carried out from 1980 to 1987 show a complex pattern of 3He and Mn‐rich water column plumes produced by venting from several submarine hot spring areas. In the vicinity of Axial Volcano at latitude 46°N, distinct plumes were detected in 1980, 1982, and 1983 with3He signatures up to δ(3He) = 64% at ...
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