Results 181 to 190 of about 6,578 (212)

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +1 more source

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 ...
openaire   +1 more source

Asymmetric deep crustal structure across the Juan de Fuca Ridge

Geology, 1988
A multichannel line was shot across the Endeavour segment of the Juan de Fuca Ridge. Careful processing of 25 km of the line centered about the rise axis shows that young crustal structure is asymmetric. An intermittent reflector from the top 1 km of crust follows topography on both the Pacific and the Juan de Fuca plates. It could be either the pillow
K.M.M. Rohr, B. Milkereit, C. J. Yorath
openaire   +1 more source

The distribution of geothermal fields on the Juan de Fuca Ridge

Journal of Geophysical Research: Solid Earth, 1985
Near bottom water temperatures were mapped along 400 km of the strike of the Juan de Fuca Ridge as part of a combined Sea MARC/Seabeam experiment to image the variability of morphology and structure along a spreading center segment. The water temperature data collected by a continuously towed thermistor chain, in addition to salinity data, indicate ...
Kathleen Crane, Frank Aikman, Robert Embley, Steve Hammond, Alexander Malahoff, John Lupton   +5 more
openaire   +1 more source

Detailed heat flow measurements over the Juan de Fuca Ridge System

Journal of Geophysical Research: Solid Earth, 1980
Eleven detailed profiles of heat flow measurements have been completed over young oceanic crust of the Juan de Fuca ridge system. Individual measurements were spaced typically 0.4–1 km apart along multiple‐penetration lines from 3 to 20 km in total length, and each measurement was located with respect to structural and sedimentary features by ...
E. E. Davis, C. R. B. Lister, U. S. Wade, R. D. Hyndman   +3 more
openaire   +1 more source