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Article
Jean-Claude Sibuet: A dedicated editor of Marine Geophysical Researches
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Article
Evolution of magma-poor continental margins from rifting to seafloor spreading
The rifting of continents involves faulting (tectonism) and magmatism, which reflect the strain-rate and temperature dependent processes of solid–state deformation and decompression melting within the Earth1,2. M...
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Article
Synthesis of the crustal structure of the transform continental margin off Ghana, northern Gulf of Guinea
Results of a detailed geophysical transect across the transform continental margin off Ghana, at the eastern end of the Romanche Fracture Zone in the Equatorial Atlantic, are presented. Seismic refraction, si...
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Article
A technique for conducting seismic refraction experiments on the ocean bed using bottom shots
A technique has been devised for firing arrays of bottom shots on the ocean bed in depths upto 4000 m or more. Ten kilogram explosive charges are dropped from the surface while the shooting ship is navigated a...
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Chapter
In Situ Measurements of Shear-Wave Velocity in Ocean Sediments
This paper presents shear-wave results from the Northeast Atlantic and from the Norwegian Sea. In the first case a link was established between shear-wave velocity and sediment lithification from constraints i...
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Chapter
Observations of Split Shear-Waves from Young Ocean Crust
Pressure waves generated by an airgun source give rise to converted shear-waves at the sea-floor interface. Such shear-waves, turning through young oceanic crust, have been recorded by an array of digital OBS’...
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Chapter
Ocean-Bottom Seismographs
This paper describes both examples of data obtained with ocean- bottom seismographs and the different sorts of instrument which record such data. The data include recordings of controlled sources (explosions a...
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Article
A three-component ocean bottom seismograph for controlled source and earthquake seismology
A three-component pop-up ocean-bottom seismograph was built at the Institute of Oceanographic Sciences in 1978. It is constructed around a buoyant 71 cm diam aluminium alloy forged sphere which contains three ...
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Article
Geophysical controversy in the Gulf of Aden
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Article
Pop-up bottom seismic recorder (PUBS) of the Institute of Oceanographic Sciences, U.K.
A pop-up bottom seismic recorder designed for seismic refraction experiments was built by the Institute of Oceanographic Sciences in 1968. The device is housed within a 71 cm diameter sphere weighing 270 kg wh...
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Article
The fault pattern of a slow-spreading ridge near a fracture zone
IN July, 1973 a 30,000 km2 area of the median valley and crest of the Mid-Atlantic Ridge near 37 °N (Fig. 1) was surveyed with the long range side-scan sonar, GLORIA1. A mosaic of overlap** sonographs was produ...
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Chapter and Conference Paper
The Azores-Gibraltar Plate Boundary
Between the Azores and Gibraltar there is a belt of earthquakes which, with its eastward extension into the Mediterranean, marks the boundary between the African and Eurasian plates. There is no offset of the ...
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Article
Median Valley Refraction Line, Mid-Atlantic Ridge at 37° N
THIS communication describes the results of a reversed seismic refraction line carried out with explosives and seabed receivers in the median valley of the Mid-Atlantic Ridge during July and August 1973. The w...
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Article
A Continuous East-West Fault on the Azores-Gibraltar Ridge
A continuous east–west reflector has been observed with long range side-scan sonar, extending along the Azores–Gibraltar Ridge from Santa Maria Is. to a point 400 km to the east. From the continuity, narrownes...
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Article
Seismic Anisotropy of the Uppermost Mantle beneath Mid-ocean Ridges
IN 1965, Hess1 showed that seismic refraction measurements of Raitt and Shor in the East Pacific were consistent with seismic anisotropy of the uppermost mantle. Velocities between 8.0 km/s and 8.7 km/s were meas...
