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Avedik, Félix; Renard, Vincent; Buisine, Didier; Cornic, Jean-yves. |
This paper describes a pop-up ocean bottom seismograph designed primarily for refraction surveys both on the continental shelf and in deep sea. Its development is the extension of our system based on seismic detectors located on the sea floor with radio transmission of seismic signals and used for seismic refraction studies on the continental shelf. The seismic detectors (vertical geophone or hydrophone and two orthogonally mounted horizontal geophones) are located outside of the pressure vessel on the main frame. Optionally, the seismic sensors may be decoupled from the main frame assembly.This decoupling is performed by a mobile arm positioning the separate three component sensor package on the sea floor. [NOT CONTROLLED OCR] |
Tipo: Text |
Palavras-chave: Histoire Ifremer. |
Ano: 1978 |
URL: http://archimer.ifremer.fr/doc/1978/publication-5174.pdf |
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Avedik, Félix; Howard, David. |
Seismic refraction studies over the Meriadzek-Trevelyan area in the north of the Bay of Biscay have established four main geological sequences : Cenozoic (1.9 to 2.8 km/s) ; Cretaceous (3.2 to 4.0 km/s); lower to middle Mesozoic (4.5 to 5.0 km/s) ; pre-Mesozoic (5.4 to 6.3 km/s). These agree broadly with the adjoining Western Approaches and English Channel areas to the northeast. The sub-sedimentary structure between the Meriadzek Terrace and the Trevelyan escarpment is of continental origin having a block-faulted pattern and is interpreted as a southwestward prolongation of the continental structure. The blockfaulted form is considered to have originated during the rifting of the Armorican Continental margin and may have been influenced by a tectonic... |
Tipo: Text |
Palavras-chave: Histoire Ifremer. |
Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/1979/publication-5247.pdf |
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