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Spatial distribution of hotspot material added to the lithosphere under La Reunion, from wide-angle seismic data ArchiMer
Charvis, Philippe; Laesanpura, Agus; Gallart, Josep; Hirn, Alfred; Lepine, Jean-claude; De Voogd, Beatrice; Minshull, Tim A.; Hello, Yann; Pontoise, Bernard.
Wide-angle seismic lines recorded by ocean bottom and land seismometers provide a pseudo three-dimensional investigation of the crust and upper mantle structure around the volcanically active hotspot island of La Reunion. The submarine part of the edifice has fairly low seismic velocities, without evidence for intrusives. An upper unit with a velocity-depth gradient is interpreted as made of material erupted subaerially then transported and compacted downslope. Between this unit and the top of the oceanic plate, imaged by normal incidence seismic reflection, a more homogeneous unit indicated by shadow zones on several wide-angle sections may correspond to lavas of a different nature, extruded underwater in the earlier phase of volcanism. Coincident wide...
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Ano: 1999 URL: https://archimer.ifremer.fr/doc/00147/25828/36822.pdf
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Evidence from three-dimensional seismic tomography for a substantial accumulation of gas hydrate in a fluid-escape chimney in the Nyegga pockmark field, offshore Norway ArchiMer
Plaza-faverola, Andreia; Westbrook, Graham K.; Ker, Stephan; Exley, Russell J. K.; Gailler, Audrey; Minshull, Tim A.; Broto, Karine.
In recent years, it has become evident that features commonly called gas chimneys provide major routes for methane to pass through the methane-hydrate stability zone in continental margins and escape to the ocean. One of many such chimneys lying beneath pockmarks in the southeastern Voring Plateau off Norway was investigated with a high-resolution seismic experiment employing a 2-D array of sixteen 4-component ocean bottom seismic recorders at approximately 100 m separation and a dense network of shots to define the 3-D variation of the chimney's structure and seismic properties. The tomographic model derived from P wave travel times shows that P wave velocity inside the chimney is up to 300 m/s higher than in the surrounding strata within the...
Tipo: Text Palavras-chave: Travel time tomography; Mid norwegian margin; Storegga slide; Bearing sediments; Voring plateau; Reflection tomography; Continental margins; Marine sediments; Atlantic margin; Velocity models.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00012/12326/9111.pdf
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