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Registros recuperados: 3
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Earth's free oscillations recorded by free-fall OBS ocean-bottom seismometers at the Lesser Antilles subduction zone ArchiMer
Becel, A.; Laigle, Mireille; Diaz, J.; Montagner, J. -p.; Hirn, A..
Three unburied ocean bottom seismometers (OBS) equipped with Trillium 240 s broad-band seismometers recorded spheroidal free oscillations of the Earth out to periods over 1000 s period, for the M = 8.1, April 1, 2007 Solomon Islands earthquake. In contrast to broadband observatories of the global network that operate in quiet continental locations, these instruments were dropped on the several-km thick layer of sediments of the forearc and accretionary wedge of the Lesser Antilles subduction zone. Furthermore, a high ambient noise level due to the ocean surface infragravity waves is expected to cover the frequency band of Earth's normal modes band when recorded at these sites. In spite of these hostile environmental conditions, the frequency of clearly...
Tipo: Text Palavras-chave: Lesser Antilles; Broadband seismology; Free oscillations; Ocean bottom seismometers.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00185/29606/27971.pdf
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Micro-séismicité et processus de fond de mer dans la partie ouest de la Mer de Marmara : nouveaux résultats fondés sur l'analyse des données de sismographes et hydrophones sous-marins ArchiMer
Batsi, Evangelia.
Since the devastating earthquakes of 1999, east of Istanbul, the submerged section of the North Anatolian Fault (NAF), in the Sea of Marmara (SoM) has been intensively monitored, mainly using land stations. Still, the micro-seismicity remains poorly understood. In addition, although the connection of the SoM with the hydrocarbon gas system from the Thrace Basin is now well established, along with the presence of widespread gas within the sedimentary layers, the role of gas on seismicity is still not recognized.Here, we have analyzed Ocean Bottom Seismometer (OBS) data from two deployments (April-July 2011 and September-November 2014) in the western SoM. Based on a high-resolution, 3D-velocity model, and on non-linear methods (NonLinLoc), our location...
Tipo: Text Palavras-chave: Localisation; Micro-séismicité; Sismomètres de fond de mer; Sismicité induite par le gaz; Micro-seismicity; Earthquake location; Ocean bottom seismometers; Gas-related seismicity.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00497/60906/64254.pdf
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The GROSMarin experiment: three dimensional crustal structure of the North Ligurian margin from refraction tomography and preliminary analysis of microseismic measurements ArchiMer
Dessa, Jean-xavier; Simon, Soazig; Lelievre, Marjorie; Beslier, Marie-odile; Deschamps, Anne; Bethoux, Nicole; Solarino, Stefano; Sage, Francoise; Eva, Elena; Ferretti, Gabriele; Bellier, Olivier; Eva, Claudio.
The deep structure of the North Ligurian margin and its contiguous Ligurian basin as well as the seismicity recorded in these zones are neither well understood nor precisely constrained. In order to better address these questions, there is a need for offshore instrumenting, which was realised for a duration of nearly 6 months during the GROSMarin (Grand Reseau d'Observation Sous-Marin) experiment. An array of 21 ocean bottom seismometers was deployed over the most active area of the margin and was complemented on land by mobile seismological stations that densified existing permanent networks. We also realised the acquisition of deep refraction seismic shots at sea in order to get a 3D distribution of velocities along the margin through travel time...
Tipo: Text Palavras-chave: North Ligurian margin; Ocean bottom seismometers; Refraction tomography; Velocity structure; Crustal units; Microseismicity.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00214/32544/31020.pdf
Registros recuperados: 3
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