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Registros recuperados: 5
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Crustal and uppermost mantle structure variation beneath La Réunion hotspot track 5
Fontaine, Fabrice R.; Barruol, Guilhem; Tkalcic, Hrvoje; Woelbern, Ingo; Ruempker, Georg; Bodin, Thomas; Haugmard, Meric.
The Piton de la Fournaise basaltic volcano, on La Réunion Island in the western Indian Ocean, is one of the most active volcanoes in the world. This volcano is classically considered as the surface expression of an upwelling mantle plume and its activity is continuously monitored, providing detailed information on its superficial dynamics and on the edifice structure. Deeper crustal and upper mantle structure under La Réunion Island is surprisingly poorly constrained, motivating this study. We used receiver function techniques to determine a shear wave velocity profile through the crust and uppermost mantle beneath La Réunion, but also at other seismic stations located on the hotspot track, to investigate the plume and lithosphere interaction and its...
Tipo: Text Palavras-chave: Surface waves and free oscillations; Oceanic hotspots and intraplate volcanism; Hotspots; Crustal structure; Indian Ocean.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00287/39830/38352.pdf
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Monitoring austral and cyclonic swells in the “Iles Eparses” (Mozambique channel) from microseismic noise 5
Barruol, Guilhem; Davy, Celine; Fontaine, Fabrice R.; Schlindwein, V.; Sigloch, K..
We deployed five broadband three-components seismic stations in the Iles Eparses in the south-west Indian Ocean and on Mayotte Island, between April 2011 and January 2014. These small and remote oceanic islands suffer the effects of strong ocean swells that affect their coastal environments but most islands are not instrumented by wave gauges to characterize the swells. However, wave action on the coast causes high levels of ground vibrations in the solid earth, so-called microseismic noise. We use this link between the solid earth and ocean wave activity to quantify the swells locally. Spectral analyses of the continuous seismic data show clear peaks in the 0.05–0.10 Hz frequency band (periods between 10 and 20 s), corresponding to the ocean wave periods...
Tipo: Text Palavras-chave: Microseismic noise; Swell; Tropical storm; Cyclone; Iles eparses; Mozambique channel.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00312/42291/41618.pdf
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The 2007 eruptions and caldera collapse of the Piton de la Fournaise volcano ( La Reunion Island) from tilt analysis at a single very broadband seismic station 5
Fontaine, Fabrice R.; Roult, Genevieve; Michon, Laurent; Barruol, Guilhem; Di Muro, Andrea.
Seismic records from La Réunion Island very broadband Geoscope station are investigated to constrain the link between the 2007 eruptive sequence and the related caldera collapse of the Piton de la Fournaise volcano. Tilt estimated from seismic records reveals that the three 2007 eruptions belong to a single inflation-deflation cycle. Tilt trend indicates that the small-volume summit eruption of 18 February occurred during a phase of continuous inflation that started in January 2007. Inflation decelerated 24 days before a second short-lived, small-volume eruption on 30 March, almost simultaneous with a sudden, large-scale deflation of the volcano. Deflation rate, which had stabilized at relatively low level, increased anew on 1 April while no magma was...
Tipo: Text Palavras-chave: Piton de la Fournaise; Caldera collapse; Broadband seismometer; Tilt; Tidal correction; Deep magma injection.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00287/39823/38326.pdf
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Tide-induced microseismicity in the Mertz glacier grounding area, East Antarctica 5
Barruol, Guilhem; Cordier, Emmanuel; Bascou, Jerome; Fontaine, Fabrice R.; Legresy, Benoit; Lescarmontier, Lydie.
The deployment of a seismic network along the Adelie and George V coasts in East Antarctica during the period 2009-2012 provides the opportunity to monitor cryoseismic activity and to obtain new insights on the relationship between tidal cycles and coastal glacier dynamics. Here we focus on records from a seismometer located on a rocky outcrop in the vicinity of the grounding line of the 35 km broad Mertz glacier, a major outflow of this region. We detect numerous icequakes (50,000 events within 10 months and up to 100 events/h) and demonstrate their clear tidal modulation. We suggest that they result from ice friction and fracturing around the rocky peak and from the glacier flexure in response to the falling and rising tides at its grounding area. We...
Tipo: Text Palavras-chave: Icequakes; Mertz glacier; Tide; Antarctica; Cryoseismology; Adélie land.
Ano: 2013 URL: https://archimer.ifremer.fr/doc/00244/35567/34098.pdf
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Tracking major storms from microseismic and hydroacoustic observations on the seafloor 5
Davy, Celine; Barruol, Guilhem; Fontaine, Fabrice R.; Sigloch, Karin; Stutzmann, Eleonore.
Ocean wave activity excites seismic waves that propagate through the solid earth, known as microseismic noise. Here we use a network of 57 ocean bottom seismometers (OBS) deployed around La Réunion Island in the southwest Indian Ocean to investigate the noise generated in the secondary microseismic band as a tropical cyclone moved over the network. Spectral and polarization analyses show that microseisms strongly increase in the 0.1–0.35 Hz frequency band as the cyclone approaches and that this noise is composed of both compressional and surface waves, confirming theoretical predictions. We infer the location of maximum noise amplitude in space and time and show that it roughly coincides with the location of maximum ocean wave interactions. Although this...
Tipo: Text Palavras-chave: Microseismic noise; Ocean bottom seismometers (OBS); Major storms; Indian Ocean; Hydroacoustic; Rayleigh waves.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00287/39824/38331.pdf
Registros recuperados: 5
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