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| Lenat, J-f; Bachelery, P; Bonneville, A; Galdeano, A; Labazuy, P; Rousset, D; Vincent, P. |
| In 1984, a Seabeam bathymetric survey and the measurement of the gravity and magnetic fields of the submarine east flak of Piton de la Fournaise were carried out with R/V Jean Charcot . Piton de la Fournaise, one of the most active volcanoes in the world, is a basaltic shield volcano which occupies the southeastern thirdt of Reunion Island in the southwestern Indian Ocean. Most recent volcanic activity occurred within the youngest caldera and along two volcanic rift zones, which trend northeast and southeast and extend beyond the seashore. Three main types of volcanic or volcano-tectonic features have been identified on the Seabeam map. The results show that the history of Piton de la Fournaise is characterized by very large episodes of landsliding. |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00268/37930/36011.pdf |
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| Le Traon, Pierre-yves; Stum, J; Dorandeu, J; Gaspar, P; Vincent, P. |
| A global statistical analysis of the first 10 months of TOPEX/POSEIDON merged geophysical data records is presented. The global crossover analysis using the Cartwright and Ray (1990) (CR) tide model and Gaspar et al. (this issue) electromagnetic bias parameterization yields a sea level RMS crossover difference of 10.05 cm, 10.15 cm, and 10.15 cm for TOPEX-TOPEX, POSEIDON-POSEIDON, and TOPEX-POSEIDON crossovers, respectively, All geophysical corrections give reductions in the crossover differences, the most significant being with respect to ocean tides, solid earth tide, and inverse barometer effect. Based on TOPEX-POSEIDON crossovers and repeat-track differences, we estimate the relative bias between TOPEX and POSEIDON at about -15.5 +/- 1 cm. This value... |
| Tipo: Text |
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| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00079/18983/16627.pdf |
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