By Patrick Bachelery, Jean-François Lenat, Andrea Di Muro, Laurent Michon
Piton de l. a. Fournaise and Karthala are either guard volcanoes within the southwest Indian Ocean. This e-book summarizes the paintings performed on those very energetic basaltic volcanoes. Piton de l. a. Fournaise has an extended historical past of medical examine and tracking, with many info gathered in the course of contemporary eruptions. it really is one in every of the main studied volcanoes on the planet. The paintings awarded during this monograph comprises geological, geophysical, geochemical and petrological features, but in addition experiences on actual geography, traditional dangers and the sociological and behavioural approaches.'
The Karthala volcano will be much less popular, however it serves as an attractive comparability to Piton de l. a. Fournaise. even if located just about the volcanoes of Hawaii, it differs from them via its extra alkaline magmas and no more widespread task. It was once additionally monitored for greater than 25 years, generating amazing eruptions in fresh years.
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Extra resources for Active Volcanoes of the Southwest Indian Ocean: Piton de la Fournaise and Karthala
Minshull and Charvis 2001; Watts 1994; Watts and ten Brink 1989) and suggests a dynamic equilibrium where positive buoyancy of the plume would contribute to the dynamic support of the load of La Réunion. This had been suggested by Bonneville et al. (1997) and Lénat et al. (2009b). The gravity data support this absence of flexure (Lénat 2016, Chap. 2). On the base of this geometry of the ocean floor, de Voogd et al. (1999) estimate the subaerial part of La Réunion as being only 3 % by volume of the whole volcanic system.
2), but extend farther offshore (about 38 km) and cover a wider area (about 36 km near the seashore). Both positive and negative anomalies are observed, although the latter cover a larger surface. The presence of negative and positive anomalies indicates that the ES construction spans successive paleomagnetic epochs. 78 Ma). 3 Ma). Most of this large structure is buried by subsequent mass wasting and sedimentary products. Using the same approach, Gailler and Lénat (2010) establish that the magnetic anomalies on the eastern submarine flank are caused by the presence of large, now buried volcanic constructions spanning at least the Brunhes and Matuyama paleomagnetic epochs.
Finally, to the north, near the Mahanoro-Wilshaw fracture zone, a large ridge could be related to the transform fault system. At its southern tip there is a substantial seamount with a clear 120°N elongation. A different type of individual seamount is observed to the north-east of the island (Oehler et al. 2008) (Fig. 3). These seem to have a pristine morphology and are well-shaped flat-topped seamounts. Oehler et al. describe two of them that appear to have grown on the lower submarine flank of La Réunion and must therefore be young constructions.
Active Volcanoes of the Southwest Indian Ocean: Piton de la Fournaise and Karthala by Patrick Bachelery, Jean-François Lenat, Andrea Di Muro, Laurent Michon