By Patrick Bachelery, Jean-François Lenat, Andrea Di Muro, Laurent Michon
Piton de l. a. Fournaise and Karthala are either protect 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 heritage of medical learn and tracking, with many facts accumulated in the course of contemporary eruptions. it really is one of the main studied volcanoes on the planet. The paintings provided during this monograph contains geological, geophysical, geochemical and petrological features, but additionally experiences on actual geography, ordinary risks and the sociological and behavioural approaches.'
The Karthala volcano might be much less popular, however it serves as an engaging comparability to Piton de l. a. Fournaise. even if located on the subject of the volcanoes of Hawaii, it differs from them through its extra alkaline magmas and not more common task. It was once additionally monitored for greater than 25 years, generating notable eruptions in contemporary years.
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Additional info for Active Volcanoes of the Southwest Indian Ocean: Piton de la Fournaise and Karthala
F. Lénat Fig. 12 The summit in 1911 by Lacroix (1936, 1938). Top sketch map. Bottom picture taken from point a on the map) 1 A Brief History of the Observation of the Central Area … 19 Fig. 13 Oblique air photo from 1936 showing the collapsed summit. This is one from the ﬁrst set of aerial pictures of Piton de la Fournaise. It was taken by Jean Arnoux from an airplane piloted by Squadron Leader Wachenheim in September 1936 (in Lacroix 1936) Bellecombe. However, before the road was built, Marcel Ducrot organized a periodic surveillance which included a visit to the volcano every 2–3 months.
4a) shows high resistivity layers (about 1400 m thick). This pattern is well explained by the geological nature of this area, mostly composed of water unsaturated, young (Salvany et al. 2012) lava flows, scoriaceous formations and a dense network of dykes and sills. The magnetic anomaly map of Piton des Neiges (Fig. 2b) broadly reflects the age distribution of surface rocks (Salvany et al. 2012). -F. 780 Ma) are mapped. However, in detail, the magnetic map appears to provide a smoother or more integrated image of the pre- and post-Brunhes-Matuyama reversal formations.
The ﬁrst one is interpreted as an old rift zone of Piton des Neiges and the second as the flank of Les Alizés. 1 La Réunion Edifice La Réunion ediﬁce is almost centrally located between the transform faults that bound the oceanic compartment on which it lies (Lénat 2016, this volume Chap. 2). The island is elliptical in shape (50 × 70 km) with a NW–SE orientation, and rises to 3070 m above sea level. It is composed of two volcanoes, Piton des Neiges, occupying the NW two thirds of the island, and Piton de la Fournaise.