Report on Piton de la Fournaise (France) — 4 April-10 April 2001
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
4 April-10 April 2001
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2001. Report on Piton de la Fournaise (France). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 4 April-10 April 2001. Smithsonian Institution and US Geological Survey.
Piton de la Fournaise
21.244°S, 55.708°E; summit elev. 2632 m
All times are local (unless otherwise noted)
The OVPDLF reported that the eruption that began at 1329 on 27 March ended on 4 April. During the eruption a ~ 2-km-long system of ESE-trending en-echelon fissures formed in an area 50 m below the S rim of the Dolomieu summit crater. The upper fissure was active for a few hours. The main eruption was focused on the ESE flank of the volcano, only 200 m N of the preceding October 2000 eruption. Aa flows approximately 5.5 and 2 km long traveled down the SE flank of the volcano. After one week of activity the eruption stopped following about 100 gas piston events at 0700 on 4 April.
Geological Summary. Piton de la Fournaise is a massive basaltic shield volcano on the French island of Réunion in the western Indian Ocean. Much of its more than 530,000-year history overlapped with eruptions of the deeply dissected Piton des Neiges shield volcano to the NW. Three scarps formed at about 250,000, 65,000, and less than 5,000 years ago by progressive eastward slumping, leaving caldera-sized embayments open to the E and SE. Numerous pyroclastic cones are present on the floor of the scarps and their outer flanks. Most recorded eruptions have originated from the summit and flanks of Dolomieu, a 400-m-high lava shield that has grown within the youngest scarp, which is about 9 km wide and about 13 km from the western wall to the ocean on the E side. More than 150 eruptions, most of which have produced fluid basaltic lava flows, have occurred since the 17th century. Only six eruptions, in 1708, 1774, 1776, 1800, 1977, and 1986, have originated from fissures outside the scarps.