Report on Piton de la Fournaise (France) — 5 January-11 January 2022
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
5 January-11 January 2022
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2022. Report on Piton de la Fournaise (France). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 5 January-11 January 2022. 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)
OVPF reported that the eruption at Piton de la Fournaise continued during 5-11 January 2022. Weather clouds often obscured views of the vent, though visual observations were made daily. Lava fountains sometimes rose above the crater rim. The level of the lava lake periodically rose and overflowed the cone, sending lava flows down the flanks during 6 and 8-9 January. The lava effusion rate was an estimated 2-20 meters per second based on satellite data. Several breakouts of lava from the tube were noted. On 9 January a new lava flow slowly advanced along the S margin of the flow field, reaching 1,800 m elevation. On 10 January hikers observed smoke from an area in the S part of the caldera, likely from vegetation that had been set on fire from lava flows. The flow field continued to widen but had not significantly lengthened.
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.