OVPF reported that a seismic crisis at Piton de la Fournaise began at 0700 on 11 August and was accompanied by rapid deformation.
The locations of the earthquakes and area of deformation indicated that magma rose from deep under the SE edge of Dolomieu Crater to beneath the E and SE flanks.
Tremor began around 1620, indicating the likely start of this year?s fourth eruption, though inclement weather conditions prevented visual confirmation.
The Alert Level was raised to 2-2.
On 12 August OVPF confirmed that fissures had opened in the E part of l?Enclos Fouqué, SE of the upper Grandes Pentes.
Scientists saw two fissures, about 1.4 km apart, at 1,700 and 1,500 m elevation during an overflight on 13 August.
Only the lowest elevation fissure was active.
Three distinct cones along the fissure fed lava flows that merged into one which traveled to 665 m elevation and caused small fires as it burned local vegetation.
Source: Observatoire Volcanologique du Piton de la Fournaise (OVPF)