The eruption that began on 11 September at 8:41 (local time) at Piton de la Fournaise is continuing. Despite some fluctuations, the volcanic tremor (indicator of eruptive intensity surface) is relatively stable since September 14. Remember that changing this setting, down as well as up, can change quickly depending on the depth supply variations.
Evolution of the RSAM (indicator of volcanic tremor and the intensity of the eruption) from 7.00 (3h UTC) on September 11 to 15:30 (11:30 UTC) on September 16 for the seismic station Faujas, located on the north side of the volcano . (© OVPF / IPGP)
No significant deformation or seismicity were recorded during the day.
The volume of lava emitted from the beginning of the eruption is estimated (by satellite remote sensing) between 2 and 5 million m³.
Field observations: The main cone continues to build around a lava fountain fifty meters high (around 15:30). A second cone with smaller dimensions is fused upstream of the latter. Only a slight degassing remains observable at this second cone. The main cone is breached on its northern side, and a lava flow escapes towards the northeast. The front of this flow, falling under the cloud layer, could not be located.
Piton de la Fournaise - the undermining of the cone with the rise of a large block that will be swept away by the flood - a click on the photo to enlarge - © Thierry Sluys / All rights reserved - 15/09/2016
Addenda to article of 15.09 with pictures of Thierry Sluys:
"a huge block that came obstruct the exit of the breached cone will split and go, such a large ship, on the lava flow." - See Article
In Bulusan / Philippines, a phreatic eruption take place on September 16 at 4:54 p.m. local. It lasted about 4 minutes and produced a plume of gray ash amount to 1,500 meters, before drifting towards the northeast.
The alert remains at level 1, together with a permanent danger zone, prohibited, of 4 km radius around the crater. Civil aviation authorities should warn pilots to avoid flying near the top of the volcano, the phreatic eruptions being sudden. The inhabitants of the drainage areas must remain vigilant: mudslides and lahars can occur due to heavy and prolonged rains.