First eruption 2017 of Piton de La Fournaise:
After signs of agitation at the end of January, a seismic crisis was triggered on the 31st from 15:22, justifying the passage on alert 1 / probable or imminent eruption.
The volcanic tremor, and the arrival on the surface of the magma, is recorded since 19:40. The Orsec-volcano plan goes on alert 2-2 / eruption in progress. Access to the Enclos Fouqué and the installation of a helicopter in the area of the volcano are prohibited.
The first images of the webcam of Piton de Bert suggest two active vents and the glow of a lava flow.
Piton de La Fournaise - first pictures 31.01.2017 at 17h09 and 17h19 - a click to enlarge - webcam Piton de Bert
In the morning, the images show an active zone downstream on the crack, characterized by several 20-30 meter lava fountains, located at 1,100 meters at the SSE of Château-Fort.
The height of the eruptive vent is estimated at about ten meters. It lets escape a flow a'a which separates in several arms; At 7:40 local, the lava flow covered a distance of 600 to 750 m. with respect to the vent.
Cracks open at the beginning of the eruption are no longer active, but remain marked by fumaroles.
Sources: OVPF - Fournaise info - Thierry Sluys
Piton de La Fournaise - Localization of the vent, and localization of the lava front on 01/02/2017 (07:40 local time, "Front Bras 1, Arm 2") Two other eruptive cracks occur are open at the beginning of the eruption more upstream (on both sides of the point "Mi-Fiss1 and 2") and are not currently active (© OVPF / IPGP)
An underwater volcanic eruption in the Tonga archipelago has just been discovered by scanning satellite images.
For the past two years, geomorphologist Dr. Murray Ford of the University of Auckland has been using satellite imagery to track the evolution of an island of ash and fragments of rock, created by an eruption in December 2014 / January 2015.
During an image digitization on January 31, 2017, he observed a large plume of 30 km by 20, not far from the formed island and only 33 km from Tongatapu, the main island of Tonga. The image was taken by the USGS / Nasa Landsat 8 open source satellite on 27 January.
The plume appears to originate from a place that was the site of eruptions in 1911, 1923, 1970, and 12.1998 / 01.1999. According to Brad Scott / GNS, the NASA EOS-Aura satellite would not have detected any volcanic gas signature in the atmosphere ... but underwater volcanic eruptions are often detected a moment after the event, and can neither connect it nor exclude a connection with the pumice seen at 420 km in mid-November.
Source: NZ Herald - 31.01.2017 / 16h42