The results of this first day of eruption of 2016 is:
This eruption was set up after 8:25 from a very important seismicity associated with the deformations linked to a pressurization in the south east of the Château Fort crater.
To be specific, we observe since May 16, 2016 an increasing trend of indicators followed by OVPF (Flux of gases deformation and seismicity). Slowly enough signals (first gas, then deformation and seismicity finally) showed a significant increase on 10 days with for example a maximum of 10 earthquakes in 24 hours.
The sharpest increase in pre-eruptive activity has made only on 25 May from 11:40 p.m..
The day of 26 May was marked by the arrival of the tremor at 8:05 , and also by very poor weather conditions greatly limiting the observations.
On the ground, a first recognition from 9:00 helped affirm the occurrence of a first eruption by listening and by visual observation of the eruption from the GR from the parking Piton de Bert. Then an aerial survey with the help of the Air Section of the Police and the Peloton de Gendarmerie de Haute Montagne provided a glimpse of several fountains and record a GPS position of the highest point of the fissure (Figure 1).
The bad weather window forced SAG to spend only a few minutes to the vertical of the site, between the clouds. For other aircraft was luckier, some additional elements have been made by the media. A cinder cone (fallen from 6 fountains) is being built on a flat area around 1850 m above sea level about 1km-1.5km in the south east of the Château Fort crater.
At OVPF the records of seismic intensity (RSAM) showed up to about 18H a significant decrease (by a factor 3). Subsequently the intensity has re-grown and is now relatively stable (over the last three hours – see Figure 2).
If time permits, recognition will be made on May 27
Communication from the Prefecture:
Volcanic activity at Piton de la Fournaise: Passage in backup stage
After the eruptive crisis Thursday, May 26, 2016 that led the passage to the level of alert 2-2 device specific ORSEC * Volcano, the Volcano Observatory of Piton de la Fournaise not record any activity tremor type or degassing since this morning 11:40.
In these circumstances, the prefect of Reunion decided the passage to the level of alert: specific device ORSEC * volcano, from 24:40 this Friday, May 27, 2016.
Despite the termination of activity of the geo-physical point of view and the cessation of feeding (end of tremor, vibration associated with the path of the magma and gases it contains)an eruption remains likely in the days and hours to come up.
Consequently, the prohibition of access to the top of the Enclos and put a helicopter in the area of the volcano remain in effect until further notice.
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May 28 , 2016. Piton de la Fournaise , La Réunion :
Sources : OVPF , Fournaise info.
Photos : Imazpress reunion
Video : Imazpress reunion