Activity Bulletin Wednesday, June 8, 2016
Since the end of the eruption OVPF recorded a total of :
22 volcano-tectonic earthquakes summital (including 1 June 1st, 3 June 6th 3 June 7th);
3 deep earthquakes beneath the Fournaise (between -10 and -15 km);
11 local earthquakes (Under the Island);
6 teleseismic (world, experienced by devices on the island);
200 collapses (in the crater Dolomieu and on the flows of August 2015).
Inflation continues at a still higher rate (more than 2 cm distance measured at the base of the terminal cone from the end of the eruption) which is equivalent to the rates prior to the eruption of August 2015.
A source of pressure was modeled ~ 1.5km below the summit.
Geochemistry of gas
Using its network of sensors the OVPF recorded:
at the top – Multigas station: no remarkable variation, the sulfur species remain generally low concentration, increases are punctual,
from the edge of the Enclos – NOVAC station network: the flow of SO2 below the detection threshold,
in the plain des Sables – measures CO2_sol by mobile device: latest measures this morning at Gite show a further increase,
from the Plains – CO2_sol stations: from 1 to 3 June was a significant increase in the Plaine des Palmistes
Alert level: Vigilance
Synthesis and Conclusion:
Seismicity is low
The deformation is important
The CO2 flux of soil are important
For the record, the last three eruptions (in July 2015, August 2015 and May 2016) the return of seismicity made themselves very late (maximum 2 weeks) as compared to other indicators.
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June 09 , 2016.Piton de la Fournaise , La Réunion :
Source : OVPF
Photos : Ipr