Piton de la Fournaise , La Réunion : strong and progressive increase in the tremor.

Piton de la Fournaise , La Réunion :  strong and progressive increase in the tremor.

Activity Bulletin Thursday, October 22, 2015 at 17:30 (Local Time)

During the day the OVPF recorded a slight upward trend of the tremor present since the end of the effusive eruption phase (see bulletin of 19 October).

Moreover, an independent observer reported observing projections of lava associated with small explosions inside the vent. These projections seem related to the percolation of gas through a layer of further liquid lava located in sub-surface.

All these observations confirm that although the effusive activity of Piton de la Fournaise is currently stopped, the eruption does not mean complete.

Seismic activity:
Since this morning around 8:00 am on October 22, 2015, we have witnessed a gradual increase in the intensity of the tremor which, for the record, has continuously been present since the end of the effusive phase of Sunday 19 to 8:02.
Since 12:00 , the level of the recorded tremor has doubled. But it is still 40 times less intense than during the eruption.

Deformations:
No significant deformation was recorded.
Volcanic gas flow:
An isolated burst of SO2 was recorded at 10:00 this morning.

Second phase of the effusive eruption in progress.

From 19:30 on October 22, the Volcanological Observatory recorded a strong and progressive increase in the tremor, witnessed a resumption of the transfer of magmatic fluids to the surface. To 10:45 p.m., the volcano observatory was confirmed by the image of the Piton de Bert camera the resumption of surface lava flows.
On the morning of October 23 at 6:30 am the weather on the top of the Piton de la Fournaise is mixed (alternating passages sunny and fog) making the observation of the eruption uncertain . As before the activity is concentrated near the crater Rivals.

To recall, in eruptive phase and no major change in the activity or in the recorded signals, the transmission frequency of detailed bulletins from the observatory is one by week.

October 23, 2015. Piton de la Fournaise , La Réunion :

Source : OVPF

Photo : Mamz’l Ha

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