October 18, 2015. EN. Turrialba, Etna, Piton de la Fournaise, Kilauea .

Home / blog georges Vitton / October 18, 2015. EN. Turrialba, Etna, Piton de la Fournaise, Kilauea .

October 18, 2015. EN. Turrialba, Etna, Piton de la Fournaise, Kilauea .

October 18, 2015. 


Turrialba, Costa Rica :


Costa Rica’s Volcanological and Seismological Observatory (OVSICORI) has reported that there were two small eruption from the Turrialba Volcano that were responsible for a small amount of ash falling nearby on Friday.
No additional eruptions followed today. The volcano has been showing increased activity levels since the 10th of October, leading scientists to believe a new period of activity may be upon us.

The eruption was of a low frequency and was followed by a few minutes of subsequent tremors in the area and then another small eruption. The ash fall did not reach as far as the Central Valley as most of it fell on top of the volcano or moved just northwest with the wind.
Some neighbors were unaware of the activity and slept through it.
There was no need for an evacuation or any changes at the airport. A previous eruption resulted in needing to rent hydroelectric sweepers to clear the tracks at the airport.


Source : Costaricantimes


Etna, Sicile :

After the last episode eruptive of the New Southeast Crater, on May 16, 2015, the activity of Etna remained at a very low level, mainly characterized by a degassing, sometimes intense, of the summit craters. In particular the Northeast Crater, which have an open conduit, where degassing  is often produced by pulses, accompanied by deep rumblings that, at various times, were audible throughout the summit area. Cracks, degassing , increased during the summer months. During the same period, he was heard explosions coming from the same crater. This activity was accompanied, from the end of July, by sporadic emissions of reddish brown ash. At the Bocca Nuova, at the end of the summer an increase in gas emissions from a deep well in the center of this crater. New Southeast Crater has seen a gradual increase in its fumaroles, and during a visit to the crater made by INGV-OE , on September 23, it was felt small explosions from the easternmost vent of the crater.


Seismic activity of Etna remained generally at a very modest level, with the exception of some small seismic sequences recorded on May 23 and June 3 in the west and in the period from October 9 to 11 on the east side  and north  -west of the volcano. The total number of seismic events in the Etna region with a magnitude greater  or equal than  M2,0 in the period from May 17 to October 16, 2015 was 16, for a maximum amplitude of M3,0.


Source : INGV

Photo : Turi Caggegi


Piton de la Fournaise , La Réunion :

On the morning of Sunday, October 18 (7:40 the fifty sixth day of crisis) the eruption which began on August 24 continues. At 7:35 on the volcano weather is good and the whole massif of the volcano except  » les grandes Pentes » is clear. The eruption site is perfectly visible from the trail leading to Piton de Bert.


The eruptive tremor recorded by the Volcano Observatory decreased abruptly at 8:02 this morning. However, it continues with sporadic puffs accompanied by seismic activity. Since aerial observations have confirmed the absence of lava inside the vent.

Source : OVPF

Photo : Fournaise info



Kilauea, Hawai:


19°25’16 » N 155°17’13 » W,
Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary:
Eruptions continue at Kilauea Volcano’s summit and in its East Rift Zone at Pu’u ‘O’o. Summit inflation continued over the past day, and the summit lava lake level rose slightly. Scattered breakouts remain active northeast of Pu’u ‘O’o, within about 7 km (4 miles) of the vent. There is no lava flow threat to nearby communities. A swarm of small earthquakes continues on the south flank.


Summit deflation over the past day was associated with the summit lava lake level slowly dropping. When this happens, collapses commonly occur within the Overlook crater. Solidified lava, attached to the Overlook crater walls, collapsed into the lake on several occasions today, triggering small dust plumes and agitation of the lake surface.


Summit Observations:
Summit inflation continued over the past day, and the lava lake level has risen slightly. This morning the lake was roughly 60 m (200 ft) below the Overlook crater rim. Summit sulfur dioxide emission rates ranged from 780 to 6000 metric tons per day during the 2-week period ending October 13.

Pu’u ‘O’o Observations:
Webcams show no significant change in eruptive activity at Pu’u ‘O’o. Tilt over the past day was affected by heavy rain. The sulfur dioxide emission rate from all East Rift Zone vents was about 300 metric tons per day when measurements were last possible on October 2, 2015. A swarm of small earthquakes continues on Kilauea’s south flank, west of Ka’ena Point, near Apua Point. These south flank earthquakes are associated with a « slow slip event » – more information on slow slip events can be found in this Volcano Watch article from 2012: http://hvo.wr.usgs.gov/volcanowatch/view.php?id=119



The eastern lobe is active again, with breakouts covering tree stands that had narrowly escaped the previous flow.

 June 27th Lava Flow Observations:
Webcam images show that the ‘June 27th’ lava flow continues to be active. Satellite imagery from this week showed scattered breakouts between 2.2 and 6.3 km (1.4 and 3.9 mi) northeast of Pu’u ‘O’o. The lava flow is not currently threatening any communities.


Source : HVO

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