18/05/2015. Etna, Piton de la Fournaise, Hakoneyama .
Etna, Sicile :
The eruptive episode of the New Southeast Crater (NCSE) of Etna, which began on the night between 11 and 12 May 2015, was completed in the 16th May 2015. The explosive activity of mouths at the top the NCSE had begun to show a marked decrease in the afternoon the day before, and effusive activity gradually depleted during the 16 May .The cessation of explosive activity has been accompanied by a significant reduction in the amplitude of the volcanic tremor; after the end of the effusive activity, the source of volcanic tremor has deepened and stabilized in a position below the center of the summit area. Explosive activity of this episode was characterized by frequent Strombolian explosions, which were regularly accompanied by the emission of volcanic ash. The ash cloud rose from a few hundred meters above the summit of Etna before being dispersed by the wind. In the regions of the south, southeast, east and northeast, were observed slight ash fall.
After the opening of the eruptive fissure on the northeast flank of the cone NCSE the afternoon of May 13, all the effusive activity took place from vents aligned along this fracture, feeding a single flow of lava which was spilled to the north – east to Mount Rittmann, then east towards Monte Simone. Having surrounded the Monte Simone, the flow spread southward into two main branches. One of them approached the base of the north wall of the Valle del Bove, stopping north of Rocca Musarra, while the other, wider, has expanded to the west of the Rocca Musarra up to a distance of a little more than 5 km from the NCSE, and an altitude of about 1700 m.
In the late morning of 15 May, we also observed emissions of ash from the Bocca Nuova. From thermal camera recordings of the INGV-Osservatorio Etneo it is clear that this material was cold, and ash fallout on the northeast after these events consisted of old weathered material.
Source : INGV
Photo : Turi Caggegi
Piton de la Fournaise, La Réunion :
Monday, May 18th 7am
UPDATE … visible flows of lava path
The eruption is still active this morning. The lavas have addressed this morning the “Grandes Pentes” and are now visible from the lava path.
The second eruption of 2015, which began on Sunday mid-day, after more than four years of rest of the Piton de la Fournaise, has the same premise as that which began March 8, 1998.
Since the eruption of the month of February, the show is visible from the path along the fence toward the “Piton de Bert “peak. It takes three hours walking round trip from the parking around Foc-Foc after the “Plaine des Sables” . And the promise to see the two flows surrounding the Château-Fort crater has attracted many people yesterday. At which point the car park Foc-Foc enjoyed a beautiful mess.
This morning, the lava continues to go down. They comes to approach the “Grandes Pentes.” This fantastic slide – almost 40% incline – overlooking the coast to his full height, we are here to 1700 meters altitude. Result, the lavas are visible from the lava path where many people have made the trip to enjoy the show.
Will they reach the National Road 2? Although lava fountains appear very active and the flows well powered , Nicolas Villeneuve, director of the Volcano Observatory of Piton de la Fournaise (OVPF) recalls that there is no example in recent decades of flow reaching the road from the present eruption zone. Assuming that the eruption also remains active in the coming days and that flows descend the Grandes Pentes, the high ledge of the Grand Brûlé may represent for them a long journey through the desert.
Source : Fournaise Info
Photo : Dan BQN, Kelly Maillot
Hakoneyama , Japon :
The Mt. Hakone continues to inflate: The ground is still rose 4 cm in 5 days in the north of the crater
On 5/16/2015, Geospatial Information Authority of Japan announced they observed the land uplift up to 12cm in the north of the crater.
They analyzed the data collected by observation satellite “Daichi 2? on 5/15/2015 and reported the land uplift is seen in 200m diameter area of the restricted zone.
They observed the land uplifted by 6cm on 5/7/2015, and by 8cm on 5/10/2015, which suggests the mountain keeps expanding.
It all started last March with some seismic swarms, but a rapid increase in seismic activity in the region in mid-April, also allowed recorded more superficial events of 5 and 2 kilometers deep under the volcano, indicating a net magma ascent. Thus, 26 April 2015 all residents have been notified and the alert level was increased to 1. The vertical deformation reached 12 cm between April 17 and May 15 in an area of about 200 m in diameter, with a significant swelling in the northern part of the caldera very near the tourist center, the hydrothermal Vents Owakudani, showing signs of increased activity in recent days, with higher emissions of steam and vapor emission in places where normally there are not any.
All this has led the Japanese authorities raised the alert level to 2 and warn against the possibility of an imminent eruption steam or a phreatic eruption in the region. It was also decided to close access to the area (despite strong demand from the tourist center), given what happened on the Ontake volcano there are some months when a phreatic eruption had surprised all visitors.
Source : Fukushima-diary.com , Avcan.
Photo : ?64