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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
The active cone of Piton de La Fournaise - a character on the left gives the scale - photo Imazpress

The active cone of Piton de La Fournaise - a character on the left gives the scale - photo Imazpress

The eruption begun on January 31, 2017 at 7:40 pm local time at Piton de La Fournaise continues.

The volcanic tremor (indicator of surface eruptive intensity) remains at a high level of intensity. No seismicity was recorded during the day under the summit of Piton de la Fournaise. No significant distortions have been observed over the last few days.
The outline of the eruptive cone has closed and most of the activity is now done in lava tubes, out of sight. Surface flows are therefore low, with estimates <1 m3 / s based on satellite data from the HOTVOLC platform (OPGC - Clermont Ferrand).
The lava flow is about three kilometers long and is located in the Great Slopes at 5 kilometers from the National Road 2 and 6 kilometers from the sea. This front remains inactive on the sixteenth day of the eruption, sign of a widening of the flow.


Sources: OVPF & local media

Evolution of the RSAM (volcanic tremor and eruption intensity indicator) between January 31st and February 14th (16h local time) on the seismic station of Château Fort, located on the southern flank of the volcano. (© OVPF / IPGP)

Evolution of the RSAM (volcanic tremor and eruption intensity indicator) between January 31st and February 14th (16h local time) on the seismic station of Château Fort, located on the southern flank of the volcano. (© OVPF / IPGP)

The eruption of Bogoslof continues, despite a non-significant activity on 14 February, not detected by seismic and infrasonic monitors; The vision of the volcano by satellite was hidden yesterday by the clouds.


The first microscopic images of the ash emitted on January 31 by the Bogoslof, harvested at Dutch Harbor east of the volcano, show a vesiculated material, sometimes vitreous, sometimes rich in crystals.


Source: AVO 

SEM image of volcanic ash from January 31, 2017 eruption of Bogoslof Volcano. This is a vesicular, glassy ash particle. The sample was collected in Dutch Harbor, ca. 60 miles to the east from the volcano by Ginny Hatfield.

SEM image of volcanic ash from January 31, 2017 eruption of Bogoslof Volcano. This is a vesicular, glassy ash particle. The sample was collected in Dutch Harbor, ca. 60 miles to the east from the volcano by Ginny Hatfield.

SEM image of volcanic ash from January 31, 2017 eruption of Bogoslof Volcano. This is a vesicular, crystal-rich ash particle. The sample was collected in Dutch Harbor, ca. 60 miles to the east from the volcano by Ginny Hatfield.

SEM image of volcanic ash from January 31, 2017 eruption of Bogoslof Volcano. This is a vesicular, crystal-rich ash particle. The sample was collected in Dutch Harbor, ca. 60 miles to the east from the volcano by Ginny Hatfield.

At Sabancaya, webcams show intermittent ash emissions, and an orange aviation code. The VAAAC Buenos Aires can not give satellite images due to cloud cover.


Source: OVI - Ingemmet & VAAC Buenos Aires
 
The Insivumeh confirms the continuation of the activity at the Pacaya, with the advance of a lava flow north-westerly. It is 20 meters wide by about 50 meters in length, depending on the supply of lava from the intracrateric cone.


Source: Insivumeh - Special issue # 15-2017.

 Pacaya  lava flow - photo Berner Villela 14.02.2017 via Clima Guatemala / Twitter

Pacaya lava flow - photo Berner Villela 14.02.2017 via Clima Guatemala / Twitter

Pacaya Vista from San Miguel Petapa 14.02.2017 - photo Noticias del Sur

Pacaya Vista from San Miguel Petapa 14.02.2017 - photo Noticias del Sur

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