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Earth of fire

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

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques

The volcanic news are a little shaken at the moment with many eruptions and alerts. Among them, a brief overview, not exhaustive!

In Sicily, Etna resumed activity at the northeast crater with a small ash emission that on July 17 ... more to come ! 

 

Etna - small ash emission from northeast crater - photo Turi Caggegi / iEtna

Etna - small ash emission from northeast crater - photo Turi Caggegi / iEtna

The Raung, always active on the island of Java, no more disturbing the Airport of Denpasar / Bali ... the winds turned and the plume is moving from the 16 to the northwest, justifying the closure of airports in Surabaya and four other smaller, which Notohadinegoro, Blimbingsari and Abdurahman Saleh Airport on Malang.

According to the Jakarta Globe, Surabaya airport would open again on Friday.

The plume of Gunung Raung on 07/17/2015 - Photo Reuters

The plume of Gunung Raung on 07/17/2015 - Photo Reuters

New direction for the plume of Raung, to the NW - left, the 16.07 / Satel. Citra - right, the 17.07 / sat.Aqua via NASA Modis EODIS overview - one click to enlarge.New direction for the plume of Raung, to the NW - left, the 16.07 / Satel. Citra - right, the 17.07 / sat.Aqua via NASA Modis EODIS overview - one click to enlarge.

New direction for the plume of Raung, to the NW - left, the 16.07 / Satel. Citra - right, the 17.07 / sat.Aqua via NASA Modis EODIS overview - one click to enlarge.

In Sinabung, new pyroclastic mark the southeast flank the 17 and 18 July.
 

Sinabung - development of the pyroclastic flow of 17.07.2015 / 3:22 p.m. - photo endrolew@
Sinabung - development of the pyroclastic flow of 17.07.2015 / 3:22 p.m. - photo endrolew@

Sinabung - development of the pyroclastic flow of 17.07.2015 / 3:22 p.m. - photo endrolew@

In Mexico, Popocatepetl issued an ash plume loaded this July 17 at 7:14.

Note that the decreasing of the activity of Colima has reduced the prohibited area from 12 to 8 km away, and allow the return of some families in their homes

Source: Mexico Webcams

Popocatepetl - 07.17.2015 / 7:14 - photo webcamsdeMexico

Popocatepetl - 07.17.2015 / 7:14 - photo webcamsdeMexico

The Phivolcs reports a small ash eruption from Bulusan, registered as an eartquake explosive type  (??) for 11 minutes, July 17 1:10 p.m. to 1:21 p.m.. She was accompanied by a plume of gray ash amount only 200 meters high, before drifting towards the WNW. The volcano alert level remains at 1 / abnormal.

Source: Phivolcs.

Sabancaya and significant lava flows seen from the ISS 024-E-008396 on 15.07.2010. -doc. Nasa

Sabancaya and significant lava flows seen from the ISS 024-E-008396 on 15.07.2010. -doc. Nasa

Experts from the Volcanological Observatory INGEMMET / Peru climbed Sabancaya volcano, 5,960 meters high, on 9 and 10 July, to take and analyze the ash emitted by the volcano in recent weeks.

The ash is gray color and grains measuring less than 0.5 mm., revealing to observation the presence of plagioclase, biotite and amphibole (original silicate magmatic)

Plagioclase crystals measuring less than half a millimeter, and are some tabular form.
The crystals of biotite, less than 0.2 mm, are slightly altered.
Amphibole are encompassed in a fresh or juvenile lithic matrix; lithic material is of two different types: fresh or juvenile, dark gray and consisting of fragments of up to 0.3 mm, or oxidized, rusty, with fragments of up to 0.2 mm.
Are also observed fragments of glassy translucent, amorphous, less than 0.1 mm.

The presence in the ash of predominant juvenile fragments suggests that Sabancaya entered an new eruptive phase of magmatic origin, and may increase in intensity in the weeks or months.

Source : OVI / INGEMMET - VOLCÁN SABANCAYA ENTRÓ EN FASE ERUPTIVA – 16.07.2015 – link
 

The ashes of Sabancaya - photo INGEMMET 16/07/2015

The ashes of Sabancaya - photo INGEMMET 16/07/2015

Sabancaya, whose name means "tongue of fire" in Quechua and Ampato - photo Antony Van Eeten

Sabancaya, whose name means "tongue of fire" in Quechua and Ampato - photo Antony Van Eeten

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