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Earth of fire

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

Publié par Bernard Duyck
Publié dans : #Actualités volcaniques
 Vapor emissions above the eruptive site of Hunga Ha'apai - 17.01.2015 - photo Matangi Tonga on line

Vapor emissions above the eruptive site of Hunga Ha'apai - 17.01.2015 - photo Matangi Tonga on line

A visit at the eruptive Hunga Ha'apai site was made this weekend by the GNS volcanologists, accompanied by journalists of Matangi Tonga on line.


They report the same style of eruption than the 2009, but with a higher volume of erupted materials.High emissions of vapor, forming a high plume high of 7-10 km, is often issued with ejection periods of high humidity and dense ash, and small blocks at 200-300 meters. Ash emissions decrease from last week, with a rate of 2-3 per hour. Dangerous side surges still occasionally extend over one kilometer from the vent. We do not notice traces of pumice rafts or other floating debris.

Frigates advantage of thermals and animate this beautiful picture.

Tonga Met Service recommends a prohibited area security of 10 km around the site, due to the sulfur content of the gas cloud emitted by the eruption. Sulfur gases are observed in 15-25 nautical miles, while they are not in the immediate vicinity.
 

Hunga Ha'apai - Frigates birds advantage of thermal generated by the eruption - photo Matangi Tonga on line

Hunga Ha'apai - Frigates birds advantage of thermal generated by the eruption - photo Matangi Tonga on line

After an increase of seismicity, the Soputan / North Sulawesi erupted on 18/01/2015 at 11:30, emitting a plume of ash and gas estimated at 5,500 meters, together with a block avalanche.

Nocturnal incandescent plume an estimated 700 m. and falls sur1.500 m west side blocks are identified in the late evening.

 

Soputan: the eruptive plume 18.01.2015 / 11:38 - photo PVMBG

Soputan: the eruptive plume 18.01.2015 / 11:38 - photo PVMBG

 Soputan: activity on 18.01.2015 / 11:10 p.m. loc. - Photo Chematierra / Volcanoalert / Twitter

Soputan: activity on 18.01.2015 / 11:10 p.m. loc. - Photo Chematierra / Volcanoalert / Twitter

Some pictures of the lava spine that has formed at the top of Sinabung, before it collapses ... these courses are unstable by nature.

The lava spine of Sinabung - a click to enlarge - 01/18/2015 Photo via Twitter / Adam LeopoldThe lava spine of Sinabung - a click to enlarge - 01/18/2015 Photo via Twitter / Adam Leopold

The lava spine of Sinabung - a click to enlarge - 01/18/2015 Photo via Twitter / Adam Leopold

The Icelandic lava field Holuhraun / Nornahraun reached nearly 85 km² today. Seismic activity remains constant Bárðarbunga, w ith 60 shakes the 18.01, and 15 for the dyke.

Note : the name of the lava field could still change ... according to Icelandic law, it is the local authority of the place of eruption that ala load, in this case it is the authority Myvatn: the volcanologist Þorvaldur Þórðarson suggested Nornahraun, because there was spotted Pelé's hair (nornahár in Icelandic), name adopted by the Met Office on the maps ... Ármann Höskuldsson, another volcanologist, described the eruption as the fire breathing of a dragon (dreki in Icelandic), due to the proximity of Drekagil, the canyon of the dragon, and proposed Drekahraun or Drekaborgir. (Iceland Review)

 

  Holuhraun - lava field - photo Páll Stefánsson / Iceland Review.

Holuhraun - lava field - photo Páll Stefánsson / Iceland Review.

Holuhraun lava field - the active areas are made more visible by image adjustments - doc IES / NASA EO-1

Holuhraun lava field - the active areas are made more visible by image adjustments - doc IES / NASA EO-1

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