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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
Turrialba - emission of ash 02.08.2018 / 9h05 - RSN webcam

Turrialba - emission of ash 02.08.2018 / 9h05 - RSN webcam

The Turrialba volcano has an intermittent eruptive activity characterized by passive ash emissions (of varying concentration) and eruptive column heights between 100 and 300 m since 23 July.

Since 19 hours, August 1, the activity has been more sustained and accompanied by a persistent tremor of greater magnitude. The eruptive column reached a little higher, up to about 500 m, and dispersed towards the west-southwest, affecting the areas of Coronado, Carthago, areas south of the volcano Irazú, and Heredia, among others.

At 0223 on 2 August, an eruption was accompanied by a plume of ash rising to 1,000 meters above the crater (4,340 m asl.)

Poas - 02.08.2018 - Vulcanology experts from the RSN (UCR-ICE), OVSICORI and the National Emergency Commission (CNE) inspected today the state of progress of protection shelters  against falls of bombs and volcanic blocks. - RSN photo

Poas - 02.08.2018 - Vulcanology experts from the RSN (UCR-ICE), OVSICORI and the National Emergency Commission (CNE) inspected today the state of progress of protection shelters against falls of bombs and volcanic blocks. - RSN photo

After the phreatic activity of Poas and the damage caused to the observation deck in April 2017, modifications had to be made to repair and ensure better safety of the place.

Protective shelters against the fall of bombs and blocks are currently under construction, before reopening of the crater observation platform.

Source: RSN & Ovsicori
 

Ambae - on the general view, there are Ambae and ash emissions of Lombenben, and to the east, the island of Pentecost - a click to enlarge - images Sentinel 2 Bands 11,8,2 of 02.08.2018
Ambae - on the general view, there are Ambae and ash emissions of Lombenben, and to the east, the island of Pentecost - a click to enlarge - images Sentinel 2 Bands 11,8,2 of 02.08.2018

Ambae - on the general view, there are Ambae and ash emissions of Lombenben, and to the east, the island of Pentecost - a click to enlarge - images Sentinel 2 Bands 11,8,2 of 02.08.2018

Ambae - homes collapsed under the weight of ashes - photo AnglicanOverseasAid 02.08.2018

Ambae - homes collapsed under the weight of ashes - photo AnglicanOverseasAid 02.08.2018

"The decision to evacuate Ambae is based on solid science," said Sylvain Todman, a volcanologist who lived and worked in Vanuatu for a decade and a half, on August 2 in an interview with the Daily Post.

"The situation is probably not transient, and any announcement and decision by the government is based on good science, there are areas of concern at both ends of the island and at the top of Mount Lombenben.

The way in which the juvenile magma ascends under the Ambae volcano is not the same as that of the other volcanoes.

This kind of eruption is really stressful. Not only for the population, but also for the government. They must watch closely. It's a big and complex volcano."

The pressure is so intense under the island that the height of Mount Lombenben has changed from 10 to 15 centimeters. This was not the case a few months ago.

Gas emissions are one of the main reasons the volcano remains at level 3. "We have never seen so much sulfur dioxide from Ambae, historically speaking " , Todman said.

Ambae under the ashes ... only a few leaves remain green above the observers, to the left of the photo - Vanuatu Daily Post / Philippe Carillo doc.

Ambae under the ashes ... only a few leaves remain green above the observers, to the left of the photo - Vanuatu Daily Post / Philippe Carillo doc.

The problems do not concern only the island of Ambae, the inhabitants of Pentecost, located about 30 km to the east, say they are forgotten while the clean water of their island covered with ashes is exhausted. The inhabitants of North Pentecost said that the ashes had also smothered everything, the crops are destroyed and the airport closed.

The state of emergency in Ambae does not extend to Pentecost North, and nearly a week after the government declared that emergency supplies would be sent, locals say nothing has happened yet. .

Source: Vanuatu Daily Post and Vanuatu Red Cross

Vanuatu - impact of ashes on the island of Pentecost - photo Radio NZ 30.07.2018

Vanuatu - impact of ashes on the island of Pentecost - photo Radio NZ 30.07.2018

At Kilauea, the eruption of fissure 8 continues in the East rift zone: activity at the vent is low, with bubbling in the eastern part of the cone, and small fountains of lava in the western part. The level of lava in the channel is also lower than in previous days.

The laze plume at the entry of the lava at sea is blown out to sea, revealing the lava field with some incandescent spots.

At the top, a collapse occurred at 11:55 am HST on August 2, confirming that the interior subsidence of the edges and walls of Halema'uma'u continues.

Source HVO-USGS

Kilauea East rift zone - low activity at cone level on fissure 8 - photo HVO-USGS

Kilauea East rift zone - low activity at cone level on fissure 8 - photo HVO-USGS

Kilauea East rift zone - The south of the lava field, with some incandescent spots, and the laze plume to the sea - HVO-USGS photo

Kilauea East rift zone - The south of the lava field, with some incandescent spots, and the laze plume to the sea - HVO-USGS photo

In Iceland, GPS measurements from the Skaftá eastern cauldron, on the Vatnajökull, show that the ice shelf above the lake is lowering. This is an early sign of the appearance of a jökulhlaup, a glacial debacle, that will affect the Skaftá River in southern Iceland. The jökulhlaup is expected to reach the edge of Vatnajökull on Friday 3 August, with the peak of flooding possible in the early hours of Sunday 5 August.

Travelers are strongly advised to avoid traveling by the Skaftá River in the coming days. In addition to the floods along Skaftá, floodwater pollution could affect the area, especially around Skaftárjökull.

Source: IMO
 

The last jökulhlaup on the Skaftá River in 2015. - Photo: The Icelandic Road Administration

The last jökulhlaup on the Skaftá River in 2015. - Photo: The Icelandic Road Administration

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