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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
Fuego - avalanche in the barranca Las Lajas on 07.09.2018 - photo Conred

Fuego - avalanche in the barranca Las Lajas on 07.09.2018 - photo Conred

On 7 September at 7:31 local time, an avalanche occurred on one of the flanks of Fuego. It was caused by a crack in the upper part of the Barranca Las Lajas, the destabilization of materials accumulated during the eruption of June 3, and preceded by a small ash emission from a vent located lower down the slope.

As a security measure, National Highway 14 was closed, and personnel working in the area and the Volcano Prevention Unit were evacuated.

Fuego - on the left, seismogram showing weak to moderate activity - right, lateral explodes - Doc. Insivumeh 07,09,2018

During the last 24 hours, the Fuego has maintained between 5 and 12 low to moderate hourly explosions, accompanied by ashes and gas reaching 4,700 meters above sea level, before moving west-southwest 15 km

Sources: Insivumeh and Conred

Fuego - 07.09.2018 - Insivumeh's check flight after the avalanche - photo Insivumeh

Fuego - 07.09.2018 - Insivumeh's check flight after the avalanche - photo Insivumeh

At Veniaminof, the days of September 5 and 6 were marked by pulsating ash emissions, whose plumes were noticed by Perryville's webcam; a volcanic cloud was spotted by a pilot and small amounts of ash deposited on the ice field.

A vent has visible thermal anomalies by satellite.

The latter is still observed on September 7, and the incandescence at the top ... which suggests fountaining at the top of Veniaminof.

The aviation code remains orange and the volcanic alert to Watch.

Source: AVO

Veniaminof - the summit on 02.04.2018 / 15:45 - photo Dan Pepin / AVO

Veniaminof - the summit on 02.04.2018 / 15:45 - photo Dan Pepin / AVO

Since the beginning of September, inflation (swelling) of the base and the top of the Piton de la Fournaise building has been observed again by the OVPF deformation network. This recovery in inflation is accompanied by a low seismicity. This inflation is for the moment slow and its evolution will be to follow these next days.

Piton de la Fournaise - Illustration of the deformation since 01/08/2018. Here are shown baselines (variation of distance between two GPS receivers) crossing the Piton de la Fournaise building, at the top (at the top), at the base of the terminal cone (in the middle) and in the far field (at the bottom ). A rise is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. (© OVPF-IPGP)

Piton de la Fournaise - Illustration of the deformation since 01/08/2018. Here are shown baselines (variation of distance between two GPS receivers) crossing the Piton de la Fournaise building, at the top (at the top), at the base of the terminal cone (in the middle) and in the far field (at the bottom ). A rise is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. (© OVPF-IPGP)

This recovery of the building's inflation is synonymous with a pressurization of the superficial magmatic reservoir.

The CO2 concentrations in the far-field soil (Plaine des Cafres and Plaine des Palmistes sectors), which have been maintained at intermediate values ​​since the end of the eruption on 13 July last, are consistent with a deep rise in magma. . The change in trend observed in the deformations of the building (resumption of inflation) since early September attests to a possible transfer to lower depths (to the superficial reservoir).

It should be noted that such pressurization phases had preceded by about three weeks the eruption of April 27 - June 1, 2018, and one week only the eruption of July 13, 2018, before the roof of the tank is weakened and does not breaks, giving rise to an injection of magma towards the surface and an eruption.

Source: OVPF

Kilauea East rift zone - No incandescence or spattering on cone of fissure 8 - 06.09.2018 / 8 am - photo HVO-USGS

Kilauea East rift zone - No incandescence or spattering on cone of fissure 8 - 06.09.2018 / 8 am - photo HVO-USGS

In the East rift zone of Kilauea, no incandescence or spattering is visible this September 7th during the overflight; the recent small flow observed within the cone on fissure 8 did not extend beyond the cone boundaries; The general activity has not changed in the last days.

The overflight of the crater of Pu'u O'o allowed to observe there an important degassing of steam, but no presence of lava.

Sources: HVO-USGS and Paradise Helicopters

The conferences of Cities on Volcanoes 10 are finished, and before getting a summary, two things have to report:

- The first IAVCEI prize for monitoring and managing volcanic crises was awarded to the Indonesian PVMBG.

Congratulations to the PVMBG and Magma Indonesia teams..

The first IAVCEI prize for monitoring and managing volcanic crises was awarded to the Indonesian PVMBG. Congratulations to the PVMBG and Magma Indonesia teams

The first IAVCEI prize for monitoring and managing volcanic crises was awarded to the Indonesian PVMBG. Congratulations to the PVMBG and Magma Indonesia teams

The importance of social networks in communication during crises was mentioned by Dr. Janine Krippner and Dr. Jessica Ball, both bloggers, and respectively about the eruptions of Agung and Kilauea.

The need for social media involvement in responding to these crisis situations, and the modalities of interaction were mentioned, as well as the establishment of guidelines for those who share this volcanic information.

Rendez-vous was taken in Heraklion, Crete for the next meeting Cities on volcanoes 11 in 2020.

Source: #COV10

Conferences of Dr. Krippner and Ball on the importance of social networks in communication in crisis situations - CVO10 photos - One click to enlarge
Conferences of Dr. Krippner and Ball on the importance of social networks in communication in crisis situations - CVO10 photos - One click to enlarge

Conferences of Dr. Krippner and Ball on the importance of social networks in communication in crisis situations - CVO10 photos - One click to enlarge

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