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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 - a scar seems to mark the summit of the volcano - photo 2018.06.08 / Marcela López Gálvez / elPeriódico

Fuego - a scar seems to mark the summit of the volcano - photo 2018.06.08 / Marcela López Gálvez / elPeriódico

In Guatemala, the pyroclastic flows succeeded one another on the 8th and during the night of June 8th to 9th in Fuego.

This new supply of ash will hinder relief operations, such as lahars, caused by remobilization of ashes by heavy rains.

The drainages Las Lajas and El Jute, on the eastern slope of the volcano, remain at very high risk. The cause of the continuation of pyroclastic flows outside paroxysm leaves some uncertainty about what causes them ... a scar seems to mark the top of the Fuego in some photos.

Fuego - map of exposition to ash and pyroclastic flows - Doc. 2018.06.08 Pacific Disaster Center

Fuego - map of exposition to ash and pyroclastic flows - Doc. 2018.06.08 Pacific Disaster Center

Observation of Fuego volcano eruption by Daichi satellite 2 Color synthesis of intensity images around Mount Fuego using observational data on June 7, 2018 and May 24, 2018. The color red is attributed to the flows pyroclastics, towards the west and south-east. - Doc. JAXA / Japan

Observation of Fuego volcano eruption by Daichi satellite 2 Color synthesis of intensity images around Mount Fuego using observational data on June 7, 2018 and May 24, 2018. The color red is attributed to the flows pyroclastics, towards the west and south-east. - Doc. JAXA / Japan

After the eruption, the controversy swells about the responsibilities of the supervisory authorities, Insivumeh and Conred ... case to follow.

Note that Conred has just released an information note on the difference between lava flows and pyroclastic flows.

Sources: Insivumeh, Conred, and local press.

Differences between lava flows and pyroclastic flows - Doc. Conred

Differences between lava flows and pyroclastic flows - Doc. Conred

The front page of the newspaper La Hora of 06.06.2018 seems to put back the two supervisory authorities of the Fuego

The front page of the newspaper La Hora of 06.06.2018 seems to put back the two supervisory authorities of the Fuego

Not much change at Kilauea yesterday:

The fountaining on the fissure 8 remains important, and the channelized lava joins the ocean, where the plumes are however smaller because of the change in the atmospheric conditions.

Incandescence is observed at fissure 22, as well as minor lava activity at fissures16 / 18. Less degassing marks cracks 24, 9 and 10.

Kilauea East rift zone - 09.06.2018 5h45 - fountaining on fissure 8 and channelised lava flow - photo Bruce Omori

Kilauea East rift zone - 09.06.2018 5h45 - fountaining on fissure 8 and channelised lava flow - photo Bruce Omori

Kilauea East Rift Zone - 09.06.2018 / 6.30am - New Coastline at Kapoho - Photo HVO-USGS

Kilauea East Rift Zone - 09.06.2018 / 6.30am - New Coastline at Kapoho - Photo HVO-USGS

Activity on the fissure 8 - to watch in full screen - video USGS

At the top, a small explosion occurred at 4:48 HST, accompanied by a seismic signal similar to an earthquake of M 4.3. Fallout ash can impact the southern part of the island.

Steam plumes are observed in the crater, and adjacent cracks.

Source: HVO-USGS

Kilauea summit - cracking and sagging walls of Halema'uma 'u - picture HVO-USGS 09.06.2018

Kilauea summit -  Cracking and slumping of the Halema‘uma‘u crater walls are clearly evident in this aerial view captured during HVO's overflight of Kīlauea's summit this 09.06.2018

Kilauea summit - Cracking and slumping of the Halema‘uma‘u crater walls are clearly evident in this aerial view captured during HVO's overflight of Kīlauea's summit this 09.06.2018

Ambae - volcano activity safety map - Doc. VGO

Ambae - volcano activity safety map - Doc. VGO

The Volcanological Observatory of Vanuatu has lowered the alert level of the Ambae volcano on June 7 to 2, due to the stabilization of its activity.
The danger zone is now limited to 2 km radius around the active Voui Lake's vent, and to the areas in the yellow zone (see map). There are no more explosions or volcanic plumes issued since May. However, the ashes emitted during the last eruption can modify the behavior of streams, produce floods, carry debris and cause landslides during periods of heavy rain.
Volcanic activity remains marked by instability, characterized by emissions of vapors and / or volcanic gases.
Source: Vanuatu Geohazards Observatory

Top of the Agung and lava dome in the crater - photo attached to the report of 07.06.2018 / PVMBG

Top of the Agung and lava dome in the crater - photo attached to the report of 07.06.2018 / PVMBG

The PVMBG issued an opinion assessing Agung's activity as at 7 June 2018.

The last eruption took place on May 29 at 5:39 pm, accompanied by a plume of ash that reached a height of 500 meters above the summit. The last VONA report is orange.

The most recent volume of the lava dome is estimated at 23 million cubic meters, one-third of the empty volume of the crater.

Agung - seismicity from March 12 to June 9, 2018 - Doc. Magma Indonesia

Agung - seismicity from March 12 to June 9, 2018 - Doc. Magma Indonesia

High and low frequency earthquakes are still recorded indicating magma movement from depth to surface.

At the deformation level, for the short term starting from the second week of May 2018 to the present, the trend of inflation is observed on the GPS or Tiltmeter network. The result of the deformation modeling indicates that there is still a build up of magma pressure at a depth of about 3-4 km below the summit.

The SO2 measured using the DOAS scanner shows a flow of between 90 and 203 tonnes / day.

The satellites still record the existence of hot spots in Mount Agung crater, indicating the possibility of a low-level spilling on the surface of the crater.

 

As a result, Gunung Agung's level of activity is still at Level III (Standby). The volcanic activity of Gunung Agung is still relatively high, not yet stable and still has an eruptive potential located within a radius of 4 km from the summit. Outside the area, the community can do usual activities. For now, there is still no need for evacuation.

Source: PVMBG / Magma Indonesia

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