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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

The Insivumeh informs in its report of June 12 at 7 am local an increase of the explosive activity of the Fuego, characterized by columns of ashes between 4,500 and 5,000 meters height asl., dispersed on 15 to 25 km to the northeast . Ashfall is likely to occur in Antigua Guatemala, Ciudad Vieja and San Miguel Duena.

Fuego - ash plume on 12.06.2018 - photo Emisoras Unidas / Erick Ramírez

Fuego - ash plume on 12.06.2018 - photo Emisoras Unidas / Erick Ramírez

At 7:35 local time, the observatory announces the descent of a pyroclastic flow in the Seca barranca, producing a curtain of ashes that reached 6,000 meters asl before dispersing to the north and north-east

The explosive activity causes avalanches that produce thick columns of ash, which disperse along the same axis.

These episodes are likely to impact the main drainages in the hours or days to come.

Fuego - preliminary maps of lahars threats with scenario in case of moderate rains (A), and more intense rains (B) - Doc.Insivumeh
Fuego - preliminary maps of lahars threats with scenario in case of moderate rains (A), and more intense rains (B) - Doc.Insivumeh

Fuego - preliminary maps of lahars threats with scenario in case of moderate rains (A), and more intense rains (B) - Doc.Insivumeh

To the danger created by the pyroclastic flows, is added that of the lahars caused by remobilization of the ashes following the heavy rains: the 11 of June at the end of the afternoon, hot lahars descended the barrancas Las Lajas and El Jute, made of fine and pasty materials, blocks of large diameter up to 3 meters, and trunks and branches; his measurements were 35 to 55 meters wide and 5 meters high.

Other lahars have been reported in the Seca and Mineral barrancas, with the risk of overflowing rivers.

A preliminary map of lahars threats with a scenario of moderate rains and more intense rainfall was published by Insivumeh, thanks to the help of various institutions.

Sources: Insivumeh Special Bulletins 57, 58, 59 and 60 / 12.06.2018

The Pacaya also shows a rise in activity, characterized by explosions up to 150 meters above the crater, and which generate vibrations and audible sounds to 10 km around.

Pacaya - RSAM on 12.06.2018 - Doc.Insivumeh

A risk of possible lava flow is mentioned.

Source: Special Bulletin of 12.06.2018

Kilauea East rift zone - lava fountains on the fissure 8 views during a clearing on 12.06.2018 / 5:45 - photo Bruce Omori / Paradise helicopters

Kilauea East rift zone - lava fountains on the fissure 8 views during a clearing on 12.06.2018 / 5:45 - photo Bruce Omori / Paradise helicopters

A line of closely spaced vents on fissure 8 in Kilauea's eastern rift zone continues to emit lava fountains as high as fifty meters, a height just above the cone spatter that partially surrounds it. The lava continues to feed the poured channel towards the ocean. A small overflow is observed on the east side of the casting, without significant extension on the ground.

The entrance to the sea at Kapoho is made in many places, marked by incandescence and small plumes, and two wider entries, characterized by larger plumes.

A weak spattering marks the crack 16/18 since the last days.

A field visit on June 12th at 17:29 HST by the HVO teams at the non eruptive cracks of the LERZ reveals a high temperature, up to 430 ° C / 806 ° F.

Kilauea East rift zone - thermal map of fissure system - 12.06.2018 / 14 h - HVO-USGS

Kilauea East rift zone - thermal map of fissure system - 12.06.2018 / 14 h - HVO-USGS

Kilauea East Rift Zone - Entry into the Ocean at Kapoho: Many lava fingers and incandescent points - Photo Bruce Omori / Paradise helicopters 12.06.2018 / 5h45
Kilauea East Rift Zone - Entry into the Ocean at Kapoho: Many lava fingers and incandescent points - Photo Bruce Omori / Paradise helicopters 12.06.2018 / 5h45

Kilauea East Rift Zone - Entry into the Ocean at Kapoho: Many lava fingers and incandescent points - Photo Bruce Omori / Paradise helicopters 12.06.2018 / 5h45

Kilauea East Rift Zone - Entry into the Ocean at Kapoho: Small and Large Plumes - Photo HVO-USGS 12.06.2018 / 6:50

Kilauea East Rift Zone - Entry into the Ocean at Kapoho: Small and Large Plumes - Photo HVO-USGS 12.06.2018 / 6:50

At the top, the crater of Halema'uma'u has seen its floor collapse over the past few weeks: a large part is 100 meters below the edge, and the deepest part is 300 meters below the edge. Deep cracks intersect the former visitors' car park, closed in 2008 when the active vent was opened.

Source: HVO-USGS

Kilauea summit - collapse of the crater Halema'uma'u and cracks on the edges ( to the left of the photo) - Doc HVO-USGS 12.06.2018

Kilauea summit - collapse of the crater Halema'uma'u and cracks on the edges ( to the left of the photo) - Doc HVO-USGS 12.06.2018

The Agung, still on alert level III with a danger zone of 4 km radius, issued on June 13 at 11:05 local a plume of ash that rose about 2,000 meters above the summit, leaning to the south -Where is.

The VONA code is orange.

Sources: PVMBG & Magma Indonesia

Agung - plume of the 13.06.2018 / 11:09 local - doc.PVMBG

Agung - plume of the 13.06.2018 / 11:09 local - doc.PVMBG

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