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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
Kilauea East Rift Zone - 19.07.2018- A new black sand beach was created by the advance of the streams that covered the Bowls area and stopped for a moment before Shacks - photo Bruce Omori

Kilauea East Rift Zone - 19.07.2018- A new black sand beach was created by the advance of the streams that covered the Bowls area and stopped for a moment before Shacks - photo Bruce Omori

In the eastern rift zone of Kilauea, only fissure 8 remains active, and feeds the channelized lava flow. The most vigorous entry of the lava into the ocean is located a few hundred meters NE of the southern edge of the flow, producing a plume of laze. The southern edge of the stream remains approximately 500 meters from Isaac Hale Park boat ramp.

The underwater interaction between magma and water can cause explosions and ejections of debris in a hazardous area along the coast; Significant upwelling occurs at the ocean entry, as molten lava pours into the sea beneath the surface, creating an underwater plume of turbidity.

Kilauea East rift zone - 19.07.2018 - Upwelling occurs at the ocean entry, as molten lava pours into the sea beneath the surface, creating an underwater plume of turbidity. - photo Bruce Omori

Kilauea East rift zone - 19.07.2018 - Upwelling occurs at the ocean entry, as molten lava pours into the sea beneath the surface, creating an underwater plume of turbidity. - photo Bruce Omori

Kilauea East rift zone - map of the flow of the fissure 8 and entries at sea - Doc.HVO-USGS 19.07.2018 / 12 pm

Kilauea East rift zone - map of the flow of the fissure 8 and entries at sea - Doc.HVO-USGS 19.07.2018 / 12 pm

An analysis by the USGS mentions that the volume of lava erupted during the current period of activity exceeds that of previous eruptions. The most likely conclusion is that the eruption in LERZ could continue for months to years.

The complete text and argumentation developed by the USGS is accessible via this link / Preliminary analysis of the Kīlauea volcano eruption underway in the Lower East Rift Zone (LERZ): fissure 8 Prognosis and Continuous Hazards prepared by the Geological Observatory of the United States of America Volcano Hawaiian Volcano Observatory

Source: HVO-USGS
 

 Ambae - safety map - Doc. VGO

Ambae - safety map - Doc. VGO

The alert level for Ambae has been raised to 3.

Following the observation flights of 13 and 20 July, it is confirmed that the volcanic activity is limited to a vent in Lake Voui, and consists of explosions, which are accompanied by ejection of incandescent rocks and sustained emissions of ashes. The population of Ambae and neighboring islands can hear roars, the sound of explosions, smell volcanic gases, observe plumes of gas and ashes as well as nighttime glow.

The danger zone is limited to 3 km radius around the active vent and to the targeted areas of the yellow zone (see map). The presence of ash continues to alter the behavior of rivers and streams in the event of rains, with the risk of changes of course due to debris dams, and landslides.

Source: VGO

Ambae - SO2 cloud 21.07.2018 /  Suomi NPP OMPS - via Philpson Bani IRD

Ambae - SO2 cloud 21.07.2018 / Suomi NPP OMPS - via Philpson Bani IRD

Ambae - webcam image 22.07.2018 / 17:45 local time - VGO

Ambae - webcam image 22.07.2018 / 17:45 local time - VGO

In Villarica, a reconnaissance of the crater, carried out by the POVI teams on July 20, made it possible to check a rise of the level of lava in the well; it is again possible to observe the source of incandescence and lava splashing from the edges of the crater.

Source: Werner Keller - POVI Team / Fundación Volcanes de Chile

Villarica - 21.07.2018 - night activity - photo Javier Sepúlveda / via La Voz de Pucon

Villarica - 21.07.2018 - night activity - photo Javier Sepúlveda / via La Voz de Pucon

Some news of Indonesian volcanoes:

An eruption marked the Agung on July 21 at 11:49; it was accompanied by a plume of ashes rising to 1,500 meters above the summit, leaning towards the west.

The Krakatau, in alert level 2 and VONA orange, keeps its explosive activity of high level since June 18, 2018.

At Merapi, the observatory reports white fumaroles of about ten meters high in the crater, and a temperature of 152.7 ° C maximum.

The Kerinci, considered the highest point in Sumatra, has a thick and white plume of gas and vapor, rising 400-500 meters above the summit. Its last eruption was 5-10,06,2018

Sources: PVMBG, Magma Indonesia

Agung - 21.07.2018 / 11h56 WITA - photo PVMBG

Agung - 21.07.2018 / 11h56 WITA - photo PVMBG

Merapi - 22.07.2018 / 6h09 - plume of gas and steam & temperatures in the crater - Doc.PVMBG
Merapi - 22.07.2018 / 6h09 - plume of gas and steam & temperatures in the crater - Doc.PVMBG

Merapi - 22.07.2018 / 6h09 - plume of gas and steam & temperatures in the crater - Doc.PVMBG

Kerinci - 22.07.2018 / 07:30 local - photo Magma Indonesia / PVMBG

Kerinci - 22.07.2018 / 07:30 local - photo Magma Indonesia / PVMBG

Wai-O-Tapu Mud eruption - photo Thomas Rodda

A rare occasional mud eruption with a duration of about 40 seconds was observed south of Wai-O-Tapu / Roturoa, New Zealand.

The volcanic geothermal site is considered to be New Zealand's "Mini-Yellowstone" (at a high price), and is home to hot springs, bubbling mud pools.

 

Source: Brad Scott / GNS via NZ Herald

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