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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 - entry into the sea through steam and rain 09.07.2018 - photo HVO-USGS

Kilauea East rift zone - entry into the sea through steam and rain 09.07.2018 - photo HVO-USGS

At Kilauea, many changes took place on July 9 in the East Rift Zone.

Multiple overflows of the main lava channel occurred between the Y-intersection of Pohoiki road and an area west of Kapoho Crater.

The lower part of the main lava channel has also undergone a significant reorganization: the open channel near four corners is now crusted, and plumes at the entrance to the ocean are greatly reduced.

The volumes of lava emitted by fissure 8 remain high, which augurs for changes in the following days.

The fissure 22 continues to show a weak spattering.

Kilauea East rift zone - thermal image and map of the flows and fissures on 09.07.2018 / 14h - Maps HVO-USGS
Kilauea East rift zone - thermal image and map of the flows and fissures on 09.07.2018 / 14h - Maps HVO-USGS

Kilauea East rift zone - thermal image and map of the flows and fissures on 09.07.2018 / 14h - Maps HVO-USGS

Kilauea East rift zone - lava flow blocking near crater Kapoho - photo Aloha Skies aviation 08.07.2018

Kilauea East rift zone - lava flow blocking near crater Kapoho - photo Aloha Skies aviation 08.07.2018

At the top, an explosion / collapse occurred on July 9 at 9:20 am HST. The sliding of the edges and internal walls of Halema'uma'u continues in response to the current subsidence of the summit.

Source: HVO-USGS

Kilauea Halema'uma'u - Small plume, gray-pink color, developing on the left of the image on 09.07.2018 / 9:20 HST, after the explosion and the collapse at the top- photo HVO-USGS

Kilauea Halema'uma'u - Small plume, gray-pink color, developing on the left of the image on 09.07.2018 / 9:20 HST, after the explosion and the collapse at the top- photo HVO-USGS

In the Galapagos Islands, the Sierra Negra Volcano on Isabela still shows a high level of activity.

The eruptive process continues, as evidenced by numerous volcano-tectonic earthquakes and emission tremor; thermal anomalies are noted as well as the emission of a plume of vapor, gas and ash rising to 2,400 meters in height, then moving towards the southwest (zone surrounded by red on the Goes-16 satellite image) , sparing the populated areas for the moment.

Lava flows come from a source located in the lower part of the northwestern flank of the volcano; the emission of lava would have increased significantly since July 7 at 17h local.

Sources: IGEPN, Mirova and Goes -16 satellite

Sierra Negra - eruptive plume (surrounded by a red line) stretching towards the SO - doc. Goes satellite 09.07.2018 / 7:12 am TG via IGEPN

Sierra Negra - eruptive plume (surrounded by a red line) stretching towards the SO - doc. Goes satellite 09.07.2018 / 7:12 am TG via IGEPN

Sierra Negra - thermal anomalies from 07 to 09.07.2018 - Doc .Mirova Modis

Sierra Negra - thermal anomalies from 07 to 09.07.2018 - Doc .Mirova Modis

In Colombia, volcano-tectonic earthquakes are multiplying in Nevado del Huila complex:

Since July 6, a seismic swarm has been registered; the most important volcano-tectonic earthquakes will be recorded respectively on July 6 at 19:19 local of M4,5; on July 7 at 6:43 local of M3,4 then at 11:06 local, two earthquakes of M 3,3 and 3,5; July 10 at 0h16 of M4.2.

These earthquakes are located in an area 15 km north-east of the Pico Central volcanic complex, and a depth of between 7 and 11 km from the summit which rises to 5,364 meters.
 

Nevado del Huila - volcano-tectonic earthquake of the 10.07.2018 / 00h16 loc. Magnitude 4.2 - SGC map

Nevado del Huila - volcano-tectonic earthquake of the 10.07.2018 / 00h16 loc. Magnitude 4.2 - SGC map

The Nevado del Huila complex, with its four summits: Pico Norte (N), Pico la Cresta (LC), Pico Central (C), and Pico Sur (S) - GVP-doc. GVP
The Nevado del Huila complex, with its four summits: Pico Norte (N), Pico la Cresta (LC), Pico Central (C), and Pico Sur (S) - GVP-doc. GVP

The Nevado del Huila complex, with its four summits: Pico Norte (N), Pico la Cresta (LC), Pico Central (C), and Pico Sur (S) - GVP-doc. GVP

The level of activity remains in Amarillo / III in the absence of variations of the other parameters.

The last periods of eruption are dated between October 2008 and January 2012, on the upper southwest flank of Pico Central, and referred to as an IEV 3.

Source: Servicio Geologico Columbiano
 

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