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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

At the Agung, after the strong strombolian eruption of July 2, a few plumes of ashes were emitted in the following days.

On July 6 in the early evening, around 19:21, we could observe the incandescence at the top, and a vague black plume folded down on one of the flanks.
 

 Agung - Incandescence 06.07.2018 / 19h29 local - photo Øystein L. Andersen

Agung - Incandescence 06.07.2018 / 19h29 local - photo Øystein L. Andersen

 Agung - Strombolian activity from 08.07.2018 / 5h30 photo PVMBG

Agung - Strombolian activity from 08.07.2018 / 5h30 photo PVMBG

The PVMBG reports a new strombolian eruption on July 8 at 4:22 am WIB.

It was followed at 10 am local time by an ash emission, following an eruption of a duration of 150 sec., with a record of an amplitude of 24 mm on the seismogram.

New ash emission at 16:00 local time.

Sources: PVMBG & Magma Indonesia

Agung - ash emission on 08.07.2018 / 11:36 local - photo Øystein L. Andersen

Agung - ash emission on 08.07.2018 / 11:36 local - photo Øystein L. Andersen

Agung - ash emission on 08.07.2018 / 16:01 local - photo Øystein L. Andersen

Agung - ash emission on 08.07.2018 / 16:01 local - photo Øystein L. Andersen

Agung - distribution of ashes to the West - Doc.PVMBG

Agung - distribution of ashes to the West - Doc.PVMBG

In Sierra Negra / Galapagos, the Sentinel 2 satellite shows on July 6 a bifid lava flow and incandescence at the seaside.

Thermal anomalies are observed by Mirova.

Sierra Negra - 06.07.2018 - thermal anomaly and bifid lava flow - image Sentinel 2 SWIR 06.07.2018

Sierra Negra - 06.07.2018 - thermal anomaly and bifid lava flow - image Sentinel 2 SWIR 06.07.2018

Sierra Negra - 06.07.2018 - eruptive plume, lava flow and incandescence by the sea - image Sentinel 2 IR 06.07.2018

Sierra Negra - 06.07.2018 - eruptive plume, lava flow and incandescence by the sea - image Sentinel 2 IR 06.07.2018

 Sierra Negra - thermal anomalies remain very high - doc.Mirova Modis 07.07.2018 / 04h

Sierra Negra - thermal anomalies remain very high - doc.Mirova Modis 07.07.2018 / 04h

At the seismicity level, 106 volcano-tectonic earthquakes, 51 LP earthquakes and 3 VLPs were recorded between 5 and 6 July at 11am; the observatory mentions moreover, a signal of tremor, precursor of eruptive activity, from 17h TG on July 7th.

Source: IGEPN

Sierra Negra - a tremor signal, a precursor of eruptive activity, from 17:00 GMT on 7 July 2018 (bottom on the seismogram) - doc.IGEPN

Sierra Negra - a tremor signal, a precursor of eruptive activity, from 17:00 GMT on 7 July 2018 (bottom on the seismogram) - doc.IGEPN

Insivumeh reports, in its report of July 7 at 22h. local, an increase of activity in Pacaya; Seismicity is characterized by an increase in the internal tremor due to the rise of the magma.

A lava flow originating from the Mackenney crater, 30 meters wide and 400 meters long for the moment, is heading north.

Sources: Insivumeh & Conred

Pacaya - 07.07.2018 - lava flow - photo Conred

Pacaya - 07.07.2018 - lava flow - photo Conred

In Chile, Sernageomin raised the technical alert level of the Planchón-Peteroa to yellow / level 2 out of 4, following an increase in seismicity and outgassing on 6 July 2018; the Civil Protection advises to respect the zone of security of 3 km around the active craters.

Seismicity consists of volcano-tectonic earthquakes, of a magnitude max. of 1.3 to about 5.000 meters deep at the NW of the volcanic complex, and LP earthquakes, related to the dynamics of the fluids. The tremor is also rising.

The last eruptive phase of the Planchón-Peteroa started on February 17, 2011 and ended on June 26, 2011, qualified as a VEI 3.

Sources: Sernageomin & GVP
 

Planchón-Peteroa - technical alert Amarilla - 06.07.2018 - Doc.Sernageomin

Planchón-Peteroa - technical alert Amarilla - 06.07.2018 - Doc.Sernageomin

In Kilauea, the thermal images of the lava flow show that it no longer reaches the coast: the flow seems to stagnate on July 7 about 2 km inland, but however, lava is oozing into the ocean from multiple points primarily along the northern section of a broad flow front.

In addition, multiple ooze-outs fed flows on the north and the southwest edge of the main `a`a flow but neither had lava actively entering the ocean.

 

Kilauea summit zone - strong fractures on a satellite image worldView 3 on July 3 - Doc.HVO-USGS

Kilauea summit zone - strong fractures on a satellite image worldView 3 on July 3 - Doc.HVO-USGS

At the top, a WorldView-3 satellite view unveils the most important fractures in the caldera; the floor of the crater of Halama'uma'u is covered with rubble.

Source: HVO-USGS

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