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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 : #volcanic activity
Karangetang - the lava flow, of consistent thickness, crosses the coastal road this 05.02.2019 - photo Malahasa Garing / Facabook

Karangetang - the lava flow, of consistent thickness, crosses the coastal road this 05.02.2019 - photo Malahasa Garing / Facabook

The PVMBG Eastern Region Manager, Dr.Devy Insan Kamil, reports that lava is still being produced by Karangetang, and continues its advance towards the ocean. Yesterday, the lava was very close to the coastal road, which it crossed this February 5th.

Update: the lava flow has reached the sea ... see the video below.

Communities around Karangetang in the northwestern region of Kawah Dua, including the village of Niambangeng, the village of Beba and the village of Batubulan, must be evacuated to a place safe from the threat of lava or  pyroclastics flows of the Karangetang mountain range.

People who live around the rivers and come from the summit of Mount Karangetang to better prepare for the potential threat of lahars and sudden floods that can spread on the coast.

Karangetang's activity level remains at 3, with a 2.5km no-go area around the craters, 3km to the ONO and 4km to the north.

 

Sources: PVMBG, Tempo, Malahasa Garing via Shérine France

Karangetang - lava flow, consistent thickness, continues to the ocean - 05.02.2019 - photo Malahasa Garing / Facabook

Karangetang - lava flow, consistent thickness, continues to the ocean - 05.02.2019 - photo Malahasa Garing / Facabook

Karangetang - the lava flow reaching the sea - video sulutdaily com

This 3D image of the northern flank of Karakgetang shows the terrain accidents responsible for the more or less rapid advance of the lava flow - Doc. Copernicus 03.02.2019

This 3D image of the northern flank of Karakgetang shows the terrain accidents responsible for the more or less rapid advance of the lava flow - Doc. Copernicus 03.02.2019

Karangetang - new risk map - Doc. PVMBG

Karangetang - new risk map - Doc. PVMBG

Karangetang - thermal anomalies on 04.02.2019 and distance to the summit - Doc. Mirova - one click to enlargeKarangetang - thermal anomalies on 04.02.2019 and distance to the summit - Doc. Mirova - one click to enlarge

Karangetang - thermal anomalies on 04.02.2019 and distance to the summit - Doc. Mirova - one click to enlarge

In Chile, the Planchon-Peteroa is still the site of emissions of ash and gas about 500-1,000 meters above the volcano, with a dispersion to the east.

The technical alert of Sernageomin remains in amarillo.

Sources: CNEA - SEGEMAR images

Peteroa - ash emissions on 04.02.2019, at 10:01, 12:31 and 16:11 - Photos CNEA - SEGEMAR - one click to enlarge
Peteroa - ash emissions on 04.02.2019, at 10:01, 12:31 and 16:11 - Photos CNEA - SEGEMAR - one click to enlargePeteroa - ash emissions on 04.02.2019, at 10:01, 12:31 and 16:11 - Photos CNEA - SEGEMAR - one click to enlarge

Peteroa - ash emissions on 04.02.2019, at 10:01, 12:31 and 16:11 - Photos CNEA - SEGEMAR - one click to enlarge

An article in Nature / Scientific Reports reveals a research in progress for two years: a battalion of seismometers-underwater robots, called MERMAIDS, was dropped near the Galapagos archipelago to detect the possible mantle plume fueling volcanism .

These robots float freely at 1,600 meters below the surface, and scrutinize the earthquakes; each earthquake recording, they go back to the surface, to determine their location by GPS, and take advantage of this to transmit their data.

Galapagos - earthquakes measured by floating Mermaids for mantle plume detection - Credit: Princeton University

Galapagos - earthquakes measured by floating Mermaids for mantle plume detection - Credit: Princeton University

Tomographic result showing the P-velocity anomaly of the Galápagos plume in two perpendicular depth sections viewed from the East (left) or South (right). - Doc. Nature ref in source

Tomographic result showing the P-velocity anomaly of the Galápagos plume in two perpendicular depth sections viewed from the East (left) or South (right). - Doc. Nature ref in source

This seismic tomography study shows that the Galapagos are fed by an almost vertical high temperature plume of about 1,900 km deep, and 200-300 km wide, located below 0 ° N, 91 ° W, characterized by a much larger heat flux than predicted by previous bathymetry. 

The decrease in the plume temperature anomaly towards the surface indicates that the Earth's mantle has a sub-adiabatic temperature gradient, ie. a variation of temperature of the water with the depth depending only on the pressure.

 

Source: Nature / Scientific Reports - OPEN article published 04.02.2019 - Imaging the Galapagos feather with an unconventional application of floating seismometers - by G.Nolet & al.

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