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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
 Piton de La Fournaise - Dolomieu crater - photo © Bernard Duyck 17

Piton de La Fournaise - Dolomieu crater - photo © Bernard Duyck 17

At Piton de La Fournaise, the resumption of seismicity and inflation since June 16, as well as the high fluxes of CO2 in the soil (despite a decreasing trend) witnessed a resumption of pressurization of superficial magmatic reservoir and its replenishment by deep magmas since mid-June.

From June 16 an increase in seismic activity was recorded with an average of 5 superficial volcano-tectonic earthquakes per day and a maximum of 11 events on June 24, located in the summit area.

OVPF deformation measurement networks recorded a resumption of inflation (swelling) of the building around June 16. Thus between June 16 and 30 an elongation of about 2.5 cm max. of the summit area and an elongation of about 3.3 cm max. from the base of the terminal cone were recorded. Numerical models of these deformations show the activation of a pressure source around 1.5 km deep under the Dolomieu crater, corresponding to the pressurization of the surface magmatic reservoir.

 

Source: OVPF

Piton de La Fournaise - Illustration of the deformation over the last six months (the eruptive periods are shown in red). Here are shown the variations in distance between two GPS receivers crossing the Piton de la Fournaise building, at the top (reference BOMG; top), at the base of the terminal cone (reference FJAG; in the middle) and in the far field (reference PRAG; below) (see location in Figure 5). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano (© OVPFIPGP).

Piton de La Fournaise - Illustration of the deformation over the last six months (the eruptive periods are shown in red). Here are shown the variations in distance between two GPS receivers crossing the Piton de la Fournaise building, at the top (reference BOMG; top), at the base of the terminal cone (reference FJAG; in the middle) and in the far field (reference PRAG; below) (see location in Figure 5). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano (© OVPFIPGP).

On the evening of July 1, the Copete camera of the El Reventador volcano shows an explosion that produced an eruptive column 1 km above the crater, and the generation of small pyroclastic flows restricted to the volcanic cone. The eruptive plume is heading west, and should not reach the populations of the Inter-Andean Valley.

Night glow is visible in the crater.

The alert level is Naranja. IGEPN reports moderate surface activity and high internal activity.

 

Source IGEPN

Reventador - 01.07.2020 / 22:29 - IGEPN webcam

Reventador - 01.07.2020 / 22:29 - IGEPN webcam

Reventador / Ecuador - 01.07.2020 - Volcano Time-Lapse / IGEPN images

JMA reports an eruption on Suwanosejima, this July 2, 2020 at 8h36 loc., Accompanied by a colorful plume rising 1,000 meters above the Mitake crater, before drifting east.

 

Source: Japan Meteorological Agency

Suwanosejima - 02.07.2020 / 8h33-34 - JMA webcams

Suwanosejima - 02.07.2020 / 8h33-34 - JMA webcams

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