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Earth of fire

Actualité volcanique, Article de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
Etna - le front de lave le 28.02.2017 - photo Boris Behncke

Etna - le front de lave le 28.02.2017 - photo Boris Behncke

On 1 March, the strombolian activity was maintained at Etna, with a rapid growth of the pyroclastic cone, both in height and in width; Its base is began to fill the depression of the new southeast crater / NSEC. The lava front stabilized at 1,500 meters from the active vent, and an altitude of 2,700 meters.
At the end of the evening, activity weakened, the amplitude of the tremor decreased rapidly and activity stopped around 11:30 pm local time.
 
Sources: INGV Catania

Etna - trémor on 02.03.2017 / 10h14 - doc. INGV Catania

Etna - trémor on 02.03.2017 / 10h14 - doc. INGV Catania

Etna - evolution of the new pyroclastic cone on 02.03.2017 - photo Boris Behncke

Etna - evolution of the new pyroclastic cone on 02.03.2017 - photo Boris Behncke

The monthly bulletin of the OVPF summarizes the characteristics of the last eruption of La Fournaise:
During this eruption, less than 10 million m3 of lava flows were emitted on the surface (between 3 and 8 Mm3 according to the estimation methods).

Piton de La Fournaise - Evolution of the extension of the flows during the eruption of 31 January - 27 February 2017. (© OVPF / IPGP))

Piton de La Fournaise - Evolution of the extension of the flows during the eruption of 31 January - 27 February 2017. (© OVPF / IPGP))

Piton de La Fournaise - Surface displacements associated with magma migration to the eruptive site (January 31st). The vectors represent the horizontal displacements (scale in meters given by the value MAX VECTOR) and the colored circles the vertical displacements (scale in meters given by the colored bar). (© OVPF / IPGP)

Piton de La Fournaise - Surface displacements associated with magma migration to the eruptive site (January 31st). The vectors represent the horizontal displacements (scale in meters given by the value MAX VECTOR) and the colored circles the vertical displacements (scale in meters given by the colored bar). (© OVPF / IPGP)

The outlines and the volumes of the surface runoffs have changed little during the last two weeks of eruption due to extremely low surface flows in the second half of the eruption (<1 m3 / sec). The deformations associated with magma migration to the eruptive site (January 31st) focused on the southern and eastern part of the volcano and did not exceed 30 centimeters.
During the eruption and since its eruption on 27 February, inflation (swelling) of the terminal cone continues continuously (about 1 cm of elongation of the summit in one month).
At the same time, CO2 concentrations in the soil at the level of the volcano deposit remain high and the deep seismicity (ca -20 km below sea level) under the western flank of the volcano (Plaine des Palmistes) began to increase Since about 17 February.
These parameters demonstrate depth pressurization and upwelling of fluid from the deep to the more superficial storage areas below the summit craters (ca. 2 km below the surface).


Source: OVPF

Klyuchevskoy - image archives - photo 03.09.2016 / Romanova I.M., IVS FEB RAS

Klyuchevskoy - image archives - photo 03.09.2016 / Romanova I.M., IVS FEB RAS

The aviation alert level of the Klyuchevskoy was elevated to orange, as a result of sporadic ash emissions. On 2 March, the KVERT reported a rising activity and a gas and ash plume rising between 8,000 and 9,000 meters asl, before drifting towards the northeast on 25 km.


Source: KVERT

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