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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

On the evening of December 28, an explosive strombolian-type activity animates the craters of Voragine and south-eastern of Etna.

Etna - in the evening of 28.12.2020, strombolian activity with voragine and south-east - photo Boris Behncke

Etna - in the evening of 28.12.2020, strombolian activity with voragine and south-east - photo Boris Behncke

From 06:50 UTC, on December 29, the video surveillance network showed an intensification of the explosive strombolian activity at the eastern mouth of the southeast crater, with associated ash emission. Strong winds at high altitude disperse them quickly in the ENE direction.

At around 08:00 UTC, this activity intensified further, to produce the launch of coarse pyroclastic material on the crater rim, which fell copiously on the east side of the SE crater cone.

From 09.00 hours, UTC, the intensity of the Strombolian explosive activity has considerably diminished, just as the ash emission which has become weak is discontinuous while remaining confined in the summit area.

Strombolian intracrateric activity continues, unchanged, in the craters of Voragine and NE crater.

Etna - emission of ashes blown by the winds on 29.12.2020 in the early morning -photo Boris behncke

Etna - emission of ashes blown by the winds on 29.12.2020 in the early morning -photo Boris behncke

Etna - trémor au 30.12.2020 / 03h10  - Doc. INGV OE

Etna - trémor au 30.12.2020 / 03h10 - Doc. INGV OE

Regarding the volcanic tremor, no significant variation is reported from the above.

The amplitude remains in the range of average values, even with small fluctuations, and the source is localized in the area of ​​the SE Crater at an altitude of 2800-2900 m above sea level.

Regarding intrasonic activity, it continues to be sustained. It is mainly located in the region of the NE Crater, and subordinate to the SE Crater

The inclination (tiltmeter) and clinometric networks of Etna do not show any significant variation.

 

Source: INGV OE

Sakurajima - 12/29/2020 / 4:18 p.m. - via Twitter

Sakurajima - 12/29/2020 / 4:18 p.m. - via Twitter

Sakurajima - 12/29/2020 / 4:27 p.m. - JMA

Sakurajima - 12/29/2020 / 4:27 p.m. - JMA

An eruption occurred at Sakurajima (Mount Minamidake summit crater) at 4:14 p.m. on the 29th, and smoke entered the clouds 2000m above the crater rim.

Volcanic ash is washed away from the crater in a northeast direction (direction Fukuyama, Kirishima city), and in one hour, a slightly large amount in Kagoshima city (Sakurajima)

There is ashfall and ashfall is expected to reach Miyazaki Prefecture.

 

Source: JMA

December 29, 2020, ~ Explosion ~ Sakurajima Volcano, Japan ~ 16:14 JST

An effusive eruption takes place at La Soufrière de Saint-Vincent in the Caribbean; residents of Saint Vincent and the Grenadines (SVG) have been placed on alert.

Volcanologist Dr Richard Robertson, during a press briefing, said on December 22, the Seismic Research Center at the University of the West Indies (UWI-SRC) in Trinidad was made aware by National Aeronautics and Space Administration (NASA) of a hot spot on La Soufrière.

Since the beginning of November, there has been an increase in the background level of seismic activity recorded at La Soufrière.

The photo taken by the main seismic technician of the Soufrière monitoring unit on December 29, 2020 shows a new dome with steam in the crater following an effusive eruption at the La Soufrière volcano in St Vincent.

Soufrière de St-Vincent - 29.12.2020 - new dome - photo Kemron Alexander /  UWI monitoring unit

Soufrière de St-Vincent - 29.12.2020 - new dome - photo Kemron Alexander / UWI monitoring unit

The UWI-SRC is currently monitoring the situation in collaboration with the local authorities and an update will be provided shortly. The public is advised not to visit the volcano until a new update is provided. The UWI-SRC and the National Emergency Management Organization (NEMO) are the official sources of information on earthquakes and volcanic activity in St Vincent and the Grenadines.

 

Source: UWI Seismic research

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