Overblog
Editer l'article Suivre ce blog Administration + Créer mon blog

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

Another violent climax this night of the South-East crater of Etna, the second in less than 36 hours:

A new lava overflow from the Southeast crater is observed, which began just before 10:30 p.m. UTC on February 17. The lava flow descends the east side of the cone, towards the Valle del Bove. The tremor increases and is raised.

Etna SEC - 02.17.2021 / 11.55pm / - new lava overflow - LAVE webcam

Etna SEC - 02.17.2021 / 11.55pm / - new lava overflow - LAVE webcam

At 01:13 local time on February 18, a lava fountain animates the south-eastern crater. The lava flow reported in the previous press release has currently traveled about 1 km, with a front at an altitude of about 2,700 m. An eruptive column heads south-east.

Around 1:25 am local, a second flow of lava flows on the north side of the south-eastern crater, e, direction of the Valle del Leone.

The average amplitude of the volcanic tremor shows high values ​​with an increasing trend.

The source of the tremor is located under the SE crater, in the depth interval 2800-2900m., And the infrasound activity seems to be high.

Etna SEC - second lava flow on 02/18/2021 / 12:58 a.m. - LAVE webcam

Etna SEC - second lava flow on 02/18/2021 / 12:58 a.m. - LAVE webcam

Etna seen from Milo - 02/18/2021 / shortly after 001h - photo Boris Behncke

Etna seen from Milo - 02/18/2021 / shortly after 001h - photo Boris Behncke

 Etna - anomalie thermique extrême au 18.02.2021 / 01h15 - Doc. Mirova_MODIS_Latest10NTI

Etna - anomalie thermique extrême au 18.02.2021 / 01h15 - Doc. Mirova_MODIS_Latest10NTI

The lava fountain activity ended at approximately 00:55 UTC. The lava flows progress slowly but are no longer fed. The main lava flow extends over the bottom of the Valle del Bove at an altitude slightly below 2000 m, after a course of 3.5 to 4 km. The small flow towards the Valle del Leone is about 1 km. long, with a lava front at an altitude of about 2900 m.

Another overflow occurred on the south side of the southeast crater, feeding a small flow to the southwest.

The eruptive cloud was blown towards the south-east by the wind, causing fallout of ash and lapilli on this sector of the volcano.

 

Source: INGV OE

Etna - variations of the tremor at 02/18/2021 / 03:10 am - Doc. INGV OE

Etna - variations of the tremor at 02/18/2021 / 03:10 am - Doc. INGV OE

Etna - the flows always hot on 02/18/2021 at 07:30 - webcam Emot0143 INGV

Etna - the flows always hot on 02/18/2021 at 07:30 - webcam Emot0143 INGV

At Raung, ash emissions have resumed; the main plume, gray and black, is observed about 300-1000 meters from the peak.

At the seismic level, the PVMBG provides information:

- 1 distant tectonic earthquake with an amplitude of 7 mm, S-P 31 seconds and the duration of the earthquake was 96 seconds.

- 4 episodes of continuous tremor with an amplitude of 1-16 mm, dominating 1 mm.

The activity level remains at 2.

The public and visitors / tourists should not be active within a radius of 2 km from the center of the peak crater eruption.

 

Source: PVMBG

Raung - ash show on 02.17.2021 / 4:45 p.m. - PVMBG webcam

Raung - ash show on 02.17.2021 / 4:45 p.m. - PVMBG webcam

Mount Sinabung erupted on Wednesday February 17, 2021 at 7:10 p.m. WIB with the observed height of the ash plume at ± 1000 m above the summit (± 3460 m above sea level). The ash column is observed to be gray and thick, dispersing to the south and west.

This eruption was recorded on a seismograph with a maximum amplitude of 32 mm and a duration of 110 seconds.

 

Source: PVMBG

Sinabung - 02.17.2021 / 7:12 p.m. - monitor capture / PVMBG

Sinabung - 02.17.2021 / 7:12 p.m. - monitor capture / PVMBG

In Kilauea, lava activity remains confined to Halema'uma'u Crater, with lava erupting from a vent on the northwest side of the crater. As of the morning of February 16, the active western half of the lava lake was approximately 216.5 m deep. The small decrease in depth since yesterday coincides with the current deflation.

During the last day, lava effusion continued at the western fissure, with the lava rapidly developing a thin crust and flowing eastward. A few oozing lava flows were noted along the northern and eastern margins of the otherwise stagnant eastern part of the lake.

The position of the main island has not changed; as measured on February 12, the southern end of the island was 9 m. above the surface of the lava lake, with the highest point at 21 m. above the surface. All the other islands remain stationary, frozen in the stagnant eastern part of the lava lake.

SO2 emission rates remain high. The most recent measurements of sulfur dioxide emission rates from February 12 are around 1,100 t / d, which is lower than the pre-2018 lava lake emission rates (around 5,000 t / d). Summit tiltmeters show that slight deflation continues this morning. Seismicity remains high but stable, with high earthquakes and a few minor earthquakes.

 

Current volcanic alert level: WATCH

Current Aviation Color Code: ORANGE

 

Source: HVO-USGS

Kilauea - Halema'uma'u crater - helicopter flight on the morning of Tuesday February 16 - The cone, in degassing, does not show spattering, but the entry of lava near the base of the cone is evidence of an effusion continuous in the lava lake. - USGS photo taken by Mr. Zoeller.

Kilauea - Halema'uma'u crater - helicopter flight on the morning of Tuesday February 16 - The cone, in degassing, does not show spattering, but the entry of lava near the base of the cone is evidence of an effusion continuous in the lava lake. - USGS photo taken by Mr. Zoeller.

Commenter cet article

Articles récents

Hébergé par Overblog