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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

The National Institute of Geophysics and Volcanology, Etneo Observatory, announces that as of 12:47 UTC on May 19, 2021, an increase in explosive activity was observed from the area of ​​the North Crater of Stromboli which at 12:51 a.m. produced a pyroclastic flow which reached the coast, then developed over the sea for 1 km and produced an ash cloud which reached an estimated height of about 1.5 to 2 km above sea level .

From 12:47 UTC, an increase in the seismic trace was recorded which may be associated with the dynamics of the pyroclastic flow along the Sciara del Fuoco.

 Stromboli - 19.05.2021 - Doc. LGS

Stromboli - 19.05.2021 - Doc. LGS

Stromboli - 19.05.2021 - Drumplot stazione seismica ROC from 11 a.m. at 17 o'clock. UTC - Doc. LGS

Stromboli - 19.05.2021 - Drumplot stazione seismica ROC from 11 a.m. at 17 o'clock. UTC - Doc. LGS

Stromboli - pyroclastic flow of 19.05.2021 - via Sabrina Mugnos

Stromboli - pyroclastic flow of 19.05.2021 - via Sabrina Mugnos

Stromboli 19.05.2021 / from 2:51 pm local - FOBOS PLANET

Further pyroclastic flows of lesser intensity occurred from 1:02 p.m. UT, producing modest clouds of ash and warm coarse matter reaching the shore. The phenomenon is still ongoing.

A series of events (at 12:51, 13:04, 13:09, 13:13 UTC, etc.) are clearly visible at the Ginostra ISTR seismic station and at STR4 station.

 

Following the overflight carried out by INGV personnel with the fire brigade helicopter, it was observed that the pyroclastic flow, described above, came from the collapse of the side of the north crater (CN). The latter produced an overflow of lava which flows along the Sciara del Fuoco; the lava front has reached the coast.

The MODIS satellite image acquired at 20:40 h 20:40 UTC today detected a high level thermal anomaly, ie VRP 899 MW. This value is compatible with a lava flow activity fed by effusive rates of 2-3 m³ / sec.
The explosive activity continues.

 

Sources: INGV OE, L.G.S. (Laboratorio Geofisica Sperimentale),& Mirova

Stromboli - thermal anomalies of 20.05.2021 / 00h55 - Doc. Mirova _MODIS_Latest10NTI

Stromboli - thermal anomalies of 20.05.2021 / 00h55 - Doc. Mirova _MODIS_Latest10NTI

Stromboli - 19.05.2021 - thermal camera of Punta dei Corvi - INGV OE

Stromboli - thermal camera activity on 20.05.2021 / 05.45 a.m. - INGV OE

Stromboli - thermal camera activity on 20.05.2021 / 05.45 a.m. - INGV OE

In Fagradalsfjall, for the past five weeks, a crater has dominated the activity and all the lava is coming out. This period can now be divided into two parts.

There were first three weeks when the flow was 5 to 8 m³ / s and slightly increasing. During the past two weeks, the flow has been 11 to 13 m³ / s. Despite this increase, the lava flow is relatively small compared to many other eruptions.

Fagradalsfjall event # 5 - activity on 19.05.2021, at 6:40 am and 7:40 am respectively - webcam_langihryggur N
Fagradalsfjall event # 5 - activity on 19.05.2021, at 6:40 am and 7:40 am respectively - webcam_langihryggur N

Fagradalsfjall event # 5 - activity on 19.05.2021, at 6:40 am and 7:40 am respectively - webcam_langihryggur N

By May 18, the area of ​​the flow field had increased to 2.06 square kilometers, the total erupting volume was 38 million cubic meters.

Authorities directed the construction of earthen barriers to prevent lava from flowing into the Nátthaga Valley and possibly overtaking Highway 427 (Suðurstrandarvegur) to the south, protecting the road and buried fiber optic cables.

The aviation color code remained at Orange due to the lack of ash and tephra emissions.

Authorities have warned of increasing risks from gas emissions.

 

Sources: IMO, RUV, mbls, Icelandic Univ.

Fagradalsfjall - parameters of the eruption as of 05/18/2021 / 5:40 p.m. - Univ. Iceland & al.

Fagradalsfjall - parameters of the eruption as of 05/18/2021 / 5:40 p.m. - Univ. Iceland & al.

On May 17, the Ecuadorian Ministry of the Environment reported the collapse of Darwin's Arch, the pretty natural bridge located less than a kilometer from the main island of Darwin, the northernmost island in the world. he volcanic archipelago of the Galapagos. This event would be a consequence of a multifactorial natural erosion.

The rock structure, which is nearly 43 meters high, 70 meters long and 23 meters wide, is not accessible by land.

Sources: Ecuadorian Ministry of Environment and local media

Galapagos Archipelago - Darwin's Arch on 05.16.2021 - photo CBS News

Galapagos Archipelago - Darwin's Arch on 05.16.2021 - photo CBS News

Galapagos Archipelago - Darwin's Arch on 05.17.2021 after its summit collapsed - photo Aggressor Adventures Facebook page

Galapagos Archipelago - Darwin's Arch on 05.17.2021 after its summit collapsed - photo Aggressor Adventures Facebook page

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