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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
Etna SEC - Strombolian activity in the evening of 21.10.2021 - photo Boris Behncke / INGV

Etna SEC - Strombolian activity in the evening of 21.10.2021 - photo Boris Behncke / INGV

The National Institute of Geophysics and Volcanology, Etneo Observatory, announces that from approximately 5:20 pm UT on October 21, 2021, a gradual increase in explosive activity is observed at the level of the southeast crater of Etna.

It generates the projection of scraps of incandescent material beyond the edge of the crater. Currently, the current activity produces discontinuous and soft ash emissions which disperse in the direction of the eastern quadrants of the volcanic building.
The average amplitude of the volcanic tremor is currently at average levels with a slight tendency to increase. The location of the centroid of the sources of the volcanic tremor remains located in the area between Voragine and Bocca Nuova at an altitude between 2900 and 3000 m above sea level. Infrasound activity remains at low levels.
At present, soil deformation monitoring networks do not show significant variations.

 

Sources: INGV OE AND Boris Behncke

Yasur - ash and gas emission on the rise - VGO webcam 10/22/2021 3 p.m.

Yasur - ash and gas emission on the rise - VGO webcam 10/22/2021 3 p.m.

The activity of the Yasur volcano in Vanuatu continues in the state level of major unrest. The volcanic alert level remains at level 2.

New ground observations suggest that Yasur's volcanic activity emits plumes of volcanic gas and / or ash and few earthquakes were reported on September 28, 2021. With this current activity, with the presence of volcanic gases and / or volcanic ash around the summit crater, the danger zone remains at 600 meters around the volcanic cone. The danger zone for the safety of persons is limited to the danger zone A.
Analysis of the latest Yasur seismic data from the volcanoes monitoring system confirms that the activity of the Yasur volcano remains in a state of major unrest. The activity consists of continuous explosions with gas plumes and / or volcanic ash. Some explosions remain intensified and volcanic projectiles or bombs may fall in and / or around the summit crater.

The Yasur Volcanic Alert Level (VAL) has been at level 2 since October 18, 2016. Current observations are consistent with the activity of volcanic alert level 2. Level 2 indicates “major level of unrest; The danger zone remains at 600 m around the volcanic cone ”. With this current volcanic activity, it's a helpful reminder that eruptions can occur with little to no warning.


Source: VGO

Matupit island and Tarvurvur - photo archives Chris Bray / Australian geographic

Matupit island and Tarvurvur - photo archives Chris Bray / Australian geographic

Map of the Rabaul caldera - Doc. USGS / L. Topinka

Map of the Rabaul caldera - Doc. USGS / L. Topinka

On October 6, RVO raised the alert level for Rabaul to Level 1 (the lowest level on a four-level scale) due to ongoing deformation and recent increases in seismicity.

During the month of September, the seismic network detected a total of 22 high-frequency volcano-tectonic earthquakes, more than the 12 recorded in August. The earthquakes were spread across the regions of Beehives, Vulcan, Greet Harbor and Namanula.

Deformation data from a GPS station located in the S part of Matupit Island showed a continuous uplift trend, with 39 mm / month in August and 35-39 mm / month in September. Diffuse white fumarolic plumes rose from the bottom of the crater and the interior walls.

 

Source: Rabaul Volcano Observatory (RVO / PNG / via GVP

La Palma / Cumbre Vieja - Heavy ash emissions leaving a lifeless gray landscape - 21.0.2021 / 10:27 - PTZ IP webcam

La Palma / Cumbre Vieja - Heavy ash emissions leaving a lifeless gray landscape - 21.0.2021 / 10:27 - PTZ IP webcam

Since the last press release, 124 earthquakes have been located in the area affected by the volcanic reactivation of Cumbre Vieja on La Palma.

Twelve of these earthquakes were felt by the population, the maximum intensity being in the epicentral zone IV (EMS98), with the earthquakes which occurred at 13:43 UTC on the 20th, with a magnitude of 3.6 mbLg and at 2:14 today, with a magnitude of 4.3 mbLg and depths of 11 and 37 km respectively. The earthquake of 2:14 today (4.3 mbLg) is the largest earthquake of the period considered.

A single earthquake was located at a depth of about 30 km, the rest of the hypocenters of the period are located at a shallower depth, about 12 km.

The volcanic tremor signal maintains a high average amplitude, with few intensifying pulses.
The height of the scattering cloud measured at 08:00 UTC is estimated at 4000 m.
The island's network of permanent GNSS stations still shows no clear tendency to warp from stations closest to eruptive centers, while at more distant stations a slight deflation is maintained, possibly related to deep seismicity. .

As of October 21, 2021 / 12:06 UTC, Copernicus reports an extension of lava flows over 886.6 ha., 6,800 ha. Covered by ashes and 2,122 buildings destroyed.
 

Source: IGNes, InVolcan, Copernicus

La Palma / Cumbre Vieja  - 21.10.2021 / 14h30 - nouvelle webcam IGN / Tazacorte

La Palma / Cumbre Vieja - 21.10.2021 / 14h30 - nouvelle webcam IGN / Tazacorte

La Palma / Cumbre Vieja - Castings at 21.10.2021 / 12:06 - Doc.Copernicus EMSR

La Palma / Cumbre Vieja - Castings at 21.10.2021 / 12:06 - Doc.Copernicus EMSR

Cumbre Vieja - 20.10.2021 Activity - Vidéo IGME-CSIC

Cumbre Vieja - Overflow of lava from the main canal - 20.10.2021 / 19h30 - Vidéo IGME-CSIC

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