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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
Karymsky - ash plume and gas at 10 km - Photo taken from Olga Bay territory of Kronotsky bay by A. Eliseeva / Kronotsky Reserve. In the foreground, the Maly Semyachik volcano - via KVERT - one click to enlarge

Karymsky - ash plume and gas at 10 km - Photo taken from Olga Bay territory of Kronotsky bay by A. Eliseeva / Kronotsky Reserve. In the foreground, the Maly Semyachik volcano - via KVERT - one click to enlarge

Karymsky - volcanic ash advisory at 04.20.2022 / 0000Z - Doc. VAAC Tokyo

Karymsky - volcanic ash advisory at 04.20.2022 / 0000Z - Doc. VAAC Tokyo

Moderate explosive activity of the Karymsky volcano continues. Satellite data from KVERT showed that on April 19 at 9:30 p.m., explosions sent ash up to 6 km above sea level, with the ash plume extending south-southwest from the volcano. The aviation code is orange.

The volcano's explosive activity continues, with explosions sending ash up to 10 km above sea level, with the ash plume extending northeast from the volcano. On April 19 at 10 p.m., the aviation code turns red.

A thermal anomaly of VRP 6,617 MW around 11:30 p.m. was reported by Mirova.

KVERT satellite data showed that moderate ash emission up to 5 km a.s.l. from the Karymsky volcano continues. The ash cloud with a size of 505x130 km at an altitude of up to 8.7 km above sea level continues to stretch and move northeast (about 302 km from the volcano), and towards the south (about 260 km from the volcano) and the southeast (about 220 km from the volcano) of the volcano. The aviation code was lowered to orange on April 20 at 03:44.

Moderate explosive activity of the volcano continues. Ash explosions up to 12 km a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.

 

Sources: KVERT, VAAC Tokyo, Mirova.

Sabancaya - bulletin from 11.04 to 17.04.2022 - Doc. IGPeru

Sabancaya - bulletin from 11.04 to 17.04.2022 - Doc. IGPeru

During the week of April 11 to 17, the eruptive activity of Sabancaya remained at moderate levels, with an average of 46 daily volcanic explosions, accompanied by plumes of ash and gas reaching 3,400 meters above the summit.

The I.G.P. detected over this period 226 earthquakes associated with the circulation of magmatic fluids, and a few VT earthquakes, linked to rock fracturing.

Eight thermal anomalies were identified, with a max. of 58 MW, associated with the presence of a lava body on the surface of the crater. No significant structural deformation.

The volcanic alert remains in Naranja, associated with a non-accessible zone of 12 km. radius around the crater

 

Source: I.G.Peru uploaded on 19.04.2022

Turrialba - active degassing on 19.04.2022 / 06:18 - Ovsicori webcam - one click to enlarge

Turrialba - active degassing on 19.04.2022 / 06:18 - Ovsicori webcam - one click to enlarge

No eruption is recorded at Turrialba.

Seismicity remains dominated by frequent low-frequency, low-amplitude LP-type volcanic earthquakes.

The concentration of SO2 gas detected in the vicinity of the western crater remains within normal variation values, around 0.5 and 3.4 parts per million, and the ratios of CO2 / SO2 and H2S / SO2 remain stable, around 25 and between 0.13-0.3, respectively.

The volcanic edifice experiences a slight extension according to the relative movements detected by the GPS network. Today April 17, 2022 at 10:48 am A volcano-tectonic earthquake of magnitude 2.2 occurred with an epicenter about 0.5 km north of the west crater of the Turrialba volcano. The earthquake was reported and felt by some Turrialba Volcano National Park officials who were near the summit. No change in the behavior of the volcano is observed as a result of this earthquake.

 

Active degassing still marks the crater on April 19.

 

Source: Ovsicori

Turrialba - west crater - photo Ian Godfrey 04.04.2022 / via Ovsicori - one click to enlarge

Turrialba - west crater - photo Ian Godfrey 04.04.2022 / via Ovsicori - one click to enlarge

At Poas, from the afternoon of April 11 to the present day, seismographs record a weak signal of low amplitude tremors with frequencies between 1 and 3.5 Hz. The concentrations of SO2 show fluctuations in the levels of normal detection, but usually very low values.
The H2S/SO2 ratio also records very low values ​​around 0.1. The volcanic edifice experiences a slight extension depending on the relative movement detected by the GPS network. Subaerial vents in the eastern crater and submarine vents in the hyperacid lake continue to outgas low temperature water vapor. Active convection cells are still observed in the hyperacidic lake and it retains its milky gray color since the occurrence of the April 6 hydrothermal explosion.

On April 17, the GRIMM 180 laser dust analyzer and the ThermoScientific 43i SO2 gas analyzer at the OVSICORI-UNA volcanic gas and aerosol monitoring station at EMVA-Coronado, recorded an unusual trend of a slight increase in the concentration of fine aerosols and SO2 in the ambient air of Coronado with a low speed wind coming from the northwest, that is to say from the direction of the Poás volcano, which is the potential source of these aerosols. From 9.35 a.m. Until the publication of this report, ie for 4 continuous hours, PM10 concentrations of between 8.5 and 17.6 ug/m³ were recorded. The typical daily average is around 6.7 ug/m³ of PM10. Some people have reported respiratory system discomfort such as sneezing, coughing, and difficulty breathing.

 

Source: Ovsicori-UNA

Poas – 19.04.2022 - Active convection cells are still observed in the hyperacidic lake and it retains its milky gray color since the occurrence of the hydrothermal explosion on April 6.- Ovsicori webcam - one click to enlarge

Poas – 19.04.2022 - Active convection cells are still observed in the hyperacidic lake and it retains its milky gray color since the occurrence of the hydrothermal explosion on April 6.- Ovsicori webcam - one click to enlarge

Post-eruption activity Cumbre Vieja, La Palma
During the last 7 days, since the last communication (April 12 at 9:00 UTC), 11 earthquakes have been located on the island of La Palma. The magnitudes are between 0.5 and 2.0 mbLg. None of the earthquakes of this period were felt by the population. The location of hypocenters continues below the central area of ​​Cumbre Vieja, in the same areas as in previous weeks, at depths between 0 and 20 km. No earthquake was located at greater depth.

The network of permanent GNSS stations on the island does not show significant deformations that could be associated with volcanic activity.

IGN is continuing its presence on the island where the CAVE (Eruption Care and Surveillance Center) has been set up, which maintains, densifies and improves the surveillance network.

 

Source: IGN

La Palma - Cumbre Vieja - earthquakes of the last 7 days on 19.04.2022 - Doc. IGN

La Palma - Cumbre Vieja - earthquakes of the last 7 days on 19.04.2022 - Doc. IGN

Cumbre Vieja - taking geochemical parameters - photo IGN 18.04.2022

Cumbre Vieja - taking geochemical parameters - photo IGN 18.04.2022

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