This July 31, 2021 from around 5.15 p.m. UTC, Strombolian activity is observed at the level of the south-eastern crater of Etna, following a rapid increase in the tremor from 5 p.m. UTC.
The activity is currently confined to the crater and generates discontinuous and light ash emissions which are dispersed in the summit area.
From 17:50 UTC, the increase in explosive activity at the level of the southeast crater is signaled by the INGV, and produces an ash cloud which reaches 5 km above sea level and disperses in the SE direction.
Around 19:15 UTC a lava flow is observed which is propagating in a southwest direction.
The observatory signals at 11:22 p.m. (9:22 p.m. UTC) the gradual passage of Strombolian activity towards the shape of a lava fountain at the level of the southeast crater. Based on the forecast model, the eruptive cloud produced by the current activity disperses in the eastern sector and marginally in that to the south of the volcano; the lava flow produced by the ongoing activity at the Southeast Crater continues to feed and propagate in the SW direction, when the lava front has reached an altitude of about 2,800 m above the sea level.
The amplitude of the volcanic tremor is on high values with an increasing trend.
The last location of the tremor, at 20:45 UTC, is near the southeast crater at a depth of about 3,000 m above sea level.
The lava fountain in the southeast crater ceased at around 11:30 p.m. UTC; a weak strombolian activity continues with a modest emission of ash. The lava flow which extends in the SW direction continues to be fed, another lava flow is also observed which extends along the northern flank of the Southeast crater.
Source: INGV OE
The seismic activity of the Semisopochnoi has increased in recent days, particularly marked during the last 8 hours. Increased activity was also detected on local infrasound stations, suggesting possible low level emissions (below 10,000 feet above sea level).
Due to this increase in activity, AVO is increasing the Aviation Color Code to ORANGE and the Alert Level to WATCH on July 31 at 10:19 AKDT.
When they do occur, small eruptions producing minor ash deposits near the active north crater of Mount Cerberus and ash clouds within 10,000 feet above sea level are typical of activity at Semisopochnoi.
Karymsky - photo Press Service of the Main Directorate of the Russian Emergency Ministry for the Territory of Kamchatka / 01.08.2021
This August 1, 201, the Karymsky volcano emitted an ash plume at a height of 2,000 m.asl.
According to the Kamchatka Volcanic Eruption Response Group and the Kamchatka branch of the geophysical service of the Russian Academy of Sciences, to which the rescue department refers, the ash plume was transported in a southeast direction at a distance of 55 kilometers towards Kronotsky Bay.
The activity continues, which could affect aviation, which justifies the maintenance of Code Orange.
Sources: KVERT & https://rg.ru/