Klyuchevskoy - Strombolian and Vulcanian activity 18.11.2020 - photo Yu. Demyanchuk IVS FEB RAS KVERT
Klyuchevskoy - hot spot and important plume - image Sentinel-2 L1C bands 12,11,4 from 18.11.2020 - one click to enlarge
Flare-up at Klyuchevskoy on November 18 and 19:
KVERT reports a large ash cloud 65 km by 70 km above the Klyuchevskoy volcanic group, drifting towards the SSE, in its November 18 report.
In the photo of November 18, we notice Strombolian and Vulcanian activity, accompanied by an important ash plume, and on the left at the base of the plume, a glow corresponding to the outpouring in Apakhonchich falls on the southeast flank.
Mirova reports very high thermal anomalies for these 18 and 19 November: 18.11.2020 with max. VRP 1424 MW, and on 19.11.2020 with max VRP 1265 MW.
The explosive-effusive activity continues this November 20. The aviation code remains orange
Sources: KVERT, Mirova & VAAC Tokyo.
Klyuchevskoy - Doc. 11/18/2020 / 12:41 a.m. Sentinel 2 & Modis thremal volcanic activity - MIROVA - - one click to enlarge
During the period from November 9 to 15, 2020, the INGV OE informs at Etna of an intracrateric Strombolian activity with discontinuous ash emissions at the New Southeast Crater (NSEC), of the Strombolian intracrateric activity at the Northeast crater (NEC) and at the Bocca Nuova crater (BN); degassing is observed at the VOR; the deformation does not show significant changes ...
Etna - 15.11.2020 - emission at the BN (left) - at the SEC mouth of the saddle (in the center) and at the SEC mouth east (on the right) - photo INGV OE
Etna - therm activity. volcanic Sentinel-2 & MIROVA at 11.15.2020 / 09.50 a.m. - Doc.Mirova Copernicus - one click to enlarge
The NE crater during the inspection on November 12 showed less intense Strombolian activity than that observed the previous week. In particular, on the bottom of the crater, one vent exhibited almost continuous Strombolian activity, a second vent was affected by discontinuous activity, while a third vent, consisting of a hornitos, was characterized by degassing.
Overall, Strombolian explosions manifested themselves at times as more forceful events, producing launches of coarse material that reached heights of several tens of meters above the crater rim and the products occasionally fell to the exterior, settling on the flanks.
Overall, modest emissions of highly diluted ash were observed from the Bocca Nuova crater during the week.
The Voragine crater was affected by modest degassing of the main cinder cone associated with occasional weak and very dilute ash emissions.
The new south-eastern crater was characterized by intracrateric Strombolian activity of varying frequency and intensity from the mouth of the saddle, accompanied by ejections of coarse pyroclastic material well beyond the edge of the crater, sometimes accompanied by sporadic emissions of ash quickly dispersed by high altitude winds.
Sources: INGV OE
In Karangetang (North Sulawesi), degassing was observed on November 19, between 50 and 150 meters above the active craters. When the top is obscured by fog, the noise of degassing remains audible, the gas pressure being high.
The seismicity of November 19 is characterized by :
- 103 blast / emission earthquakes
- 1 shallow volcanic earthquake
- 4 episodes of harmonic tremor
- 3 episodes of continuous tremor, dominant at 1 mm
- 4 distant tectonic earthquakes.
This November 20, we observe at the main crater a plume of gas / steam about 350 meters high, and at Dua crater a plume between 50 and 300 meters high.
The activity level remains at 3 / siaga. The public and visitors / tourists should not approach, climb or engage in activities within the hazard forecasting area, i.e. 2.5 km radius from the summit of Kawah Dua (Kawah Utara) and Kawah Utama (south) as well as the sectoral expansion area of Dua crater to the northwest- The north is 4 km. And from the main crater up to 3 km to the west.
At Mauna Loa, on Big Island, the deformation and seismicity ratios have not changed significantly over the past week, but remain above baseline levels over the long term.
The Hawaii Observatory recorded 119 low-magnitude earthquakes for the entire volcano, most at a depth of less than 8 km below ground level; 31 were located under the summit and upper flanks.
A slow inflation of the summit is recorded by the GPS measurements, and corresponds to a recharge of the superficial magma chamber.
The gas concentrations and the temperature of the fumaroles at the summit and at the Sulfur cone, in the south-western rift zone, remain stable.
Mauna Loa is not erupting; the volcanic alert level is Advisory and the aviation code Yellow.
Source: latest HVO bulletin