Etna volcano updates and eruption news:
Etna volcano update: Explosion and ash emission from North-East crater
Wednesday Feb 24, 2016 10:16 AM | DOOR: T
Eruption of Etna's NE crater yesterday morning (INGV Catania)
An unusual eruptive episode occurred yesterday morning from the volcano's NE crater (the least active of the summit vents over the past few decades). Incandescent bombs were ejected above the rim of the crater and an ash plume rose several hundred meters.
Thermal image of the eruption showing incandescent material ejected from NE crater
Whether this is the beginning of a more significant eruptive phase, after a period of relative calm since the violent paroxysms of Voragine summit crater in early Dec 2015 remains to be seen.
INGV published the following report:
"During the month of January 2016, Etna's eruptive activity has maintained rather low levels. Early that month, a few weak ash emissions occurred from the 25 November 2015 vent located high on the eastern flank of the New Southeast Crater (NSEC) cone; similar phenomena were repeated during the last week of January and once more on the morning of 6 February. During the same time interval, degassing from the Northeast Crater (NEC) were sometimes accompanied by the emission of minor traces of ash.
A field survey was carried out in Etna's summit area by INGV-Osservatorio Etneo (INGV-OE) staff on 19 February. During the visit, no ash emissions occurred from the summit craters, but the NEC was the site of intense degassing from its open conduit; due to strong wind it was not possible to hear if there was any acoustic activity coming from the crater, which typically produces loud bangs and rumblings. At the other summit craters, degassing was limited to extensive fumarolic areas along the crater rims. The eruptive products of December 2015, which fill the single huge depression constituted by the Voragine and Bocca Nuova, were covered with snow except in the areas where vapors were emitted from fissures formed by compaction of the deposit.
At 03:22 UTC (=local time -1) on 23 February 2016, the video and thermal cameras of the INGV-OE recorded an explosive event at the NEC, which ejected incandescent pyroclastics to several tens of meters above the crater rim (see image at top left, recorded by the high-definition visual camera at Monte Cagliato, on the east flank of Etna - click on image for larger version) and produced a dark ash plume that was blown northeastward by strong wind. The images at center left (click on image for larger version) were recorded by the high-sensitivity camera on the Montagnola (EMOH, on the upper south flank of Etna) and also show a few lightning flashes in the ash cloud.
The images recorded by the thermal surveillance camera at Monte Cagliato (EMCT, see images at bottom left - click on image for larger version) show a conspicuous anomaly generated by the explosion, which was followed by minor ash emissions that gradually diminished; as of the late morning of 23 February, intermittent and weak ash emissions are continuing from the NEC.
" (INGV Catania)
Saturday, Dec 12, 2015
The NE crater started again to produce puffs of ash, generating small plumes drifting southwest. [meer...]
Friday, Dec 11, 2015
The volcano is at the moment calm. During Wednesday, the initially strong ash-venting activity from the NE crater decreased and stopped yesterday. ... [meer...]
Wednesday, Dec 09, 2015
Ash emissions from NE crater continue, but seem to be decreasing in intensity. ... [meer...]
Wednesday, Dec 09, 2015
Another of the summit vents seems to be becoming protagonist in the current eruptive phase: the NE crater has been producing near-continous small to moderate ash emissions throughout the night and the morning. Incandescence was occasionally seen at the base of the plumes as well, suggesting strombolian activity. ... [meer...]
Tuesday, Dec 08, 2015
Over the morning, surface activity at Etna's New Southeast Crater strongly decreased, and the lava flow seems no longer be active now. Tremor has dropped as well, but ash emissions and occasional explosions continue from several of the summit craters, including the Northeast. ... [meer...]