Etna activity February - March 2013: 8 paroxysms from New SE crater

Etna calm, two recent small earthquake swarms
Update Sun 31 Mar 13:28
Current view of Etna (INGV webcam)
Current view of Etna (INGV webcam)
Depth vs time of recent earthquakes under Etna
Depth vs time of recent earthquakes under Etna
Location of recent earthquakes under Etna
Location of recent earthquakes under Etna
At the surface, Etna remains calm. The current seismic signal and tremor values at the moment don't suggest a new paroxysm from the New SE crater is be expected very soon (although some paroxysms have shown build-up phases of less than a few hours only).
Interestingly, two weak earthquake swarms have occurred two days ago under the flanks of the volcano at opposite sides of the mountain: the first, weaker one, was at depths around 25 km under Monte Spagnolo on the NW flank, the second occurred shortly after at depths around 15 km under the area of Milo on the SE flank. The largest quake was a magnitude 2 event.
(We don't think these small swarms mean much, however.)
Update Sat 30 Mar 10:20
Etna today (the dark patch above the New SE crater is a camera artifact, probably a dirty spot on the lens).
Etna today (the dark patch above the New SE crater is a camera artifact, probably a dirty spot on the lens).
A visit to the summit area and current tremor levels showed the volcano is currently calm. No explosive activity was heard or seen from any of the summit craters.
The area of bomb impacts from the last New SE crater paroxysm on 16 March was impressive - the whole area between Torre del Filosofo, the 2002-03 craters and the area of Cisternazza NE of the Cono del Lago was littered with bombs of various sizes (20-50 cm mostly). The Belvedere was found totally covered with scoria and bombs.


Update Wed 27 Mar 12:29
10 days since the last paroxysm, tremor is still low and doesn't suggest a new eruption is imminent. Bad weather mostly prevented observations during the past days. No glow could be seen last night from any of the summit craters.
Update Tue 19 Mar 09:48
Etna with the fresh black lava flows below the New SE crater this morning seen from Valle del Bove
Etna with the fresh black lava flows below the New SE crater this morning seen from Valle del Bove
Tremor signal (ETFI station, INGV)
Tremor signal (ETFI station, INGV)
Beautiful snow-clad Etna remains restless. While the wait is on for a new SE crater paroxysm (which is likely to occur anywhere between days or few weeks from now), a few pronounced tremor spikes show up on the tremor graph. These probably correspond to strombolian activity from one of the summit craters, likely the Voragine.
Update Sun 17 Mar 10:33
Thermal webcam image at 04:51 showing an ash plume from Etna's Voragine
Thermal webcam image at 04:51 showing an ash plume from Etna's Voragine
Image in next sequency with some hot material visible above Voragine
Image in next sequency with some hot material visible above Voragine
The tremor spike this morning is NOT a second paroxysm...
The tremor spike this morning is NOT a second paroxysm...
A pronounced tremor spike showed up this morning, leading perhaps to the suspicion of a follow-up paroxysm (as Etna has sometimes done in the past). However, looking at webcam images from that time, it seems that an explosion and/or a collapse event (more likely) occurred from Voragine crater and produced a marked tremor spike. An ash plume and minor amounts of hot material can be seen rising a few 100 meters at around 04:51 local time.
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