Saturday, March 2, 2013

GLOBAL VOLCANISM: The Volcano Discovery Report For March 01, 2013 - Updates On Stromboli, Etna, Kliuchevskoi, Iceland's Tjörnes Fracture Zone, Gorely, Kizimen, Karymsky, Shiveluch, Tolbachik, Bezymianny, Hakone, Sakurajima, Popocatépetl, And Fuego!

March 02, 2013 - WORLDWIDE VOLCANOES - The following constitutes the new activity, unrest and ongoing report from the Volcano Discovery Group.

Etna (Sicily, Italy): Seismic and eruptive activity have gradually declined, after the lava flows from yesterday's paroxysm continued to advance for a while and strombolian activity took place from Voragine during the night. The Radiostudio 7 Belvedere Webcam has barely escaped destruction from the flows, but unless moved, it is probably only a matter of time until it suffers the same fate as the INGV seismic station.

WATCH: In the morning of 28 February 2013, Etna's new South-East Cone had its 6th paroxysm of a sequence which had started nine days earlier. Marco Fulle of the Volcano Discovery crew filmed this one from a distance of only one km towards the south. The strength of the eruption sent a multiple lava fountain about 1km above the erupting fissure, while a convective column rose many km in the sky. All videos were filmed with a Nikon D7000 camera. The full-HD movies were compressed to MP4 files.

As night falls, glow and some ejections from ongoing strombolian activity inside Voragine crater become visible.

Webcam image of Etna with glow from Voragine crater.
Tjörnes Fracture Zone (North of Iceland): An earthquake swarm is in progress east of Grímsey Island. So far, the largest quakes are below magnitude 3.

Recent earthquakes in Iceland (note the red dots of the swam in the TFZ north off Iceland).
Gorely (Southern Kamchatka): Moderate seismic activity, and moderate to strong degassing activity of the volcano were observed last week. Satellite data showed a thermal anomaly over the volcano. (KVERT weekly update)

Stromboli (Eolian Islands, Italy): After its brief surge in activity 2 days ago, the volcano has calmed down and not produced new overflows.

Kliuchevskoi (Kamchatka): Weak seismic activity related to possibly weak strombolian activity in the summit crater of the volcano continues.

Kizimen (Kamchatka): Moderate seismic activity of the volcano continues. Video and satellite data showed a growth of an extrusion at the volcano summit continues.

Incandescence of the volcano summit, hot avalanches on the western and eastern volcanic flanks and strong gas-steam activity accompany this process... [read more]

Karymsky (Kamchatka): Moderate seismic activity of the volcano continues. Satellite data showed a thermal anomaly over the volcano on February 21 and 25-28.

Shiveluch (Kamchatka): A viscous lava flow continues to effuse on the eastern flank of the lava dome. Strong and moderate fumarolic activity and incandescence of the dome summit and hot avalanches accompanies this process. (KVERT weekly update).

Tolbachik (Kamchatka): The eruption continues with little changes: very fluid lava flows are erupted from the Southern fissure at Tolbachinsky Dol and are moving to the southern, eastern and western slopes of Tolbachinsky Dol.
Cinder cones continue to grow on the Southern fissure. Gas-steam plumes with ash rose up to 11,500 ft (3.5 km) a.s.l. and extended to different directions of Tolbachinsky Dol last week. (KVERT weekly update)

Bezymianny (Central Kamchatka Depression): A viscous lava flow continues to be active on the lava dome flank. Weak and moderate gas-steam activity accompany this process.

Sakurajima (Kyushu, Japan): The volcano had a series of stronger vulcanian explosions over the past days, with ash plumes rising up to 3.7-4.3 km altitude.

WATCH: Strong eruption with lightning in the ash column on the evening of February 27th at Sakurajima.

Popocatépetl (Central Mexico)
: While the rate of gas-steam(-ash) emissions remains low, the intensity of some of them and overall degassing activity have increased. A strong SO2 plume and some emission tremor are visible on current satellite and seismic data.

SO2 plume from Popocatépetl (NOAA).

Fuego (Guatemala): A new lava flow has appeared from the summit crater of Fuego volcano and is traveling towards Trinidad canyon and about 300 m long. Weak explosions occur from time to time as well, with plumes rising only a few 100 meters. The current seismic signal shows an increase of activity over the past hours.
Current seismic signal from Fuego (FG3 station, INSIVUMEH).

Hakone volcano (Honshu, Japan): increased seismicity and deformation worries scientists about possible new eruptions
The latest bulletin of the Japan Meteorological Agency mentions that an increase in seismicity since January 11 near the intra-caldera dome Komagatake is beginning to worry scientists about a possible new activity.

Photo taken in Sengokuhara, Hakone, Ashigarashimo District, Kanagawa Prefecture, Japan.
This increased seismicity is accompanied by deformation (inflation) detected since the end of 2012. No tremor has been recorded at the moment. The geothermal activity of Hakone is a popular tourist destination and several small towns lie in the immediate vicinity of the volcano, which is itself within 80 km from downtown Tokyo. The alert level is, for the moment, kept at 1. Source: JMA / Activolcans.

- Volcano Discovery.