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SI/USGS Weekly Volcanic Activity Report 31 March-6 April 2010 8 April 2010

Posted by admin in activity reports, Alaska, Batu Tara, Caribbean, Dukono, eruptions, Eyjafjöll, Hawaii, Iceland, Indonesia, Japan, Kamchatka, Karymsky, Kilauea, Kirishima, Kliuchevskoi, Redoubt, Russia, Sakura-jima, Shiveluch, Soufrière Hills, Suwanose-jima, United States, Weekly Volcanic Activity Reports.
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Some highlights from the last week of volcanic activity reported by the Global Volcanism Program:

  • Eyjafjöll: a new fissure opens, lava fountain activity continues
  • Kilauea: highest daily level of sulphur dioxide emissions so far in 2010 recorded on 31 March – 1,400 tonnes/day
  • Kirishima: alert level raised following eruption at Shinmoe-dake
  • Redoubt: a brief period of repetitive earthquakes in the summit region causes the alert level to be raised

SI/USGS Weekly Volcanic Activity Report 31 March - 6 April 2010

Click on the map for a larger version (1280 x 898 pixels).

The Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report for 31 March-6 April 2010 is now available on the Global Volcanism Program website. The following is a summary and not a substitute for the full report.

New activity/unrest: Eyjafjöll (Iceland), Karymsky (Russia), Kirishima (Japan), Redoubt (Alaska, USA).

Ongoing activity: Batu Tara (Indonesia), Dukono (Indonesia), Kilauea (USA), Kliuchevskoi (Russia), Sakura-jima (Japan), Shiveluch (Russia), Soufrière Hills (Montserrat), Suwanose-jima (Japan)

Note: a.s.l. = ‘above sea level’.

Eyjafjöll (Iceland). A new fissure opened NE of the first fissure at around 19:00 GMT on 31 March. Its appearance was not preceded by detectable seismicity. News articles reported that the fissure was about 300 m long and about 200 m from the first fissure. Lava fountains remained active from both fissures. Lava mostly accumulated near the new vent but some lava flows had entered the Hruná and Hvanná gullies.

Karymsky (Russia). During 26 March-2 April seismic activity was above background levels, possibly indicating ash plumes rising to 4.1 km a.s.l. Satellite imagery revealed an intense daily thermal anomaly from the volcano, and ash plumes that drifted generally E about 250 km during 28-29 and 31 March. The Aviation Colour Code level was raised to Orange.

Kirishima (Japan). An eruption from Shinmoe-dake in the Kirishima volcano group on 30 March caused the Alert Level to be raised from 1 to 2 (on a scale of 1-5). Ash blanketed the ground to the W of the crater.

Redoubt (Alaska, USA). A series of small repetitive earthquakes in the vicinity of the summit was detected on 5 April. The Volcano Alert Level was raised to Advisory and the Aviation Colour Code was raised to Yellow. On the next day the rate of earthquakes decreased markedly.

ONGOING ACTIVITY

Batu Tara (Indonesia). On 5 April an ash plume rose to 2.1 km a.s.l. and drifted more than 35 km N.

Dukono (Indonesia). On 2 April an ash plume was seen on satellite imagery drifting 55 km S at 2.4 km a.s.l.

Kilauea (Hawaii, USA). During 31 March-6 April incandescence was reported from a 60-m-wide active lava surface about 200 m below a vent in the floor of Halema’uma’u crater. The lava surface circulated and both rose and drained through a pit in the cavity floor; a few times the level fluctuated between 235 and 260 m below the surface. Plumes from the vent drifted mainly SW, dropping small amounts of ash downwind. The sulphur dioxide emission rate at the summit on 31 March was 1,400 tonnes/day, the highest recorded in 2010. The rate on 1 and 2 April was 1,000 and 650 tonnes/day respectively. Lava from beneath the Thanksgiving Eve Breakout (TEB) and rootless shield complex flowed SE through the upper portion of a lava tube system and broke out onto the surface. Lava flows advanced E, and then SE down Pulama pali.

Kliuchesvkoi (Russia). During 26 March-2 April seismic activity was above background levels and gas-and-steam plumes containing small amounts of ash were sometimes seen rising to 5.3 km a.s.l. Strombolian activity ejected material 300 m above the crater and lava continued to flow down the flanks. Satellite imagery revealed a large daily thermal anomaly from the volcano and gas-and-steam plumes that drifted about 70 km E on 30 March. The Aviation Colour Code level remained at Orange.

Sakura-jima (Japan). During 31 March-6 April explosions sometimes produced plumes identified on satellite imagery. Those plumes, along with ash plumes occasionally seen by pilots, rose to 1.5-3 km a.s.l. and drifted SW, SE, E, and NE.

Shiveluch (Russia). During 26 March-2 April seismic activity was above background levels, possibly indicating ash plumes rising to 4.7 km a.s.l. Hot avalanches from the lava dome were seen at night. Satellite imagery revealed a large daily thermal anomaly from the lava dome and ash plumes that drifted about 40 km SE on 29 March. On 5 April an ash plume rose to 3 km a.s.l. and drifted SE. The Aviation Colour Code level remained at Orange.

Soufrière Hills (Montserrat). During 26 March-2 April activity from the lava dome was at a low level. Rockfalls and pyroclastic flows occurred sporadically on the W and S flanks. The Hazard Level remained at 3.

Suwanose-jima (Japan). An explosion was reported on 2 April, but details of possible resulting plumes were not reported.

ACKNOWLEDGEMENTS AND DISCLAIMER

The foregoing is a summary of the Smithsonian Institution/United States Geological Survey Weekly Volcanic Activity Report covering 31 March-6 April 2010. It is provided for information only, and is based on but not a substitute for the full report, which comes with its own criteria and disclaimers. The map base is derived from the Smithsonian Institution/USGS/US Naval Research Laboratory This Dynamic Planet website.

For all our coverage of the SI/USGS Weekly Volcanic Activity Reports: Weekly Volcanic Activity Reports « The Volcanism Blog.

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