9 January-15 January 2013

On 9 January, AVO reported that unrest at Little Sitkin had decreased over the past several months, reaching background levels. The Volcano Alert Level was lowered to Normal and the Aviation Color Code was lowered to Green.

Sources: Alaska Volcano Observatory (AVO)

2013: January |
2012: August | September | October |

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9 January 2013              Back to Top

On 9 January, AVO reported that unrest at Little Sitkin had decreased over the past several months, reaching background levels. The Volcano Alert Level was lowered to Normal and the Aviation Color Code was lowered to Green.

Sources: Alaska Volcano Observatory (AVO)

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17 October 2012              Back to Top

AVO reported that during 17-23 October seismic activity at Little Sitkin remained elevated and satellite views were mostly obscured by clouds. AVO noted that there were no other reports of unusual activity. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory.

Sources: Alaska Volcano Observatory (AVO)

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19 September 2012              Back to Top

AVO reported that during 19-24 September seismic activity at Little Sitkin remained elevated and satellite views were mostly obscured by clouds. On 21 September AVO noted that the frequency of earthquakes had declined during the previous week. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory.

Sources: Alaska Volcano Observatory (AVO)

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12 September 2012              Back to Top

AVO reported that during 11-18 September seismic activity at Little Sitkin remained elevated and satellite views were obscured by clouds. Two earthquake swarms were detected on 11 and 13 September. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory.

Sources: Alaska Volcano Observatory (AVO)

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5 September 2012              Back to Top

AVO reported that during 5-11 September seismic activity at Little Sitkin was much lower than the peak of activity during 29-30 August, but continued to remain elevated. Satellite views were obscured by clouds during 5 and 8-11 September. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory.

Sources: Alaska Volcano Observatory (AVO)

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29 August 2012              Back to Top

AVO reported that at approximately 1915 on 29 August a swarm of high-frequency earthquakes was detected at Little Sitkin. The anomalous seismic activity continued through the night, prompting AVO to raise the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory. The rate of anomalous seismicity varied during 30-31 August; the two most active periods were during the morning of 30 August and at about 0400 on 31 August. The rate of earthquakes started to decline at around 0600 on 31 August, but remained elevated through 3 September. Little Sitkin is monitored by a four-station seismic network as well as satellite imagery.

Sources: Alaska Volcano Observatory (AVO)

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Summary of eruption dates and Volcanic Explosivity Indices (VEI).

Start Date	Stop Date	Eruption Certainty	VEI	Evidence	Activity Area or Unit
1828	1830	Confirmed		Historical	Summit and west flank
1776	Unknown	Confirmed	1	Historical