South Sarigan Seamount volcano (Mariana Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 26 May-1 June 2010 (New Activity / Unrest)

On 27 May an observer from the Emergency Management Office (EMO) in Saipan photographed an area of discolored ocean water and possible light-colored floating material about 7 km S of Sarigan during an overflight. The area was about 1.6 km long, although the scale was difficult to discern from photographs. Two days later, the area of affected water was about twice the size of Sarigan Island.
According to a news article, U.S. Fish and Wildlife evacuated 16 people, mostly scientists, to Saipan from a few area islands, including eight people from Sarigan.

On 30 May a plume of mostly water vapor was seen in satellite imagery rising to a possible altitude of 12.2 km (40,000 ft) a.s.l. and dissipating as it drifted S. The eruption was attributed to a 300-m-deep submarine vent on Sarigan's S flank, about 7 km from the island.
Observers on Sarigan reported hearing a loud explosion from the S, and shortly thereafter received ashfall. The Volcano Alert Level was raised to Watch and the Aviation Color Code was raised to Orange. Both seismicity at a single nearby station on Sarigan and subaqueous activity declined after the plume emission.
The next day the Volcano Alert Level was reduced to Advisory and the Aviation Color Code was reduced to Yellow.

Sources: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program, Saipan Tribune
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From: Global Volcanism Program, 2010. Report on South Sarigan Seamount. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 26 May-1 June 2010. Smithsonian Institution and US Geological Survey.