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Shishaldin reported activity





Event Name : Shishaldin 2008/6

This is a questionable event.

Start:June 3, 2008 Observed
Stop:August 3, 2008 Observed

Fumarolic or hydrothermal activity: BibCard
Steam: BibCard
Tephra plume: BibCard
Phreatic: BibCard
Eruption Type:Explosive

Description: From Neal and others (2011): "On June 3, AVO received a pilot report of a steam plume rising about 2,000 ft (610 m) above the summit. On July 27, AVO was contacted by a mariner from the fishing vessel Castle Cape who reported Shishaldin 'puffing' on July 26 between about 8 p.m. and 12 a.m. local time. He described ash falling from the dissipating puffs. For all of these reports, there were no unequivocal correlative changes in seismicity, nor did any ash signal or thermal anomaly appear in satellite images. On July 29, AVO staff flying by Shishaldin from Dutch Harbor en route to Anchorage noted a faint wisp of vapor from the summit crater; there was a hint of dark discoloration high on the east flank, but views were quite distant. AVO received images of the volcano from a NOAA scientist on July 30 and several additional pilot reports of a steam plume from Shishaldin arrived on August 3. It is possible that this spike in reports reflected increased vigilance on the part of pilots and others traveling in the Aleutians in the wake of the highly explosive and continuing eruption of Okmok Volcano about 300 km (190 mi) west of Shishaldin. Shishaldin also is easily visible from the air on approach into Dutch Harbor.

"AVO staff and colleagues from the Plate Boundary Observatory field team conducted instrument maintenance, installed 13 GPS stations, a broadband seismometer, 6 borehole tiltmeters, and a web camera, and relocated 4 seismic stations on Unimak Island from July 30 to August 22, 2008. They noted no obvious evidence of recent ash fall on the surface although they did observe some discoloration of the upper ice and snow cover, along with typical, weak fumarolic emission from the summit crater [figs. 10; imageid 15239, and 11; imageid 31882]."

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