Alaskan volcano stirs

Alaska’s Shishaldin volcano has experienced small explosions over the past few weeks, geologists say. The numbers of explosions have varied from several to more than 200 per day, but no steam or ash plumes have been observed by airborne and ground observers.

Also, no indications of any possible eruption have been observed in satellite imagery; thermal imaging typically reveals if lava has reached the surface. It is likely that the explosions are “phreatic,” caused by the flashing of water to steam. These events may represent a local hazard within a few hundred meters of the vent but otherwise do not pose a hazard, experts said.

The 9,373-foot volcano erupted last April, sending ash and steam 45,000 feet into the atmosphere.

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