Being reclassified as “historically active” doesn’t mean Mt. Edgecumbe is about to erupt. But the volcano will get more attention from scientists.
“It’s a word that isn’t very well defined in volcanology,” said geologist Cheryl Cameron of the Alaska Volcano Observatory. “It doesn’t have a lot of specific meaning to us. And instead, we tend to talk about volcanoes with how recent or long ago it’s been since they were active, or since they had an eruption.”
Mt. Edgecumbe was formerly known as a “Holocene” volcano because the geologic evidence of its last major eruption dates from the Holocene era, around 12,000 years ago. The AVO now classifies Mt. Edgecumbe as “historically active.” A “recent eruption” usually means within the last 300 years, but the AVO recognizes that Native oral histories indicate an eruption history that goes a few hundred years beyond that.
Cameron says a geophysical team was on the ground in Sitka to do a temporary seismic installation on Kruzof Island that includes a global positioning system. The GPS can provide data in real time about any deformation of the crust that might be happening.
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