Massive Underwater Volcano Discovered off the Coast of Southeast Alaska

Photo Credit: Forest Service Geologist Jim BaichtalAbout 10,000 years ago, give or take a couple thousand years, a volcano blew its top in the middle of Behm Canal. The crater is still there, covered by 150 feet or so of ocean. But when the volcano exploded many thousands of years ago, it was not underwater. That’s what makes it so interesting.

Well, that and the fact that nobody currently living knew it was even there until just a few weeks ago.

U.S. Forest Service Geologist Jim Baichtal, who is based on Prince of Wales Island, and Anchorage USGS geologist Sue Karl were looking at some hydrographic surveys, something geologists tend to do.

When we were done, I noticed the area from Thorne Arm to Rudyerd had been surveyed,” Baichtal said. “I zoomed in and there was this large… some kind of volcano, and two other dome-like structures.”

Karl added that, “This new NOAA survey allowed us to see things that people had never seen before.”

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