Sensitive microphones scattered across the Aleutian Arc – a chain of over 80 volcanoes that sweeps westward from the Alaskan peninsula – eavesdrop on every explosion, tremor and burp. Via InsideScience.
-- As a geophysicist at the Alaska Volcano Observatory, John Lyons spends much of his days trying to decipher the music of volcanic eruptions. Sensitive microphones scattered across the Aleutian Arc -- a chain of over 80 volcanoes that sweeps westward from the Alaskan peninsula -- eavesdrop on every explosion, tremor and burp.
The source of the odd sounds remained a mystery for months, until one of Lyons' colleagues stumbled upon a striking description of the ocean's surface during a 1908 Bogoslof eruption, observed from a Navy ship. As reported in a 1911 issue of The Technical World Magazine, officers reported seeing a"gigantic dome-like swelling, as large as the dome of the capitol at Washington [D.C.]." The dome shrank and grew until finally culminating in"great clouds of smoke and steam ...
"It’s hard to imagine a bubble so big, but the volumes of gas that we calculated to be inside the bubbles are similar to the volumes of gas that have been calculated for [open air] explosions," said Lyons."Take the big cloud of gas and ash that’s emitted from a volcano and imagine sticking that underwater. It has to come out somehow."
"I find the work groundbreaking and impactful," said Jeffrey B. Johnson, a geophysicist at Boise State University in Idaho who was not involved in the study."Giant bubbles which defy the imagination are able to oscillate and produce sound that you can record several kilometers away."
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