S At first, the whale chatter was just a nuisance.
When Seattle scientists set out to monitor earthquakes off the Northwest coast, they expected their underwater seismometers to occasionally pick up the booming voice of the fin whale -- the second-largest creature on Earth. But what they wound up with was such a cacophony that they had trouble zeroing in on the actual tremors.
"It was a very big pain," said William Wilcock, a marine geophysicist at the University of Washington.
To separate tens of thousands of small quakes from hundreds of thousands of whale calls, he and his students were forced to write their own automated program. Now, they're mining that mountain of discarded data for insights into one of the sea's least-known and most endangered giants.
"Basically, we can track the whales using techniques very similar to the ones we use to locate earthquakes," Wilcock said.
Second only to blue whales in size, fin whales remain shrouded in mystery because they're so challenging to study. Nobody knows where they give birth or even why they sing.
"When I started this project, I was really surprised by how little is actually known about them," said doctoral student Michelle Weirathmueller. With seafloor seismic monitoring on the rise, her goal is to fill in some of those gaps.
"The thing that's neat about this is that we are basically piggybacking on experiments that were designed for something completely different," she said.
Already, the UW team has discovered that some fin whales migrate north in the fall -- a time when biologists assumed most of the whales would be headed south to breed.
Learning more about the species' movements, behavior and communication patterns could bolster efforts to protect fin whales from further harm, now that they are beginning to rebound from decades of whaling, said John Calambokidis, whale biologist and co-founder of the Olympia-based Cascadia Research Collective.
A recent study found that fin and blue whales are more likely to be struck by ships than any other whale species on the West Coast, he pointed out.
Puget Sound residents got a gory demonstration last month, when part of a fin-whale carcass washed up on a beach near Burien. Scientists said the animal was killed by a ship and dragged into the sound.
Usually, fin whales stick to deep water offshore _ which is one of the reasons they haven't been studied much, Calambokidis said. Tagging and tracking is expensive, and so are ship-based expeditions to observe and follow whales.
Fixed arrays of seismic instruments offer a promising alternative.
"It's clearly going to be an important and very-cost effective future direction," he said.
Reaching up to 85 feet in length and weighing in at up to 80 tons, fin whales earned the nickname "greyhounds of the sea" because of their sleek build and explosive speed. They also produce some of the loudest noises in the animal kingdom.
"It's just this amazing sound," Weirathmueller said.
The whales let loose with their short, basso profondo blasts roughly every 25 seconds, often continuing for a day or more. They pause only to breathe. The pattern is so regular that scientists who first recorded the song thought it was coming from some man-made device.
The whales' calls can travel thousands of miles through water. If unleashed on
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