Earthsky Interviews
Private: A symphony of underwater sounds in Antarctica
July 4, 2007 - Water
– like a special “ear” for listening to sounds underwater – to learn more about earthquakes, ice sheets and marine life in Antarctica.
For example, here’s the “crooning of a humpback whale”:http://oregonstate.edu/events/newsevents/antarctic/humpbackm6_345.wav .
And here’s the “sound of an underwater earthquake”:http://oregonstate.edu/events/newsevents/antarctic/earthquake_d215h11_2x.wav . Robert Dziak leads the team from Oregon State University and the National Oceanic and Atmospheric Administration. They deployed several hydrophones in the frigid water off western Antarctica in late 2005. A year later, they returned to retrieve the data – which by then contained a year of recordings.
Dziak said the specific region they studied in Antarctica is the only volcanically and seismically active area at either pole. He mentioned large icebergs and ice sheets melting at both poles due to increased ocean temperatures. And he said he wanted to find out whether volcanic activity and earthquakes in the area could also be contributing to the ice breakup.
Data from the underwater sound sensors suggest that large sea floor earthquakes near the ice sheets do produce pressure waves in the water. These pressure waves from earthquakes might indeed contribute to breakup of the nearby ice sheets.
Our thanks today to “NOAA”:http://noaa.gov.
In addition, Dziak said: “We are still in the preliminary stages of data analysis. However, some early interesting finds have been detecting an incredibly loud ‘hum’ produced by an iceberg as it was moving through the ocean, scraping the sea floor. The hum went on for several days, and was so loud we were able to use it to locate the iceberg some 10 miles away. We were able to confirm the ~10-kilometer-long iceberg was the source of the sound because we found the iceberg on a satellite image.”
He said his team has detected sounds that might be a volcanic eruption from a deep (~1800 meter) volcano at the bottom of the Bransfield Strait, but added that more work is needed to confirm this.
The project is a component of the National Oceanic and Atmospheric Administration’s (NOAA) Ocean Explorer program.
“Sounds of the Antarctic Revealed: Earthquakes, Icebergs and Pygmy Whales”:http://oregonstate.edu/dept/ncs/newsarch/2007/Mar07/antarctic.html
“Sounds of the Antarctic Revealed: Video and Photo Archive”:http://oregonstate.edu/events/newsevents/antarctic/
*Our thanks to:*
Robert Dziak
Geophysicist
“Pacific Marine Environmental Laboratory”:http://www.pmel.noaa.gov/
NOAA and Oregon State University
It seems everything is gangin’ up on the ice sheets these days.
What if the scientists are wrong about the melting. What if it’s incredibly fast where ice sheets slide off the terrain much like a snow covered roof looses the snow in mini avalanches exposing the roof until its all gone. What about the plate that Europe sits on….weighted down on the far northern end by ice…..wait til that melts and Europe see saws beneath the ocean. No one foresaw this decades ago…it will just happen then all will figure it out as an afterthought. No one knows how quickly really. I’d like to think it’s 100 yrs away but I see it waaaay sooner just because……
I think that antartica is melting. I agree with scientists.