New research finds that 5 earthquakes over several minutes in the South Atlantic in August triggered the tsunami that was recorded around the world.
Antarctic fur seals and king penguins on a beach at Salisbury Plain on South Georgia Island near the South Sandwich Islands, the location of the series of earthquakes in August.Evan Bush
Algorithms that characterize earthquakes were failing, he said. A tsunami was triggered that would send waves traveling around the world. “We were aware of the tsunami right away,” said Summer Ohlendorf, a science officer at the U.S. National Tsunami Warning Center, who was not part of the new research. “It was a little larger than would have been expected based on the earthquake parameters.”
He said there aren’t hard and fast rules about when a tsunami can cause inundation because it depends so much about the nature of the coastline affected. But when waves exceed 1 meter that’s when “you have to worry about inundation threat,” he said. The South Sandwich Islands, a British overseas territory, are a series of small volcano-formed land masses that are more than 1,000 miles from the southern tip of South America. About half of the islands’ landscape is permanently covered in ice.
To examine what happened in detail, the Caltech researchers built a new algorithm that was able to break down the earthquake into five different quake events.
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