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Mysterious seismic event that shook the earth for 9 days was triggered by a 650-foot tsunami in Greenland, researchers say
A tsunami stemming from a landslide in a Greenland fjord, caused by melting ice, was behind a surprising seismic event last year that shook the earth for nine days, a researcher told AFP on Friday.
According to a report recently published in the scientific journal Science, tremors that were registered in September 2023 originated from the massive wave rocking back and forth in the Dickson fjord in Greenland’s remote east.
“The completely unique thing about this event is how long the seismic signal lasted and how constant the frequency was,” one of the authors of the report, Kristian Svennevig, from the Geological Survey of Denmark and Greenland, told AFP.
“Other landslides and tsunamis have produced seismic signals but only for a couple of hours and very locally. This one was observed globally all the way to the Antarctic,” he said.
The phenomenon initially surprised the scientific community, which began by defining it as an “unidentified seismic object” before determining that the source was the landslide.
In September 2023, 882 million cubic feet of rock and ice — a volume equivalent to 25 Empire State Buildings — fell into the fjord in the remote and uninhabited area, about 124 miles from the ocean.
The landslide triggered a 650-foot-high mega-tsunami at its epicenter.
Over 40 miles away, tsunami waves over a dozen feet high damaged a research base on the island of Ella.
“When colleagues first spotted this signal last year, it looked nothing like an earthquake,” Stephen Hicks, a scientist who has a doctorate in earth sciences and was involved in the report, told BBC News. “It kept appearing — every 90 seconds for nine days.”
A group of scientists started to discuss the strange signal on an online chat platform, according to BBC News.
The team created a model that showed how the wave sloshed back and forth for nine days.
“We’ve never seen such a large scale movement of water over such a long period,” Hicks told BBC News.
The collapse was caused by the thinning of the glacier at the base of the mountain, a process accelerated by climate change, according to the report.
“With the Arctic continuing to warm we may expect the frequency and magnitude of such events to increase in the future,” Svennevig said.
“We have no experience with dealing with an Arctic as warm as we observe now,” he added.
He stressed the need for early warning systems to be put in place, but noted that it was a challenge in such extreme environments.
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Yellowstone hiker burned when she falls into scalding water near Old Faithful, park officials say
Yellowstone National Park, Wyo. — A New Hampshire woman suffered severe burns on her leg after hiking off-trail in Yellowstone National Park and falling into scalding water in a thermal area near the Old Faithful geyser, park officials said.
The 60-year-old woman from Windsor, New Hampshire, along with her husband and their leashed dog were walking off a designated trail near the Mallard Lake Trailhead on Monday afternoon when she broke through a thin crust over the water and suffered second- and third-degree burns to her lower leg, park officials said. Her husband and the dog weren’t injured.
The woman was flown to Eastern Idaho Regional Medical Center in Idaho Falls, Idaho for treatment.
National Park Service / Jacob W. Frank
Park visitors are reminded to stay on boardwalks and trails in hydrothermal areas and exercise extreme caution. The ground in those areas is fragile and thin and there’s scalding water just below the surface, park officials said.
Pets are allowed in limited, developed areas of Yellowstone park but are prohibited on boardwalks, hiking trails, in the backcountry and in thermal areas.
The incident is under investigation. The woman’s name wasn’t made public.
This is the first known thermal injury in Yellowstone in 2024, park officials said in a statement. The park had recorded 3.5 million visitors through August this year.
Hot springs have injured and killed more people in Yellowstone National Park than any other natural feature, the National Park Service said. At least 22 people have died from hot spring-related injuries in and around the 3,471-square-mile national park since 1890, park officials have said.