650-Foot High Megatsunami in Greenland Sends Seismic Waves Worldwide
By Seismological Society of America
September 10, 2024
5 Mins Read
In September 2023, a megatsunami in Greenland triggered seismic waves worldwide, caused by a landslide in Dickson Fjord. The event generated two seismic signals: a high-energy signal from the landslide and a long-lasting VLP signal from a seiche in the fjord. The findings offer new insights into the risks posed by climate change and landslides in Greenland.
In September 2023, a massive tsunami in remote eastern Greenland triggered seismic waves that captured the attention of researchers worldwide.
The event created a week-long oscillating wave in Dickson Fjord, according to a new report in The Seismic Record.
Angela Carrillo-Ponce of GFZ German Research Centre for Geoscience and her colleagues identified two distinct signals in the seismic data from the event: one high-energy signal caused by the massive rockslide that generated the tsunami, and one very long-period (VLP) signal that lasted over a week.
Their analysis of the VLP signal—which was detected as far as 5000 kilometers (3100 miles) away—suggests that the landslide and resulting tsunami created a seiche, or a standing wave that oscillates in a body of water. In this case, the seiche was churning for days between the shores of Dickson Fjord.
More:
https://scitechdaily.com/650-foot-high-megatsunami-in-greenland-sends-seismic-waves-worldwide/
= new reply since forum marked as read
Drag button left to see how the glacier and mountainside changed
. . .
- interactive images at link -
Landslides like this, scientists say, are happening more frequently with climate change - as the glaciers that support Greenland's mountains melt.
The results of the investigation into this event, which are published in the journal Science, are the result of a detective mission involving an international team of scientists and the Danish Navy.
“When colleagues first spotted this signal last year, it looked nothing like an earthquake. We called it an ‘unidentified seismic object’,” recalled Dr Stephen Hicks from UCL, one of the scientists involved.
“It kept appearing - every 90 seconds for nine days.”
A group of curious scientists started to discuss the baffling signal on an online chat platform.
. . .
Scientists say it was 'pure luck' that there were no boats in the area when the landslide happened
. . .
The event at Dickson Fjord, Dr Hicks added, “is the perhaps first time a climate change event has impacted the crust beneath our feet all the world over.”
https://www.bbc.com/news/articles/cged3jd8llyo