When they did, a team of 68 scientists from 40 institutions collaborated to reconstruct the event. Using a combination of satellite imagery, field measurements, and advanced mathematical models, the researchers demonstrated that the vibrations were caused by water sloshing back and forth in the fjord, a phenomenon that continued for nine days.
The landslide, according to the study published in the journal Science, was triggered by the thinning of a glacier at the foot of the mountain, which could no longer support the weight of the rock above it. This was a direct result of the ongoing effects of climate crisis, which has significantly weakened Greenland’s glaciers in recent years.
Earlier studies have found that the Greenland ice cap is losing an average of 30 million tonnes of ice an hour due to the climate crisis, a result of rapidly increasing global temperatures due to carbon pollution created by burning coal, oil and gas.
From left: before (August 2023) and after (September 2023) photos of the mountain peak and glacier, taken from the fjord (Søren Rysgaard/Danish Army via University College London)
“This [landslide] event highlights the intricate interconnections between climate change in the atmosphere, destabilisation of glacier ice, movements of water bodies, and Earth’s solid crust,” said Dr Hicks.
“This is the first time that water sloshing has been recorded as vibrations through the Earth’s crust, travelling the world over and lasting several days.”
Lead author Dr Kristian Svennevig from the Geological Survey of Denmark and Greenland said that this was the first recorded landslide and tsunami in eastern Greenland.
“As a landslide scientist, an additional interesting aspect of this study is that this is the first-ever landslide and tsunami observed from eastern Greenland, showing how climate change already has major impacts there,” he said.
The tsunami was so unique that it tested the limits of current scientific models for simulating such events.
“This unique tsunami challenged the classical numerical models that we previously used to simulate just a few hours of tsunami propagation,” said co-author Anne Mangeney from the Paris Institute of Planetary Physics.
“We had to go to an unprecedentedly high numerical resolution to capture this long-duration event in Greenland. This opens up new avenues in the development of numerical methods for tsunami modelling.”
It measured up to 4 metres high and damaged a research base 70km away and destroyed cultural heritage sites.
Melting icebergs crowd the Ilulissat Icefjord on 15 July 2024 near Ilulissat, Greenland. Earlier this year scientists released a study in which they concluded that Greenland’s glaciers, which all descend from the Greenland Ice Sheet, have retreated about 20 per cent more than previously estimated (Getty Images)
While no cruise ships were near the fjord at the time, the researchers warn that such events could pose increasing risks in the future.
Scientists warn that more attention must be paid to these potentially catastrophic shifts in the Earth’s landscape in the future as the climate crisis worsens.
They say there is a need for continued monitoring of regions previously thought to be geologically stable to provide early warning of these massive landslide and tsunami events.
“We wouldn’t have discovered or been able to analyse this amazing event without networks of high-fidelity broadband seismic stations around the world,” co-author Thomas Forbriger of the Karlsruhe Institute of Technology said.
The Independent will be revealing its Climate100 List in September and hosting an event in New York, which can be attended online.
Source link : http://www.bing.com/news/apiclick.aspx?ref=FexRss&aid=&tid=66e9117ad8e8426798481b3dcc89ac31&url=https%3A%2F%2Fwww.independent.co.uk%2Fclimate-change%2Fnews%2Fgreenland-landslide-mega-tsunami-earth-b2612083.html&c=7602751299834010753&mkt=en-us
Author :
Publish date : 2024-09-12 13:00:00
Copyright for syndicated content belongs to the linked Source.
