英国新研究证实奇特地震信号成因

Core Insights - A new study from the University of Oxford confirms that two giant tsunamis near Greenland are the cause of unusual global seismic activity observed between September and October 2023 [1] - Climate change is triggering unprecedented extreme events, particularly in remote areas like the Arctic, where changes are most pronounced [1][2] Group 1 - The research team detected a peculiar global seismic signal occurring every 90 seconds for a duration of 9 days in September 2023, with a similar phenomenon reappearing a month later [1] - The two giant tsunamis in the Dickson Fjord, caused by large-scale landslides from a nameless glacier due to global warming, generated seismic signals as ocean waves became trapped in the fjord system [1] - The Oxford researchers published their findings in the journal Nature Communications, providing evidence through data captured by the Surface Water and Ocean Topography (SWOT) satellite launched in December 2022, which illustrated water level changes in the fjord after the tsunamis [1] Group 2 - The researchers linked their observations to minor crustal movements thousands of kilometers away, allowing them to reconstruct wave characteristics during periods not observed by the satellite [2] - They also analyzed weather and tidal conditions to rule out the possibility that wind or tides caused the observed results [2] - The study highlights the capabilities of the new generation of Earth observation satellites in monitoring extreme events in remote regions where physical sensor usage is limited [2]