In September 2023, scientists detected a mysterious global seismic signal repeating every 90 seconds over a span of nine days. Curiously, the same signal reappeared a month later. Nearly a year after the phenomenon, two independent studies have proposed a compelling explanation: the signals were caused by two massive tsunamis generated by large landslides in a remote East Greenland fjord. These landslides were likely triggered by the warming of a previously unnamed glacier.
The theory suggests that the resulting waves became trapped within the fjord system, bouncing back and forth to form standing waves known as seiches—ultimately causing the puzzling seismic pulses detected across the globe. However, direct observation of these seiches had remained elusive. Even a Danish military vessel that visited the site during the early stages of the event failed to detect the waves responsible.
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A new study published in Nature Communications by researchers from the University of Oxford has provided the first visual confirmation of these waves using innovative satellite technology. The team employed satellite altimetry, a technique that measures the Earth's surface elevation by calculating the time taken for radar pulses to return from the surface.
Conventional satellite altimeters, which collect data in narrow, one-dimensional profiles directly beneath the spacecraft, had previously been unable to detect the subtle water-level changes associated with seiches due to limited temporal and spatial coverage.
The breakthrough came with data from the Surface Water and Ocean Topography (SWOT) satellite, launched in December 2022. SWOT is equipped with the Ka-band Radar Interferometer (KaRIn), a sophisticated instrument featuring two antennas mounted on either side of a 10-meter boom. This setup enables precise triangulation of return signals and can measure water height with a resolution of up to 2.5 meters across a 50-kilometer-wide swath.
Using this advanced instrument, researchers constructed elevation maps of the fjord at different times following the tsunamis. These maps revealed distinct cross-channel slopes with elevation differences up to two meters, reversing directions over time—clear evidence of water sloshing back and forth as standing waves.
To further support their hypothesis, the team correlated these surface water movements with minute shifts in Earth's crust recorded thousands of kilometers away. They also accounted for weather and tidal influences, ruling them out as potential causes of the observed wave activity.
Lead author Thomas Monahan, a DPhil student in Oxford’s Department of Engineering Science, emphasized the significance of this work: “Climate change is giving rise to new, unseen extremes, especially in remote Arctic regions where direct measurement is limited. This study demonstrates how new satellite technology can help us observe and understand these emerging phenomena.”
Co-author Professor Thomas Adcock added, “This is a prime example of how next-generation satellite data can solve long-standing mysteries. These tools will allow us to better understand oceanic extremes such as tsunamis, storm surges, and rogue waves. But unlocking their full potential will require innovative thinking, combining machine learning with deep knowledge of ocean physics.”
The theory suggests that the resulting waves became trapped within the fjord system, bouncing back and forth to form standing waves known as seiches—ultimately causing the puzzling seismic pulses detected across the globe. However, direct observation of these seiches had remained elusive. Even a Danish military vessel that visited the site during the early stages of the event failed to detect the waves responsible.
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A new study published in Nature Communications by researchers from the University of Oxford has provided the first visual confirmation of these waves using innovative satellite technology. The team employed satellite altimetry, a technique that measures the Earth's surface elevation by calculating the time taken for radar pulses to return from the surface.
Conventional satellite altimeters, which collect data in narrow, one-dimensional profiles directly beneath the spacecraft, had previously been unable to detect the subtle water-level changes associated with seiches due to limited temporal and spatial coverage.
The breakthrough came with data from the Surface Water and Ocean Topography (SWOT) satellite, launched in December 2022. SWOT is equipped with the Ka-band Radar Interferometer (KaRIn), a sophisticated instrument featuring two antennas mounted on either side of a 10-meter boom. This setup enables precise triangulation of return signals and can measure water height with a resolution of up to 2.5 meters across a 50-kilometer-wide swath.
Using this advanced instrument, researchers constructed elevation maps of the fjord at different times following the tsunamis. These maps revealed distinct cross-channel slopes with elevation differences up to two meters, reversing directions over time—clear evidence of water sloshing back and forth as standing waves.
To further support their hypothesis, the team correlated these surface water movements with minute shifts in Earth's crust recorded thousands of kilometers away. They also accounted for weather and tidal influences, ruling them out as potential causes of the observed wave activity.
Lead author Thomas Monahan, a DPhil student in Oxford’s Department of Engineering Science, emphasized the significance of this work: “Climate change is giving rise to new, unseen extremes, especially in remote Arctic regions where direct measurement is limited. This study demonstrates how new satellite technology can help us observe and understand these emerging phenomena.”
Co-author Professor Thomas Adcock added, “This is a prime example of how next-generation satellite data can solve long-standing mysteries. These tools will allow us to better understand oceanic extremes such as tsunamis, storm surges, and rogue waves. But unlocking their full potential will require innovative thinking, combining machine learning with deep knowledge of ocean physics.”
