Greenland: Siltanews – News Desk
Tsunamis are powerful natural phenomena capable of reshaping entire coastlines. Modern technology is now capable of helping scientists to study them in remarkable detail.
The ability to monitor and analyze these massive waves in real-time has revolutionized our understanding of their behavior and impact, providing invaluable data that can inform safety protocols and predictive models. This technological prowess recently helped unravel the nine-day-old reverberations of a tsunami in Greenland, a rare and complex event captured by the International SWOT Satellite.
The satellite’s advanced imaging capabilities revealed unprecedented insights into how the tsunami waves moved and persisted within the steep walls of Dickson Fjord, thereby contributing significantly to the field of oceanography.
At the core of this investigation were scientists from NASA’s Jet Propulsion Laboratory in Southern California and France’s CNES (Centre National d’Etudes Spatiales). These dedicated professionals collaborated on the international Surface Water and Ocean Topography (SWOT) satellite mission.
Their joint efforts led to the discovery of unique shapes formed by tsunamis trapped within the steep walls of Greenland’s Dickson Fjord.
On September 17, 2023, the day following a massive rockslide, the SWOT satellite was at the right place at the right time, collecting water elevation measurements in the Dickson Fjord.
By comparing these measurements with those recorded a few weeks prior, the scientists got a clear image of the aftermath of the tsunami.
A SWOT data visualization shows water on the northern side of Greenland’s Dickson Fjord at higher levels than on the southern side on Sept. 17, 2023. A huge rockslide into the fjord the previous day led to a tsunami lasting nine days that caused seismic rumbling around the world. Credit: NASA Earth Observatory
The SWOT satellite captured a colored data visualization, indicating higher water levels with lighter colors and lower levels with darker tones.
The findings suggested that the northern side of the fjord reached certain points where water levels were almost 4 feet (1.2 meters) higher than on the southern side.
“SWOT happened to fly over at a time when the water had piled up pretty high against the north wall of the fjord,” said Josh Willis, a sea level researcher at NASA’s Jet Propulsion Laboratory in Southern California. Seeing the shape of the wave – that’s something we could never do before SWOT.
More than 880 million cubic feet of rock and ice, equivalent to 25 million cubic meters, had plummeted into Dickson Fjord, triggering the tsunami that sloshed around within the fjord. The fjord is a part of a network of channels on Greenland’s eastern coast, with the depth of about 1,772 feet (540 meters) and width of 1.7 miles (2.7 kilometers), while its walls tower over 6,000 feet (1,830 meters) high. Interestingly, because the fjord is far from the open ocean and confined, the energy from the tsunami’s motion had limited opportunities to dissipate.
This resulted in the wave moving back and forth approximately every 90 seconds for a surprising duration of nine days. These findings demonstrate how modern technology can help us unravel nature’s mysteries. The international SWOT satellite, through its unique capabilities, has managed to provide us with a fresh understanding of tsunamis and their prolonged effects.