Mysterious "super tsunami" shook the Earth for 9 days

A new satellite has recorded the first direct evidence of a mysterious nine-day seismic signal that shook the Earth in 2023.

Scientists have made the first direct observation of a bizarre seismic event that shook the Earth for nine consecutive days in 2023, confirming that it was caused by two “megatsunami” that hit a fjord in East Greenland. Photo: Thomas Monahan.

Giant waves, including one that was 200 meters high, half the height of the Empire State Building, hit Dickson Fjord in East Greenland and shook continuously for nine days in September 2023, creating seismic waves that traveled across the Earth's crust. Photo: Soren Rysgaard, Danish Army.

The signal was initially a mystery to scientists. However, ground and satellite imagery have revealed that the culprit may have been landslides in the fjord. Photo: SIRIUS/Arktisk Kommando.

Landslides created the waves, known as seiches, after the glacier behind the fjord melted due to climate change. However, no direct evidence of seiches has been found. Photo: Thomas Monahan.

Now, that hypothesis has been confirmed by a new satellite tracking water on the ocean’s surface. The findings were published in the journal Nature Communications. Photo: NASA/IPL-Caltech.

“Climate change is creating many new extreme processes that we have never seen before. Extreme processes are changing most rapidly in remote regions, such as the Arctic, where physical measurements are limited. This study shows how we can leverage next-generation Earth observation technology from satellites to understand these processes,” said lead author Thomas Monahan, a PhD student in engineering science at the University of Oxford. Photo: Soren Rysgaard/Dannish Army.

Scientists traditionally study tsunami movements using satellite altimetry, in which radar pulses are beamed to the ocean surface from orbit to measure the height of the waves based on the time it takes them to return. Photo: Soren Rysgaard/Dannish Army.

However, due to limited coverage and satellite equipment only measuring what is below, they cannot measure the height difference of water in a confined area like a fjord. Photo: EPA.

To confirm the existence of the seiches, the team used data collected by the Surface Water and Ocean Topography (SWOT) satellite, a joint project of NASA and CNES, the French space agency. Photo: Mail Online.

The data collected helped scientists reconstruct the waves and firmly link them to the mysterious seismic signal. Photo: Soren Rysgaard/Dannish Army.

Source: https://khoahocdoisong.vn/sieu-song-than-bi-an-lam-rung-chuyen-trai-dat-trong-9-ngay-post1545686.html