NASA’s New Satellite Reveals Surprising Moves of a Giant Tsunami

A NASA‑built satellite called SWOT (Surface Water and Ocean Topography) has given scientists a first‑look at a massive tsunami in a way they never expected. The wave was triggered by a 7.7‑magnitude earthquake that struck central Myanmar in March 2025, one of the strongest quakes in a hundred years. While traditional buoys and the DART system can record a tsunami at a single point, SWOT scans a swath up to 120 kilometers wide, delivering a high‑resolution “snapshot” of the sea surface across a huge area. When the satellite passed over the ocean after the quake, it captured the tsunami’s shape, speed, and, surprisingly, a sideways spreading motion that had never been seen from space before. Researchers say the data act like a new pair of glasses, turning a vague line‑like signal into a detailed picture of the wave’s full structure. This breakthrough helps scientists understand how such giant waves travel, interact with currents, and lose energy, which could improve early‑warning systems and coastal safety plans. The discovery highlights how a satellite designed for everyday water monitoring can become a powerful tool for studying natural disasters.

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