WASHINGTON—The powerful Jan. 15 underwater eruption of Tonga’s Hunga Tonga-Hunga Ha'apai volcano in the South Pacific produced a plume that soared higher into Earth’s atmosphere than any other on record—about 35 miles (57 km)—as it extended more than halfway to space, researchers said on Thursday.
The white-grayish plume unleashed by the eruption in the Polynesian archipelago became the first one documented to have penetrated a frigid layer of the atmosphere called the mesosphere, according to scientists who employed a novel technique using multiple satellite images to measure its height.
