The photo, which the USGS posted on Twitter late last month, was taken in October of 1969, during the 10th fountaining episode of the Mauna Ulu eruption so named because the eruption originated from the Mauna Ulu cone on Kīlauea s east rift zone. The image shows a red dome of lava on the horizon of what appears to be a body of water. But the scene is actually set on a stretch of cooled lava, Signe Dean explains in Science Alert. The dome is about 65 feet high, but a second image taken at another time shows it grew even larger, possibly to a height of 246 feet.
Lava fountains erupt either from isolated vents in lava lakes, or from lava tubes that are penetrated by water, according to the USGS. The formation and expansion of gas bubbles in molten rock pushes powerful streams of lava into the air typically in a haphazard fashion, with the fountains spurting every which way. It is rare, the USGS notes, for the fountain to take the shape of a dome, like the one seen at Mauna Ulu.
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7 лет назад
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https://www.smithsonianmag.com/smart-news/usgs-shares-archival-photo-rare-domed-lava-fountain-180968773/https://www.smithsonianmag.com/smart-news/usgs-shares-archival-photo-rare-domed-lava-fountain-180968773/
The photo, which the USGS posted on Twitter late last month, was taken in October of 1969, during the 10th fountaining episode of the Mauna Ulu eruption so named because the eruption originated from the Mauna Ulu cone on Kīlauea s east rift zone. The image shows a red dome of lava on the horizon of what appears to be a body of water. But the scene is actually set on a stretch of cooled lava, Signe Dean explains in Science Alert. The dome is about 65 feet high, but a second image taken at another time shows it grew even larger, possibly to a height of 246 feet.
Lava fountains erupt either from isolated vents in lava lakes, or from lava tubes that are penetrated by water, according to the USGS. The formation and expansion of gas bubbles in molten rock pushes powerful streams of lava into the air typically in a haphazard fashion, with the fountains spurting every which way. It is rare, the USGS notes, for the fountain to take the shape of a dome, like the one seen at Mauna Ulu.
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