Scientists offer evidence that Venus is volcanically active uafairbanks sciencemagazine
at the vent or movement of magma beneath the vent that causes the vent walls to collapse and the vent to expand.Herrick studied images taken in the early 1990s during the first two imaging cycles of NASA's Magellan space probe. Until recently, comparingto find new lava flows took too much time, the paper notes. As a result, few scientists have searched Magellan data for feature formation.
The vent had grown from a circular formation of just under 1 square mile to an irregular shape of about 1.5 square miles. The researchers offer one caveat: a nonvolcanic, earthquake-triggered collapse of the vent's walls might have caused the expansion. They note, however, that vent collapses of this scale on Earth's volcanoes have always been accompanied by nearby volcanic eruptions; magma withdraws from beneath the vent because it is going somewhere else.
"However, the estimates of how often eruptions might occur on Venus have been speculative, ranging from several large eruptions per year to one such eruption every several or even tens of years," he said.
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