New Evidence That Venus Is Volcanically Active New research provides strong evidence of volcanic activity on Venus. The study identified a nearly 1-square-mile volcanic vent that changed shape and grew over eight months in 1991. Such changes on Earth are associated with volcanic activity, either th
Maat Mons is displayed in this computer-generated, three-dimensional perspective of the surface of Venus. The viewpoint is located 634 kilometers north of Maat Mons at an elevation of 3 kilometers above the terrain. Lava flows extend for hundreds of kilometers across the fractured plains shown in the foreground, to the base of Maat Mons. NASA Magellan mission synthetic aperture radar data is combined with radar altimetry to develop a three-dimensional map of the surface.
New research by University of Alaska Fairbanks Geophysical Institute research professor Robert Herrick revealed a nearly 1-square-mile volcanic vent that changed in shape and grew over eight months in 1991. Changes on such a scale on Earth are associated with volcanic activity, whether through an eruption at the vent or movement of magma beneath the vent that causes the vent walls to collapse and the vent to expand.
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.
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