Does Mercury Have Any Volcanoes?

Does Mercury Have Volcanoes — These valleys on the surface of Mercury have been interpreted by MESSENGER team scientists as having formed due to mechanical and thermal erosion of Mercury’s surface by hot, low-viscosity, quickly-flowing lavas.

Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

Does Mercury Have Any Volcanoes?

Mercury does have volcanoes. When the Messenger spacecraft returned photos of Mercury’s surface, scientists found images suggesting the presence of many volcanoes on the planet’s surface. However, these volcanoes are all extinct and have been for perhaps billions of years.

Evidence of Volcanic Activity

The images from Messenger show many features that appear to have been caused by volcanic activity. There are irregular depressions on the surface that are more consistent with volcanic vents than with meteoric impact. Craters tend to be more regular and circular, so celestial collisions unlikely caused these features. Scientists can also see what appears to be evidence of lava flows surrounding those vents. Also, Mercury has many impact craters on the surface, and some of them appear to have had lava flows partially fill them after the impact.

Evidence of Tectonic Activity

Scientists also found pictures of long ridges on Mercury’s surface, probably dating from the time when Mercury was volcanically active. When the crust and mantle cooled on top of the molten core, the planet would have contacted, buckling and cracking as it cooled, causing these long mountainous ridges.

Mercury Volcanically Dormant Now

However, none of the images from Messenger show any signs of recent volcanic activity. All the visual evidence appears to be from the far distant past. Scientists are still debating how far distant. Some believe that the activity was from the very formation of the Solar System, so about 4 billion years ago. However, some scientists have found evidence from a huge impact crater that appears somewhat more recent, so they believe that Mercury could have had some volcanic activity as recently as 1 to 2 billion years ago. In either case, the volcanic stage of Mercury’s life has long since passed. There are presently no active volcanoes on the surface of Mercury.