Mars Express Uncovers Collapsed Chains of Craters on Giant Martian Volcano — The Mars Express spacecraf |
This image from ESA’s Mars Express shows the southern flanks of Ascraeus Mons, the second-tallest volcano on Mars. Credit: ESA/DLR/FU BerlinExpress spacecraft has revealed fascinating features on Ascraeus Mons, Mars’ second-largest shield volcano. The images depict areas of collapsed underground lava flows and sinuous channels, covering a 70 km area, contributing to our understanding of Martian volcanism.
The images show regions where underground lava flows emptied out of chambers or tubes, which then collapsed into chains of craters. There are also smaller snakelike channels called “sinuous rilles,” which meander in a curved path like a river. They are commonly thought to be the remains of smaller collapsed lava tubes, but scientists are still unsure how they form.
Deep, irregular fissures in the Martian surface can be seen snaking toward the camera. These are part of a group of features collectively named Ascraeus Chasmata, which encompasses an enormous patch of collapsed terrain over 70 km across. The part shown here formed as strings of circular or near-circular depressions combined and coalesced to form troughs, causing the ground to collapse – a bit like forming a sinkhole.
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