Collapsed voids on the south-west flank of Ascraeus Mons
Collapsed voids on the south-west flank of Ascraeus Mons
Sinuous, downslope rilles with steep sides, flat bottoms and no raised rim occur frequently on the flanks of the large shield volcanoes on Mars. Starting from collapse structures, low-viscosity lava probably flowed continuously through them, eroding these narrow channels and troughs into a mechanically weak subsurface.
