Arsia Mons
The caldera on Arsia Mons is considerably larger than the
calderas on either Ascraeus Mons or Pavonis Mons. However, the last major collapse
event on Arsia Mons was followed by a substantial outpouring of lava within the
caldera. The caldera rim has been breached on the southwest side while the caldera
floor lavas bury portions of the northeast rim. Aligned between these breaks in the
caldera is a series of very subdued domes on the caldera floor, perhaps representing
localized sources of the lava that flooded the caldera. The flaks of the shield have
been deeply eroded near the locations of the breaks in the caldera rim and lava flows
extend away from the volcanoes at these embayments