Aganippe Fossa – a 600-kilometre-long valley with an unclear origin

Aganippe Fossa – a 600-kilometre-long valley with an unclear origin
Aganippe Fossa – a 600-kilometre-long valley with an unclear origin
The Aganippe Fossa valley lies at the north-western flank of the Arsia Mons volcano. The boundary walls of the graben are three to seven kilometres apart. It is not clear how the Aganippe Fossa was formed: the scar could have been created as a result of volcanic activity in the region as a graben of tectonic origin and crustal expansion. However, the appearance and shape of the Aganippe Fossa also suggests that these long depressions were formed as a result of the collapse of the cover of underlying lava tubes. A cavity is created as the lava flow inside continues to flow and drain through this insulating rock cover. When the roof of this tunnel collapses, the semi-tubular flow channel remains.
Credit:

ESA/DLR/FU Berlin, CC BY-SA 3.0 IGO

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