As nouns the difference between hangingwall and footwall
is that hangingwall is alternative form of lang=en while footwall is the section of rock that extends below a diagonal fault line (the corresponding upper section being the hanging wall).
footwall
English
Noun
(
en noun)
(geology) The section of rock that extends below a diagonal fault line (the corresponding upper section being the hanging wall).
The under wall of an enclosed vein.