At the risk of being pedantic, let me mention that if you are refering to
deformation (which is strain) then one should refer to "extension" and
"contraction" , but when refering to stresses "compression" and "tension" are
used.
Unfortunately the terms "transtenion" and 'transpression" are strain terms, but
are not consistent with the above usage (why the structural geology /tectonics
community has never addressed this inconsistency is a mystery to me).
Gren
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