Transform Fault
Kevin R.

http://geo.lsa.umich.edu/~crlb/COURSES/270/Lec14/Lec14.html
A transform fault is a type of strike-slip fault in an ocean, occurring at the boundaries of lithosperic plates, in which the direction of movement of the crustal blocks is reversed in similarity to a strike-slip fault on land. At mid-ocean ridges the offset between adjacement ridge sections is a transform fault. Usually Transform Faults occur at right angles