Oceanic fracture zones (FZ’s)
Rectilinear (straight), often for 1000’s of km across ocean basin
Narrow, usually <100 km and may be <10 km wide
Vertical relief across a FZ may be several km
Axial valleys offest as much as 1000’s of km across FZ’s
When FZ’s extend into abyssal plains, they are usually covered sedimentary rock