Wiktionary
fault-line
n. (alternative spelling of fault line English)
Usage examples of "fault-line".
To the east was an escarpment, a fault-line that saw the land falling sharply away eighty or more arm-lengths onto a salt flat - what had once been the inland sea's deepest bed.
The seismologists are afraid of fault-lines everywhere, that what could slip will slip, what could crack will crack.
The fissure was not just a narrow vertical fault-line it was a deep cleft that went not only into the rock tower but all the way up to the top.