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Wiktionary
fault trace

n. (context geology English) A line drawn on a map to represent the position of a fault line.

Wikipedia
Fault trace

A fault trace is the intersection of a geological fault with the ground surface, leaving a visible mark. The term also applies to a line plotted on a geological map to represent a fault.

Usage examples of "fault trace".

There was the fault trace of puzzlement dawning in his blank face.