strike-slip fault

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A fault in which surfaces on opposite sides of the fault plane have moved horizontally and parallel to the strike of the fault.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun geology A fault where two blocks move horizontally in opposite directions along the fault line.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a geological fault in which one of the adjacent surfaces appears to have moved horizontally