The AZGS is cooperating in a trenching project on the Washington fault, 3 miles south of the Arizona-Utah border. The Utah Geological Survey is funding the project because of the potential seismic risk to Washington City, in Utah [right, credit UGS]. Bill Lund, who heads the UGS Southern Utah office says they have evidence for at least two ruptures in the trench. He hopes to get enough material for accurate age dates of the events.
AZGS staff will be on site next week to examine the trench and consider the impacts for Arizona.