GOVERNMENT CANYON EDM Array
Number of Bench marks: 4
Number of Surveys to 1993: 7
Date of Initial Survey: 9 September 1988
Date of Latest Survey: 19 June 1991
Trespass Permission: Wrightwood Water District
Directions: Proceed west about 3 km from the Park Drive-In in Wrightwood to a turnout on the south side of the highway. Bench mark WW I is 23 m south of the edge of the turnout. Bench marks are Class B rod marks driven to refusal and capped with a stainless steel nipple.
Comments: This quadrilateral spans the San Andreas fault at the confluence of Government Canyon and Swarthout Valley. This is the site of an extensive series of trenches across the San Andreas fault under the direction of David Schwartz, Tom Fumal, and Ray Weldon o f the U.S. Geological Survey.
Results: No changes in lengths have been observed in the time period this array has existed.
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