Latitude: N 35°55'55"
Longitude: W 120°31'18"
Length: 1039.4m
Number of Bench marks: 19
Number of Surveys to 2000: 6
Date of Initial Survey: 26 June 1984 (UCSB)
Date of Latest Survey: 28 June 1990 (UCSB)
Trespass Permission: None needed although most of the line is on private
property.
Directions:
From the bridge at Parkfield, drive northwest on Vineyard Canyon Road. After
4.3 miles, Vineyard Canyon Road becomes Slack Canyon Road at a T intersection.
Continue 0.7 mile on Slack Canyon Road. The line begins at a power pole near
the fence on the south side of the road, follows the fence to a gate, and
turns southeast across the field and up an unnamed canyon.
Comments:
The L-shaped array was established by the U.S. Geological Survey as a tilt
array on the southwest side of the San Andreas fault northwest of Parkfield.
Points ECC01 and ECC02 were destroyed between 1987 and 1990.
Results:
From 1984 to 1990, bench mark heights have varied as much as a millimeter,
as shown in an accompanying diagram, but the entire array has shown no overall
tilt. Most of the bench marks in the SE-trending leg of the array have been
obliterated, so the array is all but abandoned.
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