AIRFIELD EDM Array
Number of Bench marks: 4
Number of Surveys to 1996: 4
Date of Initial Survey: 2 August 1984
Date of Latest Survey: 13 January 1996
Trespass Permission: Permission to trespass is required well in advance of anticipated work.
From Mojave, drive Hwy 395 north and northeast about 44 miles to Hwy 178. Proceed eastward 13 miles to the entrance of the Naval Weapons Center. Stop at the Visitor Cent er to obtain identification badges and for escort to Geothermal Program office. To reach the surveying site, proceed to Pole Line Road, thence north northeast, thence left on Water Road. Veer right at the Range Control Center. Drive 2.6 miles from the R ange Control Center. Just after a radar reflector consisting of a tetrahedron mounted on two poles, turn left on a paved road. Drive 1.3 miles and stop just before another gate. Point AF21 is to the left of the road and is marked by an 8" x 8" fence post.
This quadrilateral crosses one of the N-S normal faults evincing surface rupture following an earthquake swarm in Indian Wells Valley in 1982 (Roquemore and Zellmer, 1983). It is located five and one-half miles NNW of the town of Ridgecrest. The first tw o surveys were performed with an HP3808A distance meter; the third used a Wild TC2000. Bench marks are Class B rod marks driven to refusal and capped with a stainless steel nipple.
Roquemore, G. R., and J. T. Zellmer, 1983. Ground cracking associated with the 1982 magnitude 5.2 Indian Wells Valley earthquake. California Geology 30 (9), 197-200.
Sylvester, A. G., 1993. Investigation of afterslip following the M w 7.3 Landers earthquake of 28 June 1992, California. Geophysical Research Letters 20 (11), 1079-1082.
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