Latitude: 35š44'52"
Longitude: 117š45'00"

Number of Bench marks: 4

Number of Surveys to 1996: 4
Date of Initial Survey: 2 August 1984
Date of Latest Survey: 14 January 1996

Trespass Permission: Trespass permission must be requested well in advance of any anticipated work.

Directions: 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 Center to obtain identification badges and for escort to Geothermal Program office. To reach the surveying site, proceed to Pole Line Road and turn left on Water Road. Veer right at the Range Control C enter. Drive 5.9 miles from the Range Control Center, through the "very low-flying aircraft" zone, and turn left on a dirt road. Drive about 0.5 mile and park between a clump of trees (to the left) and a trench (to the right). Bench mark S01, the southea st corner of the quadrilateral, is at a fence post by the clump of trees.

Comments: 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 two surveys were performed with an HP3808A distance meter which measures slope lengths. The third was done with a Wild TC2000 total station distance meter. Bench marks ar e 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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