The PAS1 site is located behind the IRIS/PASSCAL facility outside of Socorro New Mexico in an area set aside as a test bed for PASSCAL seismic installations. There is no exposed bedrock, only massive, course alluvial fan deposits with clasts of rhyolite, volcanic tuff, and breccias cemented with CaC03. Due to the lack of bedrock, we install modified NGS CORS pillar monument (Figure 1). The poured concrete monument consists of a 2-ft diameter below ground base to a depth of 12-feet and a 12-inch diameter above ground pillar to a height of 5 feet. A 2-inch diameter stainless steel antenna mast is placed such that its threads are 8 inches above the top of the concrete monument. The top of the concrete monument is beveled to shed water. A SCIGN antenna adapter holds the antenna to the mast and a tall radome covers the antenna. A deeply anchored concrete monument of this type should provide sufficient mechanical stability for this study as well as for precise geodetic surveying. We should be able to test the stability of the monument by monitoring the displacement of PAS1 relative to SC01 (10 km away on M-Mountain) and PIE1 (120 km away at Pie town NM).

Further information can be found here:
Joint IRIS/UNAVCO/SCIGN GPS Installation for GPS/Seismic Integration at the IRIS PASSCAL Facility

Last modified Wednesday, 15-Feb-2006 01:38:44 UTC

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