Semiannual Report, Project T/4703 Special Data Collection Systems.
Technical rept. Jul-Dec 76,
TELEDYNE GEOTECH GARLAND TEX
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Two SDCS Special Data Collection Systems systems which were deployed in early 1975 remained in operation at their original sites. These sites are at Houlton, Maine, and Red Lake, Ontario. The Houlton site uses a Model 36000 borehole seisometer system and the Red Lake site uses standard SDCS surface instrumentation. Both sites collect three-component data from long- and short-period systems. The sites at Cumberland Plateau Observatory, Tennessee Franklin, West Virginia and Whitehorse, Yukon, remained in operation until 28 July when operations were terminated in order to move the equipment to three locations on the Nevada Test Site. Two of the stations NT-NV and NT2NV are located on Pahute Mesa and the third is located on the Climax stock in NTS Area 15 OB2NV. These stations are being used to collect short-period data only for studies under the Seismic Data Analysis Center program to investigate a potential NTS magnitude bias using teleseismic signals. All data analysi and processing under this program was transferred to the SDAC program on 1 August 1976. All stations used digital recording systems during this period to collect data in digital format for more rapid data processing. The systems have operated properly most of the time but failures in the system memory circuits have been a continuing problem. It is hoped that a new-design circuit will solve these problems soon. Author
- Seismic Detection and Detectors