DEEP WELL ARRAY OPERATIONS
Final rept. 1 Mar 1967-31 May 1968
GEOTECH GARLAND TX
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A deephole array consisting of 12 short-period triaxial seismometers was operated at a test site near Grapevine, Texas GVTX until 23 February 1968. The system was then put in a standby status until additional software could be developed to provide additional filtering capabilities. The complete system was shut down and all of the instrumentation and equipment was moved into storage areas at the Geotech plant in Garland, Texas, during the last week of May. The information gathered from the short-period triaxial array at the GVTX site was used to study short-period noise and signals, to develop signal enhancement, and filtering techniques. Most of the time was used in trying techniques based on least-mean-square filtering. In general, it can be concluded that because the noise is not stationary, these filters degrade too rapidly to be of practical interest for online processing. Several non-optimum filtering techniques were also tried and were found to be as effective as the optimum filters.