Seismic Data Analysis Center
Final rept. Jul 1973-Jul 1975
TELEDYNE GEOTECH ALEXANDRIA VA SEISMIC DATA ANALYSIS CENTER
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One of the more important results of this work was the performance of the seismic event processing systems. Of 265,453 primary automatic detections during the period, 16,344 were declared legitimate events after a second automatic detection run based on a more stringent criterion than the primary run, and after visual analysis these were subsequently reported in daily and weekly summaries. During these two years of operation of the on-line and batch processors, the capabilities of the systems were improved by upgrading techniques and by modifying and correcting system software. Scientists at the SDAC completed and published 22 reports which deal with the seismological aspects of the work. Eight of the reports concerned the detection of seismic waves by arrays and networks. Seven reports dealt with test evasion and counter- evasion techniques, two studies described path affects, and one explained a new source theory. Of the four remaining reports, one described new source discriminates, two concerned the event location capability of a large array, and one was a special analysis of the Rio Blanco explosion. Six reports were completed in Network Research studies. Three of these evaluated the ILLIAC computer as a processor of seismic data, two reports evaluated the SDAC as network headquarters, and the last described seismic data files. In addition the design and documentation plans were completed for the revised LASA Processing System LASAPS, for the new Detection Processor, and for the Network Event Processor. The coding, testing, and demonstration of the LASAPS system were also completed.