ESTIMATES OF THE DETECTION CAPABILITY OF FOUR VELA-UNIFORM SEISMOLOGICAL OBSERVATORIES.
Abstract
To empirically estimate the detection capabilities of the Blue Mountains Seismological Observatory, Cumberland Plateau Seismological Observatory, Uinta Basin Seismological Observatory, and Wichita Mountains Seismological Observatory, seismograms were synthesized by superposing teleseismic P-wave signals, essentially free of noise, on representative microseismic noise samples, free of known signals, from each observatory. The signals were summed into the noise randomly several times at each of several levels. Each of the resulting synthesized seismograms was analyzed independently by seven analysts experienced in the routine analysis of seismograms. Characterization of the background noise, based on visual measurements of every half cycle of the noise within a restricted period band determined by the dominant period of the signal, proved to be more effective in defining signal-to-noise ratio than other methods of noise characterization tested. Estimates of detection capability as a function of signal-to-noise ratio for the over-all effects of noise and signals on seismic signal detection. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 03, 1966
- Accession Number
- AD0480346
Entities
Organizations
- Teledyne Technologies