Evaluation of the Detection Capabilities of the UBSO Long-Period Array
Abstract
Three events from different directions were selected from which both a P and a Rayleigh waves energy was recorded by the seven vertical long-period seismographs of the UBSO array. Using the power density spectra of the signals and noise segments preceding the signals, signal-to-noise ratios were formed for the simple and phased summations. The simple summation indicated an improvement in signal-to-noise over a single detector of approximately 17 dB at the peak noise frequency of 0.0625 cps for the P-wave signal, but showed little or no improvement for the Rayleigh energy because of the large degree of Rayleigh signal loss. In all three cases the phased summations show improvement for both P and Rayleigh signals; however, the degree of improvement varied from event to event because of the directional properties of the noise sources.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 10, 1970
- Accession Number
- AD0866821
Entities
People
- Don R. Phillips
- John M. Ward
Organizations
- Geotech Instruments (United States)