Accession Number : AD0870768

Title :   Horizontal Array Response of Several Wavenumber Analysis Methods.

Descriptive Note : Seismic data lab. rept.,

Corporate Author : TELEDYNE INDUSTRIES INC ALEXANDRIA VA EARTH SCIENCES DIV

Personal Author(s) : Galat, George ; Sax, Robert

Report Date : 05 DEC 1969

Pagination or Media Count : 43

Abstract : In the report the performance of a small array as regards detection and identification of signals in frequency-wavenumber space is evaluated. A two dimensional array is phased to form a one-dimensional array oriented in the direction of simulated signals. Signal discrimination is tested by varying the amplitude, velocity, frequency content and back azimuth of these generated signals. Illustrations of f-k and k(x), and k(y) spectra plots show that, using a small array, neither the standard nor the high resolution frequency-wavenumber analysis can successfully detect small P-waves in ambient P-wave noise. It is concluded that current f-k analysis techniques when used on data from small arrays can easily produce misleading results. (Author)

Descriptors :   (*SEISMOLOGICAL STATIONS, NOISE), (*UNDERGROUND EXPLOSIONS, DETECTION), SEISMOMETERS, PHASED ARRAYS, POWER SPECTRA, SEISMIC WAVES, IDENTIFICATION, SAMPLING, EARTHQUAKES, RESOLUTION, NUCLEAR EXPLOSIONS, SIMULATION.

Subject Categories : Seismology
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE