Array Research Analysis of K-Line Wavenumber Spectra from the TFO Long Noise Sample
TEXAS INSTRUMENTS INC DALLAS SCIENCE SERVICE DIV
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This report contains the analysis of 1-dimensional wavenumber spectra obtained from a 20-min ambient seismic noise recording at a Tonto Forest Seismological Observatory crossarray. The history and past processing of this noise sample, known as the TFO long noise sample, have been reported in three previous reports. The 1-dimensional wavenumber spectra presented in this report are physically interpreted as projections of 2-dimensional power density spectra squared onto perpendicular axes which are parallel to the two arms of the crossarray at TFO. Thus, these new wavenumber spectra give the power density of the ambient seismic noise as a function of its apparent wavenumber along each of the two arms of the array. Although knowledge of the spectral projections onto two perpendicular lines is basically inferior to knowing the 2-dimensional spectrum itself, the exceptionally high resolution of these K-line spectra allows a much finer analysis of the TFO long noise sample than could be done before using only the low resolution 2-dimensional spectra.