LARGE-ARRAY SIGNAL AND NOISE ANALYSIS; TRAVELTIME ANALYSIS FOR LASA
Special scientific rept. no. 15
TEXAS INSTRUMENTS INC DALLAS SCIENCE SERVICE DIV
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The report investigates practical aspects of generating high- resolution wavenumber spectra using subarray outputs of the Montana LASA. Especially studied are the variability of traveltime anomalies as a function of wavenumber, spectral window effect on crosspower estimates due to moveout across the array, and tradeoffs involved in a finite-length transform of array data. From this investigation, it is concluded that current data are insufficient to define a scheme adequately to correct wavenumber spectra calculations for traveltime anomalies. Also, because subarrays on the E and F rings of LASA generally exhibit larger traveltime residuals and less waveform similarity than do subarrays of the inner rings, subarrays on the E and F rings will not be included in high-resolution f-k spectra calculations.