In order to improve signal-to-noise ratios in the data, Elena Shoshitaishvili, who graduated from the U of A with a Ph.D. in Reflection Seismology, developed a new approach to harmonic noise removal that avoids some of the deleterious effects of simple notch filtering.  (This work is the subject of a manuscript submitted to Geophysics).  Notch filtering, which works well for eliminating a single problem frequency, is not effective on data that contain multiple problem frequencies.  Elena used a time-domain-based method of automatic estimation of noise frequencies and their amplitudes, followed by subtraction of these estimated anomalous harmonics from the data.  Filtering reflection data from the northern CD-ROM transect across Archean and Proterozoic terranes in southern Wyoming and northern Colorado in this way significantly improved data quality even in areas where first breaks were completely obscured by noise.  New analyses of the improved first breaks from CD-ROM multicomponent reflection data have provided more accurate near-surface velocity models which have led to better estimates of rock properties based on P- and S-wave arrivals.  This filtering also improved our ability to correlate the seismic data with geological exposures and now is providing more robust three-dimensional information about deeper events.