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This report describes the development of a new theory and methodologies for source studies and the results of applications of various time series analysis methods to seismological analyses of interest in nuclear monitoring. Applying the algorithms and ideas of multi-channel deconvolution to regional Pn and Lg arrivals showed that the concept of signal factorability, decomposition of seismogram spectra into site and source factors, is valid for such data. This enables one to investigate various possible applications using inter-event and inter-sensor transfer functions to detect variations in the locations, source mechanisms, source time functions and azimuths of regional sources. Such techniques make use of the details of regional waveforms and circumvent the problems associated with the extreme variability and unpredictability of regional waveforms and the virtual impossibility of computing realistic Greens's functions theoretically. (edc)