NON-STATIONARY FILTER DESIGN AND APPLICATION FOR PROCESSING OF SEISMIC SIGNALS

摘要

A method of designing and applying filters for geophysical time series data comprising obtaining a plurality of spatially related geophysical time series and transforming the time series using a wavelet transformation (Fig. 6). The wavelet transformation coefficients (1-16) may be organized into a plurality of subband traces (Fig. 5). The method includes modifying one or more transform coefficients within a plurality of the subband traces or within all but one of the subbands of traces and then inverting the subband traces using an inverse transform to produce a filtered version of the transformed portion of the geophysical time series. The method allows for design and analysis of non-stationary filters (Fig. 4) and filter parameters in untransformed data space. Non-stationary signals may be filtered in all or in windowed portions of the geophysical time series data.