1. A method of signal matching for seismic signals containing a time analog response to reflection of seismic energy from an earth structure, the time analog response for the earth structure having a differing, non-linearly related time base in the signals, comprising: (a) storing first and second seismic signals that have been generated as a time analog response to a source of seismic energy transmitted into the earth and reflected by earth structure; (b) processing said first and second seismic signals to correlate the time analog response to the same earth structure and deriving optimal match curve data that relates the time base of the first seismic signal to the time base of the second seismic signal over the time range of said first and second seismic signals; (c) converting the first and second seismic signals as a function of the optimal match curve data to estimate an output parameter data signal descriptive of a combined property of said first and second seismic signals to time analog responses from the same earth structure at differing time bases; and (d) displaying said output parameter data signal to generate a visual display of the time and magnitude of the output parameter data signal.