Semi-Annual technical rept. No. 4, (Part B), 1 Nov 1974-30 Apr 1975
TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
Pagination or Media Count:
It is shown that the complex cepstrum technique is most effective when simple signals are removed from the observed waveform in the order of their arrival. Cepstrum analysis of teleseismic short-period P-waves from fifteen presumed peaceful nuclear explosions in Eurasia suggests that nine contained more than one direct phase. This may indicate the possible multiple explosions or may well be just due to the surface reverberations. Five of these events contained presumed depth phases of amplitude roughly twice that of the direct phase. It is conjectured that some form of surface focusing the up-going energy or restricted propagation of the direct phase might be responsible for this fact. Delay time as found by the cepstrum analysis of the same event at two stations are in satisfactory agreement, although the corresponding amplitude differs somewhat.
- Seismic Detection and Detectors