Prediction of downhole waveforms

摘要: A least-squares linear prediction method using an optimum finite impulse response filter was used to predict a downhole velocity waveform. determined from surface and waveforms several underground nuclear test events at each of locations. Separate filters were for vertical, radial, tangential components. Filters component averaged. Then the measured waveform different event with that event. predicted or simulated compared on The coherence between evaluated normalized mean squared error. applied generated by Pahute Mesa in Yucca Flat. Coherence generally better vertical than radial good surface/downhole pair station Climax granite pluton. It especially poor Rainier Dome Mountain Fortymile Canyon (not true pair) where topographic effects affected horizontal pluton wasmore » found rotate north-south direction regardless whether motion came south (Yucca Flat) west (Pahute Mesa). There is insufficient data date recently installed apply as it other pairs. similarity geology Mesa. Therefore, average one waveform.« less