Experiments with Chirp Filtering of Surface Waves
BERGEN UNIV (NORWAY) SEISMOLOGICAL OBSERVATORY
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In connection with the application of linear chirp filters to dispersed surface wave trains recorded at LASA, Montana, a number of events from the SinoSoviet region have been examined in order to determine the predictability of the time of the maximum filter output. The group velocities thus obtained were compared with the group velocities determined by an analyst using ordinary dispersion analysis. On the basis of the scatter in group velocities found, arrival time windows for surface waves from various regions are given. Dispersion analysis has shown that the assumption of a linear frequency variation in surface waves is not always satisfactory. Therefore, we have allowed for non-linear frequency variation in the chirp filters, and some applications of such filters are demonstrated.
- Seismic Detection and Detectors