By BRUCE A. BOLT (Eds.)
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The coherence data in Fig. , the distance between the sensors for which the coherence is measured is 1 km. 0 H z range, which varies from about 35 km to 4 km. A s a consequence, this coherence is a measure of the ratio of propagating to total noise power, as pointed out in Section IV, C. In addition, as the spatial lag increases the coherence tends to decrease due to the finite extent in wavenumber space of the frequency-wavenumber spectrum of the noise, as shown in Fig. 11a and b. Thus, it is seen from Fig.
14. It should be pointed out that the beating, or modulation, in the envelope of the wave trains depicted in this figure is typical of that observed for Rayleigh waves due to the multipath propagation, as discussed by Pilant and Knopoff (1964). The results obtained for the processing of the Rayleigh waves of this event using the high-resolution method are shown in Fig. 15 for the 25-sec period group. It is seen from Fig. 15a that during the first 200-sec time interval following the arrival time of the Rayleigh wave, there is a 25-sec period group arriving at L A S A from an azimuth of 301 deg, where the true azimuth of the event is indicated as 312 deg.
The digital convolutional filter is applied to the data in the usual way to obtain the filtered output signal. B . S H O R T - P E R I O D S I G N A L PROCESSING RESULTS W e now present the signal processing results in the S P case. The response of the S P Z seismometer system is shown in Fig. 4. 5 2 5 FREQUENCY (Hz) FIG. 4. Short-period system transfer function. 0 H z band. This band was found to contain the predominant P-wave signal energy. S. Coast and Geodetic Survey. The horizontal phase velocity of the Ρ wave can then be obtained by using standard seismological tables for the appropriate epicenter-to-LASA distance.
Geophysics by BRUCE A. BOLT (Eds.)