Current Effort

During the past year we have systematically scanned the November-March Berkeley vertical component Sprengnether seismograms for the winters of 1962 through 1991 and also the November-March Berkeley vertical component Wilip-Galitzin seismograms for the winters of 1930 through 1964 for a total of $\sim $10,000 seismograms.

Figure 13.24: A comparison of: A) the scanned BKS Sprengnether Z-component seismogram; B) the corresponding digitized waveform, and; C) the corresponding waveform synthesized from the co-sited Streckeisen STS-1 broad band seismograph. The seismic signal is from a M 5.7 teleseism which occurred 4000 km SE of Berkeley (1991/09/18,09:48:13; 14.65N, 90.99W) in Guatemala. All three plots are at the same scale with the horizontal axis spanning 511.25 seconds and the vertical axis spanning 175 mm. That all three waveforms are highly similar is verification of the accuracy of the digitization procedure and the accuracy of the Sprengnether transfer function.
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Berkeley Seismological Laboratory
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