Seismic data analysis center. Final techical report
The Alexandria Laboratories Division of Teledyne Geotech operated the Seismic Data Analysis Center (SDAC) during the fifteen (15) month period beginning 1 July 1975 and ending 30 September 1976. The objectives of the work were (1) to operate, program, and maintain real-time and batch processors; (2) to provide services to other government agencies and VELA participants; (3) to conduct research in seismology; and (4) to develop systems to control and process seismic inforamtion generated by remote stations in the Expanded VELA Seismic Network. Scientists completed 18 technical reports, 10 technical memoranda and two special reports on various subjects in seismology. The more important scientific results produced by these studies are: the determination that the Norwegian Seismic Array contains many redundant sensors; the conclusion that the difference between magnitude based on S waves and magnitude based on Rayleigh waves is a discriminant between worldwide earthquakes and underground explosions at NTS and Amchitka; the confirmation that the Ms versus mb source discriminant fails for certain earthquakes in Tibet; the observation that both simple and complex earthquakes originate within small areas on the Kamchatka Penninsula; the hypothesis that differences in attenuation account for the differences in teleseismic event magnitude observed in the western and eastern United States and a study which supports the hypothesis using data from several underground nuclear explosions. In the area of network development, a new software system was installed which detects amplitudes above a prescribed level on seismograms recorded by the VELA network.
- Research Organization:
- Teledyne Geotech, Alexandria, VA (USA). Seismic Data Lab.
- DOE Contract Number:
- F08606-76-C-0004
- OSTI ID:
- 7214574
- Report Number(s):
- AD-A-040301; SDAC-TR-76-13
- Country of Publication:
- United States
- Language:
- English
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