Seismic Data Analysis Center

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)...

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Bibliographic Details
Main Author: Hartenberger, Royal A
Other Authors: TELEDYNE GEOTECH ALEXANDRIA VA SEISMIC DATA ANALYSIS CENTER
Format: Text
Language:English
Published: 1976
Subjects:
Seismology
Computer Programming and Software
Computer Systems
*SEISMIC ARRAYS
*SEISMIC DATA
ALASKA
BATCH PROCESSING
CHINA
COMPUTER PROGRAMS
DISCRIMINATION
EARTHQUAKES
EPICENTERS
INFORMATION RETRIEVAL
KAMCHATKA PENINSULA
NETWORKS
NORWAY
NUCLEAR EXPLOSIONS
RAYLEIGH WAVES
REAL TIME
SEISMIC DETECTION
SEISMIC SIGNATURES
SEISMOLOGICAL STATIONS
UNDERGROUND EXPLOSIONS
UNITED STATES
*Vela project
Tibet
Amchitka
Kamchatka Peninsula
Norway
Kamchatka
Alaska
Online Access:http://www.dtic.mil/docs/citations/ADA040301
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA040301
Description
Summary: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.

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