Norwegian Seismic Array (NORSAR) Phase 3

This report covers research and operation activities at the Norwegian Seismic Array (NORSAR) for the period 1 January - 30 June 1976. In this reporting period the operation of the Detection Processor System (DP) has been interrupted by a number of stops that are larger than usual, while the Event Pr...

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Bibliographic Details
Main Author: Berteussen, K A
Other Authors: ROYAL NORWEGIAN COUNCIL FOR SCIENTIFIC AND INDUSTRIAL RESEARCH KJELLER
Format: Text
Language:English
Published: 1976
Subjects:
Computer Systems
Seismic Detection and Detectors
*DATA PROCESSING
*NORWAY
*SEISMIC ARRAYS
EARTH MANTLE
MAINTENANCE
MONITORS
NETWORKS
ONLINE SYSTEMS
PATTERN RECOGNITION
REAL TIME
SEISMIC DETECTION
NETWORK MONITORS
EURASIA
ANGLE OF INCIDENCE
Jan Mayen
Jan Mayen Fracture Zone
Norway
Online Access:http://www.dtic.mil/docs/citations/ADA030047
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA030047
Description
Summary:This report covers research and operation activities at the Norwegian Seismic Array (NORSAR) for the period 1 January - 30 June 1976. In this reporting period the operation of the Detection Processor System (DP) has been interrupted by a number of stops that are larger than usual, while the Event Processor has performed satisfactorily. Project personnel have increased their participation in maintenance on some of the special equipment. From the beginning of the period the NORSAR DP on-line system has exchanged 2.4K bit/sec of real data over the ARPANET. The total number of events reported is higher than usual, with a daily average of 22.2. There are no changes in the monitoring schedule, but towards the end of the period the array monitoring was hampered by EOC (Experimental Operations Console) faults and a DP fault restricting the use of the EOC. Seven reports/papers and one program have been finished in the period. Altogether 8 topics are covered in the summary of research activities. In the first study it is shown how the discrimination problem may be solved by a pattern recognition approach. Then comes a section about inversion of large apperature array travel time data for mapping of seismic anomalies in the lithosphere-asthenosphere. A study of lateral variations in the structure of the upper mantle beneath Eurasia as well as a direct measurement of the crustal P- velocity in the NORSAR area, using the angle of incidence of long period P-waves has been finished. A detailed investigation of the precursors to the ScS-phase has been initiated, and the seismicity of the area around the presently active part of the Jan-Mayen fracture zone has been re-examined.

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