Semiannual Technical Summary.
Summary rept. 1 Apr-30 Sep 98,
ROYAL NORWEGIAN COUNCIL FOR SCIENTIFIC AND INDUSTRIAL RESEARCH KJELLER
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This Semiannual Technical Summary describes the operation, maintenance and research activities at the Norwegian Seismic Array NORSAR the Norwegian Regional Seismic Array NORESS, the Arctic Regional Seismic Array ARCESS and the Spitsbergen Regional Array for the period 1 April - 30 September 1998. Statistics are also presented for additional seismic stations, which through cooperative agreements with institutions in the host countries provide continuous data to the NORSAR Data processing Center NDPC. These stations comprise the Finnish Regional Seismic Array FINESS, the German Regional Seismic Array GERESS, the Hagfors array in Sweden and the regional seismic array in Apatity, Russia. The NORSAR Detection Processing system has been operated throughout the period with an average uptime of 99.77. A total of 2049 seismic events have been reported in the NORSAR monthly seismic bulletin for April through September 1998. The performance of the continuous alarm system and the automatic bulletin transfer to AFTAC has been satisfactory. Processing of requests for full NORSAR and regional array data on magnetic tapes has progressed according to established schedules. This Semiannual Report also presents statistics from operation of the Regional Monitoring System RMS. The RMS has been operated in a limited capacity, with continuous automatic detection and location and with analyst review of selected events of interest for GSBTT-3. Data sources for the RMS have comprised all the regional arrays processed at NORSAR. The Generalized Beamforming GBF program is now used as a pre-processor to RMS. On-line detection processing and data recording at the NORSAR Data Processing Center NDPC of NORESS, ARCESS, FINESS and GERESS data have been conducted throughout the period. Data from two small-aperture arrays at sites in Spitsbergen and Apatity, Kola Peninsula, as well as the Hagfors array in Sweden, have also been recorded and processed.