Accession Number : ADA305835

Title :   The Norwegian Seismic Array (NORSAR). Phase 3.

Descriptive Note : Scientific rept. for 1 Apr-30 Sep 95,

Corporate Author : NORWEGIAN SEISMIC ARRAY (NORSAR) KJELLER

PDF Url : ADA305835

Report Date : NOV 1995

Pagination or Media Count : 172

Abstract : 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 experimental Spitsbergen Regional Array for the period for the period 1 April - 30 September 1995. 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 Experimental Seismic Array (FINESS), the German Experimental Seismic Array (GERESS), the Hagfors array in Sweden and an experimental regional seismic array in Apatity, Russia. The NORSAR Detection Processing system has been operated throughout the period April - August 1995 with an average uptime of 99.1% as compared to 99.6% for the previous six-month period. During September 1995, the NORSAR array was out of continuous operation due to the final refurbishment effort. Backup during this period was provided by the NORESS array, colocated with NORSAR subarray 06C. NORESS continued to be in full operation during the refurbishment work. A total of 2027 seismic events have been reported in the NORSAR monthly seismic bulletin for April - August 1995. The performance of the continuous alarm system and the automatic bulletin transfer to AFTAC has been satisfactory. The system for direct retrieval of NORSAR waveform data through an X.25 connection has been used successfully for acquiring such data by AFTAC. 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 Intelligent Monitoring System (IMS). (AN)

Descriptors :   *SEISMIC DETECTION, *SEISMIC ARRAYS, DATA BASES, ALGORITHMS, SIGNAL PROCESSING, AUTOMATION, DATA MANAGEMENT, INFORMATION TRANSFER, MONITORING, WAVEFORMS, REGRESSION ANALYSIS, SEISMIC DATA, COMMUNICATIONS NETWORKS, INFORMATION RETRIEVAL, SEISMIC WAVES, DATA ACQUISITION, SEISMIC DISCRIMINATION, ONLINE SYSTEMS, EARTHQUAKES, NORWAY, MAGNETIC TAPE, ARCTIC REGIONS, WARNING SYSTEMS, SEISMOLOGICAL STATIONS, SEISMOMETERS.

Subject Categories : Seismology
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE