Accession Number : AD0766543

Title :   Progress Report NORSAR Phase 3.

Descriptive Note : Quarterly rept. no. 1, 1 Jan-31 Mar 73,

Corporate Author : ROYAL NORWEGIAN COUNCIL FOR SCIENTIFIC AND INDUSTRIAL RESEARCH KJELLER

Personal Author(s) : Husebye,E. S.

Report Date : 15 MAY 1973

Pagination or Media Count : 22

Abstract : The report covers the period 1 January - 31 March 1973 which is characterized by improving, estimating and simulating the array detection capability. The task of connecting NORSAR (Norwegian Seismic Array) to the socalled ARPANET is in progress. The event reporting capability was significantly better in this reporting period than in the corresponding period in 1972. The potential of using amplitude weights in the array beamforming has been investigated and a gain in SNR amounting to 4-6 dB for 8 randomly selected very weak events in Central Asia was achieved. Event magnitudes as reported by NORSAR are similar to those of NOAA (National Oceanic and Atmospheric Administration) for small events (m sub b approximately 4.0) but below NOAA for relatively large events. (Modified author abstract)

Descriptors :   (*SEISMOLOGICAL STATIONS, *NORWAY), (*UNDERGROUND EXPLOSIONS, DETECTION), OPERATION, DATA PROCESSING, NUCLEAR EXPLOSIONS, NETWORKS, EARTHQUAKES

Subject Categories : Seismology
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE