Accession Number : AD0783181

Title :   NORSAR Location Calibrations and Time Delay Corrections.

Descriptive Note : Scientific rept. on Phase 3,

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

Personal Author(s) : Berteussen,K. A.

Report Date : 03 JAN 1974

Pagination or Media Count : 46

Abstract : Deviations from theoretical expected values are observed both for slowness and travel time for P-signals crossing the array. These observed anomalies are presented. At NORSAR these are corrected for both when performing beamforming and when locating events. The method used is explained and the effect of these corrections both on signal detectability and event location is shown to be quite profound. Some simple crust models, plane dipping Moho and a Moho which is a curved interface, are tested and found to be able to explain as a maximum 25% of the observed squared deviations. (Author)

Descriptors :   *Seismic detection, *Underground explosions, Seismological stations, Norway, Seismic arrays, Earthquakes, Nuclear explosions, Anomalies, Corrections, Earth mantle, Interfaces, Calibration, Least squares method

Subject Categories : Seismology
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE