Accession Number:

AD0773320

Title:

NORSAR Research and Development - 1 July 1972-30 June 1973

Descriptive Note:

Corporate Author:

ROYAL NORWEGIAN COUNCIL FOR SCIENTIFIC AND INDUSTRIAL RESEARCH KJELLER

Personal Author(s):

• Husebye, E. S.

Report Date:

1973-11-01

Pagination or Media Count:

47.0

Abstract:

The report covers the period 1 Jul 1972 - 30 June 1973 which characterized by continuous improvements in event detection and location performance during routine operation of the array. The research efforts were aimed at improving the event detectability, and the potential exploitation of wave scattering effects for improving NORSARs event detection and classification capabilities. Work completed and in progress is presented. The first section deals with seasonal and diurnal noise level fluctuations plus changes in the character of the noise. Next, different types of array beamforming and optimum signal estimation techniques are discussed. The importance of so-called intrinsic time and amplitude anomalies or wave scattering Chernov effects in array data processing are also demonstrated. Finally, work on seismic verification problems is discussed briefly.

Descriptors:

• *SEISMIC DETECTION
• *SEISMOLOGICAL STATIONS
• BEAM STEERING
• DATA PROCESSING
• EARTHQUAKES
• NORWAY
• NUCLEAR EXPLOSIONS
• PERFORMANCE(ENGINEERING)
• SEISMIC ARRAYS
• SEISMOMETERS
• SIGNAL PROCESSING
• SIGNAL TO NOISE RATIO
• UNDERGROUND EXPLOSIONS

Subject Categories:

• Seismology
• Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE