Accession Number:

ADA002252

Title:

Progress Report NORSAR Phase 3

Descriptive Note:

Quarterly rept. no. 3, 1 Jul-30 Sep 1974

Corporate Author:

ROYAL NORWEGIAN COUNCIL FOR SCIENTIFIC AND INDUSTRIAL RESEARCH KJELLER

Personal Author(s):

• Berteussen, K. A.

Report Date:

1974-10-11

Pagination or Media Count:

23.0

Abstract:

The report covers operation and research activities at the Norwegian Seismic Array NORSAR in the period 1 Jul - 30 September 1974. The performance of the field instrumentation and computer installations has been stable with a normal amount of corrective maintenance. The ARPANET terminal is used routinely for data exchange. In the Event Processor a new program package which will calculate optimal beamforming weights for some selected unclear detections is in progress. In the Detection Processor a floating threshold procedure is in development. In connection with this a study of the seasonal and diurnal noise variance fluctuations and their effect on earthquake detectability has been finished. It has further been shown that the short-periodic seismic noise at NORSAR can be described by autoregressive models.

Descriptors:

• *SEISMIC DETECTION
• *SEISMOLOGICAL STATIONS
• BEAM FORMING
• DATA PROCESSING
• EARTHQUAKES
• MAINTENANCE
• NORWAY
• OPERATION
• SEISMIC ARRAYS
• SEISMOMETERS
• UNDERGROUND EXPLOSIONS

Subject Categories:

• Seismology
• Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE