The Norwegian Seismic Array (NORSAR)
Abstract
The operation and some of the research activities at the Norwegian Seismic Array (NORSAR) are described in this report, covering the period 1 April to 30 September 1980. Compared with the previous reporting period a decrease in the operation performance of the NORSAR online DP system is observed, from 83.7% uptime to 71.1% this period, with the SPS as the main source of trouble, accounting for 90% of the downtime. A new IBM 4331 computer was installed in the beginning of the period, and the load of the old 360 B-computer has gradually decreased as programs have been implemented on the new computer. Apart from communication faults caused by thunderstorms the communication system performance has been satisfactory. A new line in the ARPA network, via Germany to SDAC, was established in July but was not considered quite reliable as of the end of this reporting period. Enlargement of NORSAR Experimental Small-Aperture Subarray (NORESS) up to twelve seismometer sites as initiated (completed 31 October 1980). An experiment undertaken by Teledyne-Geotech testing an event detector based on the Walsh theory utilizing a North Star microprocessor and three of the NORSAR SP channels was started. The test period is planned to last out this calendar year. Digital recording of five stations from the Southern Norway Seismic Network (SNSN) was initiated in August.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1980
- Accession Number
- ADA112156
Entities
People
- Alf Kr. Nilsen
Organizations
- Royal Norwegian Council for Scientific and Industrial Research