Comparison of PIDC and IDC Event Bulletins
Abstract
We compare event lists and bulletins between March 7 and July 6, 2000 of the International Data Centre (IDC) of the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO PrepCom) in Vienna and of the Prototype International Data Centre (PIDC) operated at the Center for Monitoring Research (CMR), Arlington, VA. Automatic events lists and reviewed bulletins of the PIDC and IDC show good overall agreement for this period. Differences in automatic event lists, which appear somewhat larger than the previous period, February 20-March 6, can be related to differences in data available at the two data centers and linked directly to a few discrepancies in software configurations. The daily variation of difference in data availability correlates, as expected, with the degree to which daily automatic bulletins of the two data centers match. The matched events of the automatic event lists depend strongly on the number of defining phases, ndef. For the whole period the percentage of matched events is over 90% for ndef larger than five. Hydroacoustic and infrasonic associated automatic arrival data had, compared with seismic data, very high matching rates, which, however, were based on a small number of observations. The agreement of the REBs, compared for 35 data days during the period, showed a slight increase compared with the previous period with about 80% matched events. The consistent scanning at the PIDC of all REB data days during this period, as opposed to the previous period, could have contributed to the improvement. About 25% of the events that were unique to one of the data centers in the two REBs were also built from SEL3 events that were unique to that data center. Another 25% of the unique events were added in the analyst review. A large portion of the added events, in particular those added by the IDC (55%), depended, however, on phases added in the analyst review to meet the minimum event definition criteria of the REB. The rem
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2000
- Accession Number
- ADA531053
Entities
People
- Hans Israelsson
Organizations
- Defense Threat Reduction Agency