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TitleMicroseismic noise on Canadian seismograph records in 1962 and station capabilities
AuthorBasham, P W; Whitham, K
SourcePublications of the Dominion Observatory vol. 32, no. 4, 1966, 13 pages, (Open Access)
PublisherCanada Department of Mines and Technical Surveys
Mediapaper; on-line; digital
File formatpdf
ProvinceNova Scotia; Quebec; British Columbia; Ontario; Northwest Territories
AreaLondon; Mould Bay; Resolute Bay; Victoria
Subjectsgeophysics; seismology; earthquakes; seismographs; seismic waves; earthquakes; earthquake magnitudes; epicentres; seismicity
Illustrationstime series; tables; graphs; histograms; geoscientific sketch maps
Released1966 01 01; 2018 10 09
AbstractMeasurements of short- and long-period microseisms from the eight first-order Canadian seismic stations in operation during 1962 are presented. Monthly mean values of specific-hour and daily maximum short- and long-period amplitudes vary considerably from station to station and from season to season. Also presented are cumulative-frequency plots and amplitude-probability levels of specific-hour and daily maximum short-period microseismic amplitudes. Long-period microseismic periods and spectral-peak positions are seen to vary from summer to winter.
Curves are presented illustrating the 90-per-cent and 50-per-cent probability levels of unified-magnitude perceptibility for epicentral distances up to no degrees and the 90-per-cent probability level of local-earthquake magnitude perceptibility for epicentral distances up to 20 degrees. These curves are used to explain an easily demonstrated station variability in teleseism reporting and to assess the theoretical coverage of Canadian seismicity for 1962.