MICROSEISMIC NOISE ON CANADIAN SEISMOGRAPH RECORDS IN 1962 AND STATION CAPABILITIES.
ARCTIC INST OF NORTH AMERICA MONTREAL (QUEBEC)
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Measurements 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 season to season. Cumulative frequency plots and amplitude probability levels of specific hour and daily maximum short-period microseismic amplitudes are presented. 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 110 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 used to assess the theoretical coverage of Canadian seismicity in 1962. Author