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TitleBasic seismology and seismicity of Eastern Canada
AuthorSmith, W E T
SourceDominion Observatory, Seismological Series 1966-2, 1967, 43 pages,
Alt SeriesDominion Observatory, Seismological Series 47
PublisherCanada Department of Energy, Mines and Resources (Ottawa, Canada)
Mediapaper; on-line; digital
File formatpdf
ProvinceNova Scotia; Prince Edward Island; New Brunswick; Quebec; Ontario; Newfoundland and Labrador
NTS1 /NW; 2 /NW; 2 /SW; 3 /SW; 11; 12; 13 /SE; 13 /SW; 20 /NE; 21; 22; 30 /SW; 31; 32; 33 /SE; 33 /SW; 41 /NE; 41 /SE; 42 /NE; 42 /SE; 43 /SE
Subjectsgeophysics; earthquakes; epicentres; p waves; s waves; seismological network; Cornwall Massena Earthquke; St. Lawrence Earthquake; Timiskaming Earthquake
Illustrationslocation maps; graphs; seismograms; schematic representations; tables; diagrams; geoscientific sketch maps
Released1967 01 01; 2018 11 13
AbstractIn 1928 seismographs capable of detecting the smaller shocks, within a radius of 200-300 miles, were installed in Canada along the St. Lawrence River. Since then, the seismic network has been expanded to more than 20 stations. By 1968 no part of Canada will be more than about 300 miles from a sensitive seismograph. Seismograph records have accurate time scales making it possible to locate the source of an earthquake quite precisely. The instruments are carefully calibrated so that a measure of trace amplitude determines the earthquake's size on the instrumental magnitude scale. A relationship between intensity and magnitude developed for the earthquakes of California has been found to hold reasonably well for Canadian earthquakes. This is of particular importance in the interpretation of the earthquake catalogues of eastern Canada and adjacent areas. The catalogues are published as Vol. 26, No. 5 and Vol. 32, No. 3 of the Publications of the Dominion Observatory, Ottawa. The first contains the seismic history to the end of 192 7 and rates the shocks by maximum intensity. The second is an instrumental study of the earthquakes from 1928 to 1959 and rates the shocks by magnitude. Through the relationship of maximum intensity to magnitude a fairly consistent ranking, according to size, has been possible. Using the relationship of acceleration to intensity, the data can be used as the basis of more sophisticated seismicity studies.