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The Origin of Earthquakes as illustrated by their Periodicity

Published online by Cambridge University Press:  01 May 2009

Charles Davison
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Extract

SOME recent studies on the periodicity of earthquakes have thrown light on their origin and especially on that of their attendant after-shocks. The periods that are of most service for this purpose are the solar periods of one year and one day, the lunar periods of 29·6 and 14·8 days, and the period of 42 minutes due to the throbbing of the earth in consequence of the crustal displacement that gives rise to the earthquake. As a rule, the maximum epoch of the annual period falls either in midwinter or in midsummer, that of the diurnal period about midnight or noon, that of the period of 29·6 days close to the times of either new and full moon, that of the period of 14·8 days at or about the times of new and full moon or of first and last quarter, and that of the 42 minute period either with the return movements after their passage to the antipodes and back or half-way between these returns.

Type
Original Articles
Information
Geological Magazine , Volume 71 , Issue 11 , November 1934 , pp. 493 - 500
Copyright
Copyright © Cambridge University Press 1934

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References

page 493 note 1 (1) “The Annual Periodicity of Earthquakes,” Amer. Seis. Soc. Bull., xviii, 1928, 246–266;Google Scholar

page 493 note 2 (2) “The Diurnal Periodicity of Earthquakes,” Journ. of Geol., xlii, 1934, 449–468;Google Scholar

page 493 note 3 (3) “The Lunar Periodicities of Earthquakes,” Phil. Mag., xvii, 1934, 737–752;Google Scholar

page 493 note 4 (4) “The 42 minute Period in the Frequency of the After-shocks of Earthquakes,” Amer. Seis. Soc. Bull., xxiii, 1933, 57–79.Google Scholar

page 495 note 1 Rep. Brit. Ass., 1928, 241–304.Google Scholar

page 495 note 2 Japan Seis. Journ., iv, 1895, 1–367.Google Scholar

page 495 note 3 Imp. Earthq. Inv. Com. Bull., ii, 1908, 58–88.Google Scholar

page 496 note 1 Rep. Brit. Ass., 1911, 649–740.Google Scholar

page 497 note 1 Imamura, A. and Hasegawa, K., Imp. Earthq. Inv. Com. Bull., xi, 1928, 64–92; T. Yasuda, Imp. Earthq. Inc. Com. Publ. (Jap.), No. 100 A, 1925, 261–310.Google Scholar

page 499 note 1 Imp. Earthq. Inv. Com. Publ., No. 25, 1930, 49–69.Google Scholar

page 500 note 1 Earthq. Res. Inst. Bull., xi, 1933, 639–692.Google Scholar

page 500 note 2 Earthq. Res. Inst. Bull, vi, 1929, 245–331; vii, 1929, 133–152.Google Scholar