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IV.—On a Possible Cause of the Disturbance of Magnetic Compass-Needles during Earthquakes

Published online by Cambridge University Press:  01 May 2009

Charles Davison
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Extract

From time to time, during earthquake-shocks, magnetic compass-needles within the disturbed areas have been seen suddenly deflected from their position of rest, returning to it shortly, after one or more oscillations. This movement admits of two very different interpretations. Either it may be attributed to an intimate connexion between earthquakes and terrestrial magnetism, or it may be regarded asmerely a consequence of the shock of the earthquake. The object of this note is to point out a possible mechanical cause, and to guard, therefore, against a too hasty assumption of a magnetic origin for these disturbances

Type
Original Articles
Information
Geological Magazine , Volume 2 , Issue 5 , May 1885 , pp. 210 - 211
Copyright
Copyright © Cambridge University Press 1885

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References

page 210 note 1 Mallet, R., Catalogue of recorded Earthquakes, Brit. Assoc. Rep. 1854, p. 18.Google Scholar

page 210 note 2 Ibid. p. 314.

page 211 note 1 Trans. Geol. Soc., second series, vol. v. pt. iii. pp. 602–3.Google Scholar

page 211 note 2 These are the only instances I have been able to find in which the direction of the movement of the compass-needle is stated. Others only mentioning a movement at the instant of the shock are of course much more commonly recorded.