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Studies on the Periodicity of Earthquakes

Nature volume 142, page 689 (15 October 1938) | Download Citation



“When the earth's crust, or a portion of it, is on the point of making one of those sudden movements that result in earthquakes, a very slight force acting in the same direction may precipitate the movement. On the other hand, the same type of force acting in the opposite direction may be sufficient to delay its occurrence. If the magnitude of the force, in whichever direction it acts, is subject to a periodic variation, as in annual or diurnal changes of barometric pressure, the same, or a contrary, periodic variation may thus be impressed on the frequency of earthquakes in any district. The study of the periodicity of earthquakes may therefore throw light on both small and great movements of the crust...”

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