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Published online by Cambridge University Press: 01 May 2009
Earthquake-shocks have generally been divided into three classes:
a. Undulatory shocks, by far the most commonly felt, consisting of one or several waves, the movement at any place being to and fro along a line inclined to the horizon, but in general nearly horizontal.
b. “Sussultatore” shocks, consisting of one or more up-and-down movements, in a nearly vertical direction.
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page 260 note 3 If a disturbance take place at any point of a homogeneous and isotropic solid, two spherical waves will diverge from that point with unequal velocities. In the first every particle moves approximately along a line joining it to the centre of disturbance, and the corresponding wave is said to consist of direct vibrations. In the second the particles vibrate in planes perpendicular to the lines joining them to the centre of disturbance, and are said to execute transverse vibrations.
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