The author gives a systematic account of various Earth Movements.
These comprise Earthquakes, or the sudden violent movements of the
ground; Earth Tremors, or minute movements which escape our
attention by the smallness of their amplitude; Earth Pulsations, or
movements which are overlooked on account of the length of their
period; and lastly, Earth Oscillations, or movements of long period
and large amplitude which attract so much attention from their
geological importance.
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