Publisher's Synopsis
Excerpt from Earthquakes and Other Earth Movements
These comprise Earthquakes, or the sudden violent movements of the ground Earth Tremors, or minute move ments 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.
It is difficult to separate these Earth Movements from each other, because they are phenomena which only differ in degree, and which are intimately associated in their occurrence and in their origin.
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