Well's First Principles of Geology: a Textbook for Schools, Academies And ...

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Well's First Principles of Geology: a Textbook for Schools, Academies And ...
David Ames Wells
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*^ These waves sometimes manifest themselves as mere tremblings of tlie earth ; at other times, the groimd undulates like the sea. OccasiouallT- a sudden upward motion is communicated to it, and when waves, advancing in opposite directions, cross each other, a rotary or whirling motion is produced.
Earthquakes of the two latter kinds are the most destructive.
The undulations vary in height fipom an inch or two, to several feet TVhen theu" height is considerable very remarkable effects are produ
...ced. During the terrible earthquake whidi destroyed Calabria, in Southern Italy, in 1783, iarge tracts of land were conveyed from their orighial position to distances of more than half a mile. Humboldt mentions that, on one occasion, furni- ture was carried from one place and buried in another, and some persons were thrown across a river to a considerable height upon an opposite moun> tain.
Tho velocity of an earthquake's wave varies, according to the substance Questions.— What are earthquakes f Are earthquakes more to be apprehended than volcanic eruptions f Is the occurrence of earthquakes limited to volcanic districts 1 What is the nature of an earthquake shock?


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