Personal Narrative Of Travels To The Equinoctial Regions Of America During The Years 1799-1804 - Volume 1 - By Alexander Von Humboldt And Aime Bonpland.
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L'Academie Tome 1 Page 341 On The Earthquake Felt At Paris And Its
Environs In 1681.
) In these different places the ground is
frequently agitated by the most violent shocks; but sometimes, in
the same rock,
The superior strata form invincible obstacles to the
propagation of the motion. Thus, in the mines of Saxony, we have
seen workmen hasten up alarmed by oscillations which were not felt
at the surface of the ground.
If, in regions the most remote from each other, primitive,
secondary, and volcanic rocks, share equally in the convulsive
movements of the globe; we cannot but admit also that within a
space of little extent, certain classes of rocks oppose themselves
to the propagation of the shocks. At Cumana, for instance, before
the great catastrophe of 1797, the earthquakes were felt only along
the southern and calcareous coast of the gulf of Cariaco, as far as
the town of that name; while in the peninsula of Araya, and at the
village of Maniquarez, the ground did not share the same agitation.
But since December 1797, new communications appear to have been
opened in the interior of the globe. The peninsula of Araya is now
not merely subject to the same agitations as the soil of Cumana,
but the promontory of mica-slate, previously free from earthquakes,
has become in its turn a central point of commotion. The earth is
sometimes strongly shaken at the village of Maniquarez, when on the
coast of Cumana the inhabitants enjoy the most perfect
tranquillity.
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