th we get an earthquake attended by wind,Adam Clendening Tröjor. Only these earthquakes are less severe because their source and cause is divided.
Again, most earthquakes and the severest occur at night or, if by day,Patrick Marleau Tröjor, about noon, that being generally the calmest part of the day. For when the sun exerts its full power (as it does about noon) it shuts the evaporation into the earth. Night,Tyler Johnson Tröjor, too, is calmer than day. The absence of the sun makes the evaporation return into the earth like a sort of ebb tide,Justin Abdelkader Tröjor, corresponding to the outward flow; especially towards dawn, for the winds,Andreas Martinsen Tröjor, as a rule,CG Menn Chateau Parka, begin to blow then,Blake Wheeler Tröjor, and if their source changes about like the Euripus and flows inwards the quantity of wind in the earth is greater and a more violent earthquake results.
The severest earthquakes take place where the sea is full of currents or the earth spongy and cavernous: so they occur near the Hellespont and in Achaea and Sicily,Alex Delvecchio Tröjor, and those parts of Euboea which correspond to our description-where the sea is supposed to flow in channels below the earth. The hot springs, too, near Aedepsus are due to a cause of this kind. It is the confined character of these places that makes them so liable to earthquakes. A great and therefore violent wind is developed,Dame Moncler Gene, which would naturally blow away from the earth: but the onrush of the sea in a great mass thrusts it back into the earth. The countries that are spongy below the surface are exposed to earthquakes because they have room for so much wind.
For the same reason earthquakes usually take place in spring and autumn and in times of wet and of drought-because these are the windiest seasons. Summer with its heat and winter with its frost cause calm: winter is too cold, summer too dry for winds to form. In time of drought the air is full of wind; drought is just the predominance of the dry over the moist evaporation. Again,Logan Brown Tröjor, excessive rain causes more of the evaporation to form in the earth. Then this secretion is shut up in a narrow compass and forced into a smaller space by the water that fills the cavities. Thus a great wind is compressed into a smaller space and so gets the upper hand, and then breaks out and beats against the earth and shakes it violently.
We must suppose the action of the wind in the earth to be analogous to the tremors and throbbings caused in us by the force of the wind contained in our bodies. Thus some earthquakes are a sort of tremor, others a sort of throbbing. Again,Jared Spurgeon Tröjor, we must think of an earthquake as something like the tremor that often runs through the body after passing water as the wind returns inwards from without in one volume.
The force wind can have may be gathered not only from what happens in the air (where one might suppose that it owed its power to produce such effects to its volume), but also from what is observed in animal bodies. Tetanus and spasms are motions of wind,Shea Weber Tröjor, and their force is such that the united efforts of many men do not succeed in overcoming the movements of the patients. We must suppose, then (to compare great things with small), that what happens in
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