Of earth-quakes. Chapter 56.
FOrasmuch as the earth is not only heauy by nature, but euen the heauiest of all elements, and is heaped vp and compacted together in the midst of the great vniuersall world, as the point and center thereof, it therefore followeth that it is immooueable, and without any naturall motion. For if it had any, as the other elements haue, it is certaine, that it must bee downewards. But because that God hath placed the earth in the midst of all his workes, towards which all heauy things tende and descend; it cannot descend lower then it is by the nature thereof. And therefore because it is solide and thicke, and not liquide and fluent as the water and the aire, it cannot glide as they doe, nor remooue out of one place into another, if it bee not by some violence else∣where mooued and made to stirre, and tremble somewhere, as it hath happened through diuers and maruellous earthquakes, of which histories and the holy scripture it selfe doe giue euidence. Wee must note then, that there are diuers sorts of motions, by which the earth is so shaken, that it lifteth and casteth some parts, sometimes vpwards, sometimes downewards. And it is long of such motions and tremblings, that there haue such masses * 1.1 and heapes beene cast out of it, that great isles haue beene newely made, ar Geo∣graphers doe witnesse, namely the isle of Rhodes, and of Selos. It sometimes also happe∣neth, that the motions of the earth bee such, that it openeth like a great gulph, wherein to some parts thereof are cleane swallowed vp and deuoured, together with the countries, and twones scituate therein; so that there hath beene no marke left of them, no more then as if they had neuer beene. And it hath often hapned in such cases, that some mountaines haue fallen one against another, because the earth, which was betwixt them hath suncke, and beene swallowed cleane vp. And then one might say, that the prouerbe is not euer true, which saith, that two mountaines neuer meete. That is yet another kinde of motion, wher∣in the earth mooueth and shaketh, sometimes one way, sometimes another way, and tot∣tereth like a ship that floateth on the water. VVhich kinde of trembling is most dangerous as also when all the motion runneth one way. Then is there yet another motion, which philosophers properly call (trembling) to wit, when two motions are opposite one to ano∣ther. And this is least daungerous of all: although indeede they bee all very fearefull, yet the feare is much greater, when the tremblings continue with horrible and fearefull sounds like the bellowing of buls, and as if the earth and all nature quaked and groaned, beeing sore pressed and forced, as is oftentimes seene.
Now for the causes of all these kindes of earthquakes, I may well say, that there is no point in all naturall philosophie, wherein the professors of this science finde themselues * 1.2 more intricately intangled, nor wherein they more differ in opinions then in this. For the Chaldeans and Astronomers referre the causes of motions and earthquakes, to the hea∣uen, to starres, and to the planets, and many philosophers assigne it to the water: And yet those which are of this opinion differ amongst themselues. For some suppose that the earth floateth vpon the water like a ship because it is enuironed with water, according to the na∣turall order of the disposition of the elements: whereby it is diuersly mooued. Others do attribute the cause of earth quakes to those waters onely which are inclosed within the vaines and caues of the earth. Some also to the fire: and some to the windes shut vp within it: and some to the heate chased by the cold, which striueth against it, and causeth it to search an issue out. For as the water vndermineth the earth, and those places through which it doth passe: euen so may the fire doe: and if either of them be so enclosed, that they cannot finde an easie issue, they striue then to doe it by force and violence. So doe the windes, and the heate chased by the cold. So then, if the earth by vndermined, it is no maruell if the vpper part sinke and fall downe, being swallowed vp, as into a gulphe, consi∣dering that the earth, because of the heauinesse thereof, tendeth alwaies downeward towards the center thereof, which is the midst of it, and of all the world. And if the wa∣ters, or the fire or the windes inclosed and shut vp in the earth, or the contrary qualities, which contend one with another, cannot finde a passage or issue, their power is so great,