WHEN THE SOIL TREMBLES Aristotle thought that the
sismos were
provoked by air vibrations in the interior of the land, deriving of grottos. E, if today is known that it is a fenómeno provoked for the advance of the existing tectónicas plates in the interior of the land, not yet is obtained to foresee with exactidão when it is that a zone could be afectada by a sismo. Relatively Portugal we know, currently, that if it finds in a
seismic zone but, we cannot foresee when the manifest Nature if. It is certain that terramoto of 1755 was annihilating, was not the only one that it devastated the Country to the long one of the centuries.
Sabe that in the year of 1147 it had a fort I shake, but from
century XIV it only is that more explicit references appear. Throughout this century ten terramotos were registaram: 1321, 1344 and 1356 had been the ones that had more punished Lisbon, having destroyed part of If and some houses. Coimbra also trembled in 1347 and 1355, and in the 1366 and 1395 all Country it felt the soil to tremble but, without consequ
ências. In century XV the zone of the Pacific was afectada, but in century XVI six great sismos had provoked some material victims and estragos. Of 1531, that it shook Lisbon and the remaining portion of Portugal provoked almost as many
estragos as of 1755 and was of equal intensity. Century XVIII was prodigal in destruction. It stops beyond terramoto of 1755, had a fort I shake in 1722 in the Algarve, that it provoked avultados estragos. In the two following centuries Portugal it trembled in 1856,1889,1909 and 1969.
The terramotos annihilating had occurred in continental Portugal but the islands of the Açores had suffered some sismos, throughout the times. This because the archipelago if finds in the junction of the Atlantic seismic
region with the prolongation of the mediterrânica seismic region.
Portugal is not a region properly insurance. Many specialists affirm that if to occur a new sismo she can assume desmedidas ratios, data the studies that if regularly make with respect to this form of the nature if to reveal.
Let us wait that to happen itself, it has efficient forms to skirt this “whim” of the Nature.
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