While the aboriginal population was decimated for strange illnesses to the local people or for the violence of the conquerors the new white population if concentrated generally next to the coast in reduced nuclei. Still today the country lives a spaced occupation sufficiently and many places are unexplored or the population is small, the access is difficult and the information of these towns rare obtains hearing in the great centers. In these places one I shake seismic can not be perceived by nobody or for very few inhabitants and not to gain register, thus, this phenomenon officially does not exist. Another factor to be considered deals with what we know as tectnica plate. The last century it was given credit that the plates would not present imperfections, idea this falling of trees recently with the advent of modern instruments as the radars that make possible the discovery of that the plates present ruptures in its interior that these recent imperfections in seismic geologic terms present movement what cause abalos. 3 STRUCTURE OF the PLATE South-AMERICANANosso knowledge on what it is a tectnica plate moved.
New technologies have in them proportionate a knowledge much more deepened of the subject and knocked down old ideas for our astonishment and concern. Using tip technology we discover that the South American plate where Brazil if finds in its center, is not inteiria, presents all to the 48 imperfections in its interior due to the consuming occurred for the time and that these ruptures were sensible to the accumulation of pressure, therefore endowed with movements. Although its small movement either, is enough to generate earthquakes less despite the frequency either than in other more active parts of globo.3.1 DIVISION TECTNICA BRASILEIRASegundo information of ' ' Tectnico map of the Brasil' ' , created for the Federal University of Minas Gerais, the analyses of topographical and geologic maps show that the regions that present the greater number of imperfections is the Southeast and the Northeast, followed for the North and Center-West, and, finally, the Northeast Sul.O is the region that more suffers with seismic abalos.