You earthquakes they are earthquakes that occur as a result of movement of tectonic plates. The tremors happen because there is a release of energy, as a result of the displacement, which propagates through the surface of the planet as seismic waves.
Seismic activities are more frequent in regions that lie on the edges of tectonic plates. Therefore, it is constantly stated that regions located in the middle of tectonic plates do not have the incidence of earthquakes.
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Brazil is located on the South American plate, far from its edges, but has a history of earthquakes in the country. This fact is explained by the occurrence of geological faults on its surface, causing earthquakes.
geological faultsare ruptures of rocky blocks or strips of the Earth's surface, causing displacement of parts of the surface, of centimeters or kilometers, in a region.
This phenomenon occurs as a result of pressure exerted by tectonic plates. This force exceeds the resistance capacity of the rock layers, causing the surface to break.
In the appearance of faults, the release of energy accumulated until the moment exceeds the resistance and elasticity of the surface strip.
In Brazil there are 48 geological faults, these being the main regions that trigger earthquakes in the country.
The only earthquake that caused deaths in Brazil occurred in 2007 in Minas Gerais, with a magnitude of 4.9.
The magnitude level of earthquakes can vary, with the highest intensity ever hitting the country being 7.6 on the Richter Scale.
See the list of biggest earthquakes that ever hit Brazil.
The earthquake that occupies the first place on the list had its epicenter in Peru, in a forested region of the Amazon, 169 km from the city of Tarauacá, in Acre.
However, seismic waves were felt with intensity in Acre, Rondônia and Manaus. In some regions, such as Rio Branco and Porto Velo, some buildings were evacuated as a security measure.
The earthquake with a magnitude of 7.3 had its epicenter 19 km southeast of Yaguaraparo. However, the seismic waves spread to Brazil, reaching Boa Vista, Rorainópolis, Caracaraí and Pacaraima in Roraima with intensity.
Therefore, security measures were taken and the buildings were evacuated in these regions and in Manaus.
The earthquake had its epicenter located 38 km from Sucre, the capital of Bolivia, and 1082 km from São Gabriel da Cachoeira, a Brazilian municipality that borders Colombia and Venezuela.
The earthquakes were felt in different regions of the Amazon.
The earthquake had its epicenter in Peru, but was propagated and felt in the cities of the interior of Acre and in the state of Amazonas.
The earthquake happened 300 km away from the city of Sucre, in Bolivia, where buildings shook, leaving no injuries. With a magnitude of 6.8, it was also felt in Brazilian cities, such as São Paulo, 2,000 km away from the epicenter. In addition, it reached the Federal District, Minas Gerais, Paraná, Rio Grande do Sul and Santa Catarina.
The tremor was registered 89.1 km from the city of Tarauacá and 400 km from Rio Branco. However, it happened at a depth of 575 km and reached the surface with little intensity.
It is considered as the highest intensity earthquake with the epicenter in a Brazilian state. It happened at a depth of 604 km, 167 km from the city of Tarauacá.
The epicenter was located 100 km from Porto de Gaúchos, 644 km from Cuiabá. As occurred in 1955, the region was sparsely populated and there were no victims.
The epicenter of the earthquake happened 125 km east of Cruzeiro do Sul, a municipality in the interior of Acre. It happened at a depth of 580 km and caused no casualties.
In 1995, Vitória witnessed the aftershocks of an earthquake of magnitude 6.3, with the epicenter located 300 from the sea coast.
Seismic tremors were felt in the States of Amazonas and Acre. The earthquake occurred 165 km away from Cruzeiro do Sul (AC) and 452 km from Rio Branco, at a depth of 632.9 km.
The epicenter occurred 1,277 km off the coast of Natal, in the Atlantic Ocean, at a depth of 9 km. Despite having happened from the ocean, it did not trigger waves that could affect the coast of the state.
See too: The 20 biggest earthquakes in history
