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Quakes in the Interior of São Paulo Reveal Little-Known Geological Faults: What Geologists Say
In recent months, residents of cities in the interior of São Paulo have reported a series of small tremors that have caused concern in local communities. Although the region is not considered an active seismic zone, experts from UNESP have confirmed that the seismic events are related to the presence of ancient geological faults that cross the São Paulo underground.
Recent Records of Quakes and the Affected Municipalities
Among the most notable episodes are the tremors felt in the cities of Iguape and Itariri, in the Ribeira Valley region. In May 2023, residents reported feeling vibrations in houses and buildings. The Geological Service of Brazil (SGB) recorded magnitudes between 2.1 and 3.2 on the Richter scale.
Although considered light, these tremors drew attention due to their frequency and the fact that they occurred in an area that does not typically appear on national seismic risk maps.
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Geology Explains: Brazil Also Shakes
According to geologist Paulo César Brito from UNESP, “the Brazilian territory is situated on a relatively stable tectonic plate, but that does not mean there cannot be internal rearrangements and active faults in local zones.”
He highlights that these faults, such as the Cubatão Fault and other smaller structures present in the interior of São Paulo, are formed by accumulated tensions over thousands of years. When there is a release of energy, tremors occur.
Importance of Seismic Monitoring
Currently, the Brazilian Seismographic Network (RSBR) monitors seismic events in the country through stations in various states. However, there are still geographic coverage gaps in areas like the Ribeira Valley, which hinders precise detection of more subtle tremors.
Professor Brito emphasizes that “it is essential to invest in more measurement equipment and expand the seismographic station network, especially in areas that are now showing activity.”
Is There Risk to the Population?
According to experts, the recent tremors do not represent structural risk for buildings nor a direct threat to the population. However, the repeated occurrence of quakes can generate social apprehension and raises the need for contingency plans for unexpected events.
Additionally, it is important to consider that geological faults can also affect subterranean infrastructure projects, such as gas pipelines, water supply networks, and transportation tunnels.
Phenomenon Also Occurs in Other Parts of Brazil
The interior of São Paulo is not an isolated case. In recent years, cities like João Câmara (RN), Caruaru (PE), and Corumbá (MS) have also recorded tremors associated with local geological faults. According to the Ministry of Mines and Energy, over 200 low-magnitude earthquakes are recorded annually in Brazil.
Science and Prevention Go Hand in Hand
The study of geological faults and seismic movements is essential to guide public policies on urbanization, civil construction, and civil protection. With advancements in technology, it is possible to detect microtremors that are almost imperceptible to humans, which helps in creating a more detailed and reliable seismic map.
“With information, we can avoid panic and act preventively,” concludes Brito.
Article produced based on scientific sources and real statements.
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