MAPEAMENTO DE ZONAS SÍSMICAS NO NORTE DE MINAS GERAIS

Abstract

This article aims to map seismic activity and delimit zones with higher frequency and intensity of these events in Northern Minas Gerais. In this region, earthquakes are recurrent, some of them causing significant social and structural impacts, such as the cases recorded in Itacarambi (2007) and Montes Claros (2012–2014). The data analyzed were obtained from the Brazilian Seismographic Network (RSBR), the Seismological Observatory of the University of Brasília (SIS/UnB), and the Seismological Studies Center of Unimontes (NES/Unimontes), covering the period from 1976 to 2024. The epicenters were spatialized in a Geographic Information System environment using ArcGIS 10.5, and the Kernel interpolation technique was applied to calculate seismic density. Based on the results, five main seismic zones were delimited: Montes Claros, Itacarambi, Jaíba, Curral de Dentro, and Riacho dos Machados. The statistical analysis, composed of time series and magnitude distribution, revealed the predominance of low- to moderate-intensity earthquakes, with atypical occurrences such as the 4.9 event in Itacarambi and the 4.2 event in Montes Claros. The results demonstrate the spatial and temporal heterogeneity of regional seismic activity and emphasize the need for continuous monitoring, especially in areas of greater socioeconomic vulnerability. The mapping carried out contributes to advancing seismological studies and to risk management in Northern Minas Gerais, supporting prevention actions and territorial planning.