Evolution of the Areado/MG seismic sequence - started in January, 2004

A microearthquake seismic sequence, in course in the neighborhoods of the little Town of Areado, located in the southern part of Minas Gerais State is studied. This sequence started on January 21, with a 3.4 regional magnitude felt with a MMI V. After that, a local seismograph network with up to six stations detected more than nine hundred microearthquakes, 458 of these located using data of at least three components stations. A composite focal mechanism indicates a dextral transcurrent fault in NNE-SSW direction, in accordance with a hypocentral distribution of the microearthquakes. Results of preliminary studies of that sequence were presented in the first Symposium of the Brazilian Geophysical Society (SBGf) occurred in São Paulo in September 2004. In these studies, it was presented the analysis results of the data generated by the seismic network from January 28 to May 28. This paper intends to update the results presented on 2004 SBGf Symposium, in a more conclusive way, showing seismicity and evolution from January 28, 2004 to May 28, 2005.