Determination of the Focal Mechanisms of Events in Brazil Central

In this paper we present the results of the Focal Mechanisms (FM) determination for four weak events from the Goiás-Tocantins Seismic Zone (GTSZ) using the method of Cyclic Scanning of the Polarity Solutions (CSPS), such method makes use of the full waveform inversion to constrain the non-unique focal mechanism solutions, obtained by the FOCMEC program, from a set of few available polarities only. The solution reliability is controlled by a series of quality control parameters. The events occurred in the Brazil Central region, close to the cities of Mara Rosa/GO (2010), Formoso/GO (2011), Aliança/TO (2011) and Peixe/TO (2015).