Abstract
Brune’s source model is employed to determine the source parameters (stress-drop, seismic moment, peak frequency) and the seismic moment magnitude of the Porto dos Gauchos/MT main shock, occurred on March 10, 1998. The source parameters were determined from the spectral analysis of digital waveforms recorded by seven stations of a regional seismographic network. For all stations were determined displacement spectrum and from those the source parameters. The final values were taken as the average of the results. Three different types of magnitudes are presented: body wave magnitude (mb = 5.1), macrosseismic magnitude (mb = 5.1) and seismic moment magnitude (Mw = 5.2).
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