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We study source parameters of a cluster of 21 very shallow (<1?km depth) small-magnitude (M ?<?2) earthquakes induced by percolation of water by gravity in SE Brazil. Using a multiple empirical Green's functions (meGf) approach, we estimate seismic moments, corner frequencies and static stress drops of these events by inversion of their spectral ratios. For the studied magnitude range (-0.3?<?M ?<?1.9), we found an increase of stress drop with seismic moment.
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