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Seismic activity from magnitude 5.0 in region of South America (close to Chile-Illapel) during September 2015. (a) Map of EQs in September 2015 in the neighborhood of Chile-Illapel. (b) Plot of EQs with respect to mainshock. Magenta stems denote EQ magnitude multiplied by 10, brown stems denote hypocenter depth. Source of subfigure (a) and data: USGS.
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