Figure F4. Seismicity along Costa Rica margin. Small black circles show seismicity recorded by Sismologica Nacional (RSN) in the period 1992–2007. Focal mechanisms correspond to large earthquakes (Mw > 6.4) nucleated in the seismogenic zone over the past 25 y. Red circles show aftershocks from the 2002 Osa event, and beige circles show aftershocks from the 1999 Quepos event (Modified from Arroyo et al., 2011).
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