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Figure F4. Multibeam bathymetry projected along the strike of trench offshore Nicoya Peninsula (0 km in projection). Sudden change in trench strike toward Osa Peninsula is interpreted as rapid margin retreat because of accelerated subduction erosion by Cocos Ridge and flanking seamounts. Temperature at plate boundary is shown as isotherms of 60°, 90°, 120°, and 150°C calculated from heat flow probes and depth to the BSR. Red circles = venting sites, where deeply sourced fluids, chemosynthetic carbonates, and fauna have been observed; black circles = earthquakes from Newman et al. (2002), Husen et al. (2003), and DeShon et al. (2003). CRISP = Costa Rica Seismogenesis Project.

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