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Earth, Planets and Space
Figure 1 | Earth, Planets and Space

Figure 1

From: Frictional properties of sediments entering the Costa Rica subduction zone offshore the Osa Peninsula: implications for fault slip in shallow subduction zones

Figure 1

Topographic and bathymetric map of the Costa Rica area and Hole U1381A summary. (a) Topographic and bathymetric map of the Costa Rica area (Marine Geoscience Data System, MGDS; http://www.marine-geo.org; Ryan et al. 2009). The tectonic setting and major elements on the map are after Barckhausen et al. (2001). EPR, East Pacific Rise crust; CNS, Cocos-Nazca Spreading Center crust. Seismic event locations (stars) are from Arroyo et al. (2009). (b) Summary of the lithostratigraphy (after Expedition 334 Scientists 2012). Red arrows show the depth intervals of the core samples from which the experimental samples were taken. Sample 7R-2 W shows both white and black parts: the white part (7R-2 W white) can be classified in the silicic to calcareous ooze group, and the black part (7R-2 W black) in the tephra group.

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