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Earth, Planets and Space
Figure 3 | Earth, Planets and Space

Figure 3

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

Figure 3

Velocity dependence of friction measured by velocity-step tests. Representative results of the velocity-step tests. (a), (b) Sample U1381A-6R-2 W from Unit I (clay to silty clay) shows positive velocity dependence at V = 0.028 to 2.8 mm/s. (c), (d) Sample U1381A-8R-1 W from Unit II (silicic to calcareous ooze) shows negative velocity dependence at V = 0.028 to 0.28 mm/s and positive velocity dependence at V = 0.28 to 2.8 mm/s. The inset figures show an enlarged plot for the duration of the velocity step. (e) Values of frictional velocity dependence of the tested samples for the range of sliding velocities V = 0.0028 to 2.8 mm/s.

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