Frictional properties of the shallow Nankai Trough accretionary sediments dependent on the content of clay minerals

Earth, Planets and Space

Table 3 Summary of experimental conditions and results

Sample	T	P_c(MPa)	P_p(MPa)	V_axial(μm/s)	V_sliding(μm/s)	μ_ss@V_axial = 1µm/s	a − b	∆μ_ss/∆lnV_sliding
C2516	RT	36	28	0.1, 1, 10	0.1155, 1.155, 11.55	0.25	0.0046 Â± 0.0011	0.0127 Â± 0.0013
C2571	RT	37	29	0.1, 1, 10	0.1155, 1.155, 11.55	0.82	0.0073 Â± 0.0026	0.0078 Â± 0.0012
C2652	RT	38	29	0.1, 1, 10	0.1155, 1.155, 11.55	0.53	0.0022 Â± 0.0015	0.0041 Â± 0.0006
C9073	RT	57	43	0.1, 1, 10	0.1155, 1.155, 11.55	0.56	0.0063 Â± 0.0005	0.0103 Â± 0.0007
C9087	RT	57	43	0.1, 1, 10	0.1155, 1.155, 11.55	0.71	0.0040 Â± 0.0012	0.0046 Â± 0.0017

T, temperature; RT, room temperature; P_c, confining pressure; P_p, pore pressure; V_axial, axial displacement rate; V_sliding, sliding velocity; μ_ss, steady-state friction coefficient; a − b, difference in instantaneous and decayed responses after an e-times stepwise change in sliding velocity; ∆μ_ss/∆lnV_sliding, ratio of incremental steady-state friction coefficient to incremental logarithmic sliding velocity. See text for details to determine μ_ss, (a − b), and Δμ_ss/ΔlnV_sliding values.