Figure 9
( a − b )/(∆ μ ss /∆ln V sliding ) plotted against smectite/clay-mineral content for the five samples tested in this study. Values of (a − b) relative to ratio of incremental steady-state friction coefficient to incremental logarithmic sliding velocity (∆μss/∆lnVsliding) are plotted against the content of smectite (squares) or clay minerals (circles).