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. 2016 Jun 9;7:11787. doi: 10.1038/ncomms11787

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(a) A(x,t) of a typical front in the positive direction. Right panels are close-ups of A(x,t) in the marked areas. Red arrows denote secondary and tertiary slip-pulses that follow the main slip-pulse which are absent during the earlier (55–75 mm) propagation. (b) (x) (top) and A(x) (bottom) profiles along the interface. Each profile is displayed around x_tip locations coinciding with the strain gauge locations (coloured lines) denoted in a. (c) Close-ups of (x−x_tip) (top) and A(x−x_tip) (bottom) for x_tip=165 mm. We define pulse widths; δ_v is defined from the point where becomes positive (circle), to 2/3 of the difference between maximal and residual values (Methods). δ_A is defined from the point of maximal compression of A(x−x_tip) (circle) to 1/3 of the difference between its residual and minimal values. (d) δ_A versus δ_v for 131 fronts for 2,000<F_N<6,000 N. Colours: locations denoted in a.

Inline graphic — (a) A(x,t) of a typical front in the positive direction. Right panels are close-ups of A(x,t) in the marked areas. Red arrows denote secondary and tertiary slip-pulses that follow the main slip-pulse which are absent during the earlier (55–75 mm) propagation. (b) (x) (top) and A(x) (bottom) profiles along the interface. Each profile is displayed around x_tip locations coinciding with the strain gauge locations (coloured lines) denoted in a. (c) Close-ups of (x−x_tip) (top) and A(x−x_tip) (bottom) for x_tip=165 mm. We define pulse widths; δ_v is defined from the point where becomes positive (circle), to 2/3 of the difference between maximal and residual values (Methods). δ_A is defined from the point of maximal compression of A(x−x_tip) (circle) to 1/3 of the difference between its residual and minimal values. (d) δ_A versus δ_v for 131 fronts for 2,000<F_N<6,000 N. Colours: locations denoted in a.