Figure 2
From: Feasibility of acoustic monitoring of strength drop precursory to earthquake occurrence
Simulated histories. (Left) Simulated histories of the slider displacement δ (top), the slider velocity normalized by the load point velocity V/V∗ (middle), the state Φ and the shear stress τ (bottom) for the the Nagata RSF, where Φ∗ and τ∗ are reference values from steady-state sliding at V∗. (Right) Simulated histories for 2 years prior to instability at t=0. From Figure Five b and Figure Six b in Kame et al. (2012a). Adopted RFS parameters (a,b,c,L)=(0.051,0.0565,2.0,0.033 m) and simulation parameters (V∗,σ,k/k c ,ν)=(1.4×10−9 m/s,100 MPa,0.90,8.8×10−5 m/s/MPa), where σ is the normal stress, k/k c is the ratio of the spring stiffness to the critical stiffness and ν is the coefficient of the radiation damping term.