title: Triggered dynamics in a model of different fault creep regimes.
abstract: The study is focused on the effect of transient external force induced by a passing seismic wave on fault motion in different creep regimes. Displacement along the fault is represented by the movement of a spring-block model, whereby the uniform and oscillatory motion correspond to the fault dynamics in post-seismic and inter-seismic creep regime, respectively. The effect of the external force is introduced as a change of block acceleration in the form of a sine wave scaled by an exponential pulse. Model dynamics is examined for variable parameters of the induced acceleration changes in reference to periodic oscillations of the unperturbed system above the supercritical Hopf bifurcation curve. The analysis indicates the occurrence of weak irregular oscillations if external force acts in the post-seismic creep regime. When fault motion is exposed to external force in the inter-seismic creep regime, one finds the transition to quasiperiodic- or chaos-like motion, which we attribute to the precursory creep regime and seismic motion, respectively. If the triggered acceleration changes are of longer duration, a reverse transition from inter-seismic to post-seismic creep regime is detected on a larger time scale.
authors: Department of Geology, University of Belgrade, Faculty of Mining and Geology, Serbia.
authors: Srđan
authors: S
authors: Kostić
authors: Scientific Computing Lab., Institute of Physics, University of Belgrade, PO Box 68, 11080 Beograd-Zemun, Serbia.
authors: Igor
authors: I
authors: Franović
authors: 1] Department of Physics, Faculty of Natural Sciences and Mathematics, University of Maribor, Slovenia [2] Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia.
authors: Matjaž
authors: M
authors: Perc
authors: Department of Applied Mathematics, University of Belgrade, Faculty of Mining and Geology, Serbia.
authors: Nebojša
authors: N
authors: Vasović
authors: Department of Physics and Mathematics, University of Belgrade, Faculty of Pharmacy, Serbia.
authors: Kristina
authors: K
authors: Todorović