Stick-slip and strain waves in the physics of earthquake rupture: experiments and models |
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| Authors: | Victor G Bykov |
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| Institution: | (1) Institute of Tectonics and Geophysics, Far Eastern Branch of the Russian Academy of Sciences, Khabarovsk, Russia |
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| Abstract: | The study of stick-slip is directly connected with the formulation of the consistent concept of seismicity migration and explanation
of the nature of strain waves observed at the contacts of blocks and plates. We propose a phenomenological model to describe
the initiation of stick-slip at the rough contact of blocks of rocks. The model contains the leading factors of stick-slip
process (friction, roughness of contact surfaces, and asperity). The model reproduces the universal profile of slip velocity
and displacement, velocity of dynamic rupture observed in experiments. The stick-slip motion at a rough surface of a fault
is shown to be a nonlinear process and can be described by the generalized sine-Gordon equation.
The results of calculations and a comparison with experimental data testify to the existence of waves of a new type — solitary
waves of sliding. The analogies are found between the strain waves generated due to stick-slip at the contact of the blocks
of rocks, strain waves in the crustal faults, and those within the lithosphere. |
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| Keywords: | stick-slip strain waves earthquake rupture autowave processes |
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