Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010geoji.180..697n&link_type=abstract
Geophysical Journal International, Volume 180, Issue 4, pp. 697-702.
Astronomy and Astrophysics
Astronomy
13
Fracture And Flow, Friction, Earthquake Dynamics, Dynamics And Mechanics Of Faulting
Scientific paper
Stick-slip dynamic instability is a key mechanism governing frictional processes from microscale physics to earthquake faults and landslides; yet challenging questions are still open about its nucleation and propagation dynamics. Here we present novel observations on laboratory experimental faults where spontaneously nucleating fractures are produced, describing (1) an initial quasistatic, stable rupture front (propagating at about 5 per cent the shear wave velocity VS), accelerating to subshear and then to intersonic velocity; (2) the arisal of a higher degree of complexity when the friction to prestress ratio is increased on the sliding surface. The complex behaviour includes stop and go sequences, irregular propagation and rerupturing episodes within short-time intervals, implying rapid restrengthening of the surface and the formation of self-healing pulses, reproducing experimentally for the first time a behaviour observed on seismic faults.
Nielsen Stefan
Taddeucci Jacopo
Vinciguerra Sergio
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