Slow slip and the transition from fast to slow fronts in the rupture of frictional interfaces.

Abstract:

:The failure of the population of microjunctions forming the frictional interface between two solids is central to fields ranging from biomechanics to seismology. This failure is mediated by the propagation along the interface of various types of rupture fronts, covering a wide range of velocities. Among them are the so-called slow fronts, which are recently discovered fronts much slower than the materials' sound speeds. Despite intense modeling activity, the mechanisms underlying slow fronts remain elusive. Here, we introduce a multiscale model capable of reproducing both the transition from fast to slow fronts in a single rupture event and the short-time slip dynamics observed in recent experiments. We identify slow slip immediately following the arrest of a fast front as a phenomenon sufficient for the front to propagate further at a much slower pace. Whether slow fronts are actually observed is controlled both by the interfacial stresses and by the width of the local distribution of forces among microjunctions. Our results show that slow fronts are qualitatively different from faster fronts. Because the transition from fast to slow fronts is potentially as generic as slow slip, we anticipate that it might occur in the wide range of systems in which slow slip has been reported, including seismic faults.

authors

Trømborg JK,Sveinsson HA,Scheibert J,Thøgersen K,Amundsen DS,Malthe-Sørenssen A

doi

10.1073/pnas.1321752111

subject

Has Abstract

pub_date

2014-06-17 00:00:00

pages

8764-9

issue

24

eissn

0027-8424

issn

1091-6490

pii

1321752111

journal_volume

111

pub_type

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