期刊
GEOPHYSICAL RESEARCH LETTERS
卷 40, 期 19, 页码 5064-5069出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50974
关键词
nucleation; laboratory earthquake; slow slip; rupture dynamics
资金
- CNRS-INSU
- French Ministry of Foreign Affairs
- French Agence Nationale de la Recherche [ANR-2011-BS56-017]
We observe the nucleation phase of in-plane ruptures in the laboratory. We show that the nucleation is composed of two distinct phases, a quasi-static and an acceleration stage, followed by dynamic propagation. We propose an empirical model which describes the rupture length evolution: The quasi-static phase is described by an exponential growth while the acceleration phase is described by an inverse power law of time. The transition from quasi-static to accelerating rupture is related to the critical nucleation length, which scales inversely with normal stress in accordance with theoretical predictions, and to a critical surfacic power, which may be an intrinsic property of the interface. Finally, we discuss these results in the frame of previous studies and propose a scaling up to natural earthquake dimensions.
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