平直断层黏滑及动态破裂扩展的实验研究

doi:10.13722/j.cnki.jrme.2018.0596

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Abstract

Study on the mechanical characteristics of stick-slip and the observation of rupture propagation on faults are in favour of getting insight into the earthquake source process. To mimic natural earthquakes，in this paper，the scheme of laboratory earthquake was performed where the gabbro sample of straight fault was loaded bi-axially. The effect of loading rate in the range of 0.05–0.5 μm/s on the stress strop and recurrence interval of stick-slips was investigated. Based on the ultrahigh speed diagnostic system with digital speckle，the dynamic rupture propagation of the fault was captured. With the digital image correlation(DIC) method，the evolution of the displacement field and the shear stress field was resolved. It is revealed that：(1) the recurrence interval，average stress drop and the dislocation of ruptures increase while the loading rate decreases. (2) There can be more than one nucleation region on the earthquake fault and the observed rupture process consists of the nucleation stage，the slow coalescence stage and the rapid propagation stage where the rupture speed can approach or even exceed the shear wave velocity. (3) The asperities and weak segments on the fault are responsible for the complex of the dynamic rupture propagation process and the heterogeneity of dislocation along the fault trace.

Key words： rock mechanics stick-slip ultrahigh speed diagnostic system dynamic rupture propagation

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	Articles by authors
	DONG Peng1
	XIA Kaiwen1
	GUO Yanshuang2

Cite this article:

DONG Peng1,XIA Kaiwen1,GUO Yanshuang2. Experimental study on stick-slip and dynamic rupture propagation of straight faults[J]. , 2018, 37(S2): 3990-3997.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0596 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/3990

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