Knowledge Management System of Institue of Mechanics, CAS
| Weak Zone Related Seismic Cycles in Progressive Failure Leading to Collapse in Brittle Crust | |
Tang CA(唐春安) ; Huang ML(黄明利); Zhao XD(赵兴东); Tang, CA (reprint author), Northeastern Univ, CRISR, Shenyang 110006, Liaoning, Peoples R China.
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| Source Publication | Pure and Applied Geophysics
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| 2003 | |
| Volume | 160Issue:12Pages:2319-2328 |
| ISSN | 0033-4553 |
| Abstract | Until quite recently our understanding of the basic mechanical process responsible for earthquakes and faulting was not well known. It can be argued that this was partly a consequence of the complex nature of fracture in crust and in part because evidence of brittle phenomena in the natural laboratory of the earth is often obliterated or obscured by other geological processes. While it is well understood that the spatial and temporal complexity of earthquakes and the fault structures emerge from geometrical and material built-in heterogeneities, one important open question is how the shearing becomes localized into a band of intense fractures. Here the authors address these questions through a numerical approach of a tectonic plate by considering rockmass heterogeneity both in microscopic scale and in mesoscopic scale. Numerical simulations of the progressive failure leading to collapse under long-range slow driving forces in the far-field show earthquake-like rupture behavior. $En Echelon$ crack-arrays are reproduced in the numerical simulation. It is demonstrated that the underlying fracturing induced acoustic emissions (or seismic events) display self-organized criticality------from disorder to order. The seismic cycles and the geometric structures of the fracture faces, which are found greatly depending on the material heterogeneity (especially on the macroscopic scale), agree with that observed experimentally in real brittle materials. It is concluded that in order to predict a main shock, one must have extremely detailed knowledge on very minor features of the earth's crust far from the place where the earthquake originated. If correct, the model proposed here seemingly provides an explanation as to why earthquakes to date are not predicted so successfully. The reason is not that the authors do not understand earthquake mechanisms very well but that they still know little about our earth's crust. |
| Subject Area | 力学 |
| DOI | 10.1007/s00024-003-2394-0 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000186320800006 |
| WOS Keyword | NUMERICAL-SIMULATION ; ROCK FAILURE ; SELF-ORGANIZATION ; ENERGY-RELEASE ; FRACTURE ; EARTHQUAKES ; BEHAVIOR ; DYNAMICS ; DAMAGE |
| WOS Research Area | Geochemistry & Geophysics |
| WOS Subject | Geochemistry & Geophysics |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/17025 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | Tang, CA (reprint author), Northeastern Univ, CRISR, Shenyang 110006, Liaoning, Peoples R China. |
| Recommended Citation GB/T 7714 | Tang CA,Huang ML,Zhao XD,et al. Weak Zone Related Seismic Cycles in Progressive Failure Leading to Collapse in Brittle Crust[J]. Pure and Applied Geophysics,2003,160,12,:2319-2328. |
| APA | 唐春安,黄明利,赵兴东,&Tang, CA .(2003).Weak Zone Related Seismic Cycles in Progressive Failure Leading to Collapse in Brittle Crust.Pure and Applied Geophysics,160(12),2319-2328. |
| MLA | 唐春安,et al."Weak Zone Related Seismic Cycles in Progressive Failure Leading to Collapse in Brittle Crust".Pure and Applied Geophysics 160.12(2003):2319-2328. |
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