Estimation of rupture speed for the 1995 m(l)4. 1 shacheng, hebei, china, earthquake sequence based on the minimum radiation energy criterion
文献类型：期刊论文
| 作者 | Liu Bo-Yan; Shi Bao-Ping |
| 刊名 | Chinese journal of geophysics-chinese edition
 |
| 出版日期 | 2008-11-01 |
| 卷号 | 51期号:6页码:1797-1803 |
| 关键词 | Overshoot Partial stress drop Crack extending Seismic radiation energy Fracture energy Minimum radiated energy constraint (mrec) |
| ISSN号 | 0001-5733 |
| 通讯作者 | Liu bo-yan(liuboyan06@mails.gucas.ac.cn) |
| 英文摘要 | From variational principle, we have derived the minimum radiation energy criterion (mrec), and use it in the earthquake source dynamics study. for the 1995 m(l) 4. 1 shacheng heibei earthquake sequence, we come to the conclusion that the dynamic rupture processes of main shock and aftershocks are totally different: the rupture speed of the m(l) 4. 1 main shock is about 0.89 of shear wave speed, closing to the rayleigh wave speed, while the rupture speeds of the remained 28 aftershocks range from 0.05 to 0.55 of shear wave speed, which is much smaller than shear wave speed. in addition, based on the circular crack extending model, we also calculate the seismic radiation efficiencies for this earthquake sequence, and the results indicate that, for most aftershocks, the radiation efficiencies are less than 10%, inferring a low seismic efficiency. in our study, we suggest that the dynamic rupture processes of these aftershocks could be related to the crack (sub-fault) extension inside the main fault, rather than the simple momentum of the moving block, which has been commonly assumed in the fault frictional motion if an overshoot occurs during earthquake rupture. the local stress concentrations inside the fault after main shock may play an important role in sustaining the crack extension. therefore, the fracturing process associated with the crack extension for the aftershock becomes a main energy dissipation mechanism. compared with the m(l) 4. 1 main shock. we also find that there exists an essential difference in the earthquake energy partition for the aftershock source dynamics. in other words. the fracture energy dissipation could not be ignored in the source parameter estimation for the earthquake faulting especially for small earthquakes. otherwise. the radiated seismic energy could be overestimated or underestimated. |
| WOS关键词 | STRESS-DROP ; APPARENT STRESS ; PARAMETERS ; SPECTRA |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000261313500020 |
| 出版者 | SCIENCE PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2390006 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Liu Bo-Yan |
| 作者单位 | Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu Bo-Yan,Shi Bao-Ping. Estimation of rupture speed for the 1995 m(l)4. 1 shacheng, hebei, china, earthquake sequence based on the minimum radiation energy criterion[J]. Chinese journal of geophysics-chinese edition,2008,51(6):1797-1803. |
| APA | Liu Bo-Yan,&Shi Bao-Ping.(2008).Estimation of rupture speed for the 1995 m(l)4. 1 shacheng, hebei, china, earthquake sequence based on the minimum radiation energy criterion.Chinese journal of geophysics-chinese edition,51(6),1797-1803. |
| MLA | Liu Bo-Yan,et al."Estimation of rupture speed for the 1995 m(l)4. 1 shacheng, hebei, china, earthquake sequence based on the minimum radiation energy criterion".Chinese journal of geophysics-chinese edition 51.6(2008):1797-1803. |
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来源：中国科学院大学
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