Fault parameters of the 2012 Sumatra earthquake estimated from GRACE gravity and gravity gradient changes
文献类型：期刊论文
| 作者 | Zheng ZengJi5; Jin ShuangGen5; Fan LiHong1 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2019 |
| 卷号 | 62期号:11页码:4129 |
| 关键词 | M-W 8.6 ANDAMAN EARTHQUAKE SATELLITE GRAVITY CONSTRAINTS DISLOCATION SURFACE GRACE PSO algorithm Sumatra earthquake Fault parameters |
| ISSN号 | 0001-5733 |
| 英文摘要 | The M-w = 8. 6 earthquakes occurred on 11 April 2012 and ruptured off the west coast of northern Sumatra. The fault slip models of the earthquake were estimated from different data, but have large differences in the strike-slip nature of faults. GRACE-derived co-seismic gravity changes cover the epicenter area, which can provide good constraint on the fault parameters inversion. In this paper, co-seismic gravity and gradient changes of the 2012 Sumatra earthquake are extracted from GRACE time-variable gravity field and the superiority of the northward component is presented. The theoretical calculation results of the fault model are compared with the GRACE and the sensitivity of the T-xx (north-to-north gravity gradient) to the fault parameters is analyzed. Finally, the fault parameters of the earthquake are retrieved based on the particle swarm optimization (PSO) algorithm and the Okubo dislocation model. The results show that the GRACE-observed co-seismic gravity and gravity gradient changes are in good agreement with the model-estimated results in spatial pattern, but have difference in amplitudes. The strip errors can be substantially suppressed by the north components of gravity and gravity gradients changes, where the noise level of g, (north gravity change) and T-xy are the lowest, followed by T-xz (northto-up gravity gradient) and the worst is the T-xy (north-to-east gravity gradient). The T. is not sensitive to the depth of the fault, but sensitive to other fault parameters. The GRACE-inverted strike angle, dip angle, rake angle and average slip magnitude of the earthquake are 113. 63 degrees , 89. 99 degrees , 175. 26 degrees and 28. 18 m, respectively, indicating a moment-magnitude M-w = 8. 71. In addition, the GRACE-inverted rake angle shows that the earthquake is dominated by the right-lateral strike-slip. |
| 语种 | 英语 |
| 源URL | [http://210.72.145.45/handle/361003/13642]  |
| 专题 | 中国科学院国家授时中心 |
| 作者单位 | 1.中国科学院国家授时中心 2.南京大学 3.中国科学院地球环境研究所 4.中国科学院大学 5.中国科学院国家天文台 |
| 推荐引用方式 GB/T 7714 | Zheng ZengJi,Jin ShuangGen,Fan LiHong. Fault parameters of the 2012 Sumatra earthquake estimated from GRACE gravity and gravity gradient changes[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2019,62(11):4129. |
| APA | Zheng ZengJi,Jin ShuangGen,&Fan LiHong.(2019).Fault parameters of the 2012 Sumatra earthquake estimated from GRACE gravity and gravity gradient changes.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,62(11),4129. |
| MLA | Zheng ZengJi,et al."Fault parameters of the 2012 Sumatra earthquake estimated from GRACE gravity and gravity gradient changes".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 62.11(2019):4129. |
入库方式： OAI收割
来源：国家授时中心
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