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DOI | 10.1002/2017GL076421 |
The 2017 Jiuzhaigou Earthquake: A Complicated Event Occurred in a Young Fault System | |
Sun, Jianbao1; Yue, Han2; Shen, Zhengkang2,3; Fang, Lihua4; Zhan, Yan1; Sun, Xiangyu1 | |
2018-03-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:5页码:2230-2240 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | The Minshan Uplift Zone (MUZ) is located at the eastern margin of the Tibetan Plateau, which is the junction of three tectonic terranes. The observed discrepancy between a high uplifting and low shortening rate over the MUZ is attributed to the intrusion of a viscous lower crust. In the last 50 years, several significant earthquakes occurred at the boundaries of the MUZ, that is, the Huya and Mingjiang faults. On 8 August 2017, the Jiuzhaigou earthquake (M-w 6.5) occurred on the northern extension of the Huya fault. We adopt a joint inversion of the interferometric synthetic aperture radar and teleseismic body wave data to investigate the rupture process of this event. The obtained slip model is dominated by left-lateral strike slips on a subvertical fault presenting significant shallow slip deficit. The rupture initiation is composed of both thrust and strike-slip mechanisms producing a non-double-couple solution. We also resolve a secondary fault branch forming an obtuse angle with the main fault plane at its northern end. These phenomena indicate that the northern Huya fault is a young (less mature) fault system. Focal mechanisms of the regional earthquakes demonstrate that the northern and southern Huya faults present different combinations of strike-slip and reversed motion. We attribute such discrepancy to the lateral extension of the viscous lower crust, which appears to extrude to the east beyond the northern Huya fault, in comparison with that confined under the MUZ near the southern Huya fault. This conceptual model is also supported by geomorphological and magnetotelluric observations. Plain Language Summary Earthquake ruptures are controlled by tectonic loading; thus, researching on the earthquake rupture mechanism reflects the tectonic loading mechanism. The Minshan Uplift Zone is located at the eastern margin of the Tibetan Plateau. It is the junction of three tectonic blocks, which presents fast uplift rate and slow shortening rate. Thus, injection of a soft or viscous lower crust may explain this deformation phenomenon. By investigating the 2017 Jiuzhaigou earthquake and the regional earthquakes near the Minshan Uplift Zone, we found that the eastern margin of the Minshan Uplift Zone, so-called the Huya fault, is a young fault system, which presents a high complexity of rupture processes. The sense of motion also varies between the northern and southern Huya faults. These phenomena appear to be related to the difference of the lower crust intrusion. The injection of a soft viscous lower crust leads to the uplift of the whole Minshan Uplift Zone. The boundary of the lower crust intrusion controls the earthquake mechanisms occurred on the boundary of the Minshan Uplift Zone. |
英文关键词 | Jiuzhaigou earthquake joint inversion viscous lower crust Tibetan Plateau Minshan Uplift Zone fault system |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000428402400013 |
WOS关键词 | 2008 WENCHUAN EARTHQUAKE ; COMPLEX BODY WAVES ; LOWER CRUSTAL FLOW ; TIBETAN PLATEAU ; EASTERN MARGIN ; DEFORMATION ; RUPTURE ; CHINA ; MECHANISMS ; INVERSION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27172 |
专题 | 气候变化 |
作者单位 | 1.China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China; 2.Peking Univ, Sch Earth & Space Sci, Beijing, Peoples R China; 3.Univ Calif Los Angeles, Earth Planetary & Space Sci, Los Angeles, CA USA; 4.China Earthquake Adm, Inst Geophys, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Sun, Jianbao,Yue, Han,Shen, Zhengkang,et al. The 2017 Jiuzhaigou Earthquake: A Complicated Event Occurred in a Young Fault System[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(5):2230-2240. |
APA | Sun, Jianbao,Yue, Han,Shen, Zhengkang,Fang, Lihua,Zhan, Yan,&Sun, Xiangyu.(2018).The 2017 Jiuzhaigou Earthquake: A Complicated Event Occurred in a Young Fault System.GEOPHYSICAL RESEARCH LETTERS,45(5),2230-2240. |
MLA | Sun, Jianbao,et al."The 2017 Jiuzhaigou Earthquake: A Complicated Event Occurred in a Young Fault System".GEOPHYSICAL RESEARCH LETTERS 45.5(2018):2230-2240. |
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