气候变化领域集成服务门户(CCPortal): Late Quaternary normal faulting along the western boundary fault of Peiku Co graben in southern Nyalam-Coqen rift: Implications for extensional deformation in southern Tibet and seismic hazard

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DOI	10.1016/j.jsg.2024.105087
	Late Quaternary normal faulting along the western boundary fault of Peiku Co graben in southern Nyalam-Coqen rift: Implications for extensional deformation in southern Tibet and seismic hazard
	Gao, Yang; Li, Meng; Wu, Zhonghai; Zhang, Keqi; Zuo, Jiameng; Tian, Tingting; Wang, Shifeng
发表日期	2024
ISSN	0191-8141
EISSN	1873-1201
起始页码	181
卷号	181
英文摘要	The NS-trending rifts play an important role in accommodating E-W extensional deformation in the interior of the Tibetan Plateau. Although -380 km long Nyalam-Coqen rift (NCR) is one of the most prominent rifts in southern Tibet, the late Quaternary fault activity, strong earthquakes and extensional deformation along the NCR remain unknown. Here, we focus on the western boundary fault of Peiku Co graben, Gangpengqing fault (GF), in the southern NCR. We use the vertical offsets obtained from the unmanned aerial vehicle (UAV) digital elevation model (DEM) and published 10Be cosmogenic surface exposure ages to determine the late Quaternary throw rates over different timescales, and combine the trenching record and AMS-C-14 dating to constrain the paleoseismic events. Our results demonstrate that the late Quaternary throw rates along the GF are from 0.4 +/- 0.1 mm/yr to 0.6 +/- 0.1 mm/yr. Combining the throw rates and dip angle of fault, we further estimate the extension rates across the southern NCR, ranging from 0.2 +/- 0.1 mm/yr to 0.4 +/- 0.1 mm/yr. The paleoseismic results suggest that two surface-faulting events occurred on the GF at -13.6-10.8 ka BP and -7-6 ka BP. The elapsed time of > 6 ka since the most recent strong earthquakes (Mw 6-7) implies the potential for occurrence of Mw 6.8 or larger earthquake in the future along the GF. Relative to normal faults in the Yadong-Gulu rift, the GF has the lower throw rate (-0.4-0.6 mm/yr) and longer recurrence interval (less than -6-7 ka) of strong earthquake since -18 ka BP, Moreover, the comparison with published extension rates across other main rifts indicates that the late Quaternary extension rates across different rifts in southern Tibet are not completely consistent. These imply that the extensional deformation and strong earthquake in different rifts in southern Tibet have the distinct difference.
英文关键词	Normal faulting; Extensional deformation; Seismic hazard; Nyalam-coqen rift; Southern Tibet; AMS-C-14 dating
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001222256100001
来源期刊	JOURNAL OF STRUCTURAL GEOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/308747
作者单位	China Geological Survey; Chinese Academy of Geological Sciences; Institute of Geomechanics, Chinese Academy of Geological Sciences; Peking University; Ministry of Natural Resources of the People's Republic of China
推荐引用方式 GB/T 7714	Gao, Yang,Li, Meng,Wu, Zhonghai,et al. Late Quaternary normal faulting along the western boundary fault of Peiku Co graben in southern Nyalam-Coqen rift: Implications for extensional deformation in southern Tibet and seismic hazard[J],2024,181.
APA	Gao, Yang.,Li, Meng.,Wu, Zhonghai.,Zhang, Keqi.,Zuo, Jiameng.,...&Wang, Shifeng.(2024).Late Quaternary normal faulting along the western boundary fault of Peiku Co graben in southern Nyalam-Coqen rift: Implications for extensional deformation in southern Tibet and seismic hazard.JOURNAL OF STRUCTURAL GEOLOGY,181.
MLA	Gao, Yang,et al."Late Quaternary normal faulting along the western boundary fault of Peiku Co graben in southern Nyalam-Coqen rift: Implications for extensional deformation in southern Tibet and seismic hazard".JOURNAL OF STRUCTURAL GEOLOGY 181(2024).