High-resolution velocity structure and seismogenic potential of strong earthquakes in the Bamei-Kangding segment of the Xianshuihe fault zone

doi:10.1007/s11430-022-1133-y

IOCAS-IR > 海洋地质与环境重点实验室

	High-resolution velocity structure and seismogenic potential of strong earthquakes in the Bamei-Kangding segment of the Xianshuihe fault zone
	Zhao, Yan1 ; Li, Junlun 1,2,3; Xu, Jian 1; Yao, Huajian 1,2,3; Zhu, Gaohua 4; Yang, Hongfeng 5; Zhang, Jinyu 6; Lu, Renqi 6
	2023-09-01
发表期刊	SCIENCE CHINA-EARTH SCIENCES
ISSN	1674-7313
卷号	66 期号:9 页码:1960-1978
通讯作者	Li, Junlun(lijunlun@ustc.edu.cn) ; Yao, Huajian(hjyao@ustc.edu.cn)
摘要	On September 5, 2022, a strong M(S)6.8 earthquake struck the Luding area in the Kangding-Moxi segment of the Xianshuihe fault zone, which is the northern boundary of the Sichuan-Yunnan rhombic block, causing considerable casualties. The Bamei-Kangding segment of the Xianshuihe fault zone, which is located only tens of kilometers away from the Luding earthquake, has hosted frequent moderate to strong earthquakes in history and is a dangerous earthquake-prone zone. Therefore, it is critical to investigate the regional seismogenic environment for strong earthquakes and to evaluate the impact of the Luding earthquake in this area. For this purpose, we deployed a dense seismic array comprising over 200 short-period nodes in this region from July to August, 2022 and acquired seismic ambient noise for over 30 days. Using the collected data, we conducted surface wave tomography and obtained a high-resolution 3-D shear wave velocity model for the regional shallow crust down to 8 km in depth. The key findings include: (1) the Bamei-Kangding segment of the Xianshuihe fault zone exhibits widespread stripped low-velocity anomalies, suggesting shear movements at a relatively high temperature of the Xianshuihe fault zone; the Zheduoshan granitic pluton situated between the Zheduotang and southern Selaha faults shows a distinct low-velocity anomaly, which may be attributed to the localized high-temperature anomaly resulted by a deep magmatic heat source and the recent rapid uplift of the Zheduoshan area; (2) a ten-kilometer-wide high velocity body found below 4 km in depth near the Zhonggu area in the Bamei segment coincides with the seismic gap of moderate to strong earthquakes in this region, suggesting that the high velocity body may act as a seismic barrier; (3) the heterogeneity of the velocity structure along the Bamei-Kangding segment of the Xianshuihe fault zone corresponds to the regional changes in temperature, which reveals the reason for the spatially varying seismogenic potential in this segment; especially, the Selaha and Zheduotang faults which are located along the boundaries between the high and low velocity anomalies may possess considerable seismogenic potential; (4) the Coulomb failure stress calculations indicate that the Luding earthquake has imposed nontrivial stress loading in the Bamei-Kangding segment, and may shorten the earthquake recurrence intervals of the southern Selaha fault, the Zheduotang fault, and the Xuemenkan segment of the Xianshuihe fault zone. Thus, the Luding earthquake may potentially pose threats to the Sichuan-Xizang railway passing through this region.
关键词	Xianshuihe fault zone Bamei-Kangding segment Luding earthquake Dense-array ambient noise tomography Seismogenic environment for moderate to strong earthquakes
DOI	10.1007/s11430-022-1133-y
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Project of China[2021YFC3000602] ; Special Fund of Key Laboratory of Earthquake Prediction, CEA[2021IEF0103]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001054228400004
出版者	SCIENCE PRESS
WOS关键词	COULOMB STRESS EVOLUTION ; SURFACE-WAVE DISPERSION ; TIBETAN PLATEAU ; WESTERN SICHUAN ; SEISMIC HAZARD ; EASTERN MARGIN ; UPPER-MANTLE ; SOUTHEASTERN PART ; SOUTHWEST CHINA ; ACTIVE FAULT
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/182883
专题	海洋地质与环境重点实验室
通讯作者	Li, Junlun; Yao, Huajian
作者单位	1.Univ Sci & Technol China, Sch Earth & Space Sci, Lab Seismol & Phys Earths Interior, Hefei 230026, Peoples R China 2.Univ Sci & Technol China, Mengcheng Natl Geophys Observ, Hefei 230026, Peoples R China 3.CAS Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China 4.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 5.Chinese Univ Hong Kong, Fac Sci, Earth Syst Sci Programme, Hong Kong 999077, Peoples R China 6.China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Yan,Li, Junlun,Xu, Jian,et al. High-resolution velocity structure and seismogenic potential of strong earthquakes in the Bamei-Kangding segment of the Xianshuihe fault zone[J]. SCIENCE CHINA-EARTH SCIENCES,2023,66(9):1960-1978.
APA	Zhao, Yan.,Li, Junlun.,Xu, Jian.,Yao, Huajian.,Zhu, Gaohua.,...&Lu, Renqi.(2023).High-resolution velocity structure and seismogenic potential of strong earthquakes in the Bamei-Kangding segment of the Xianshuihe fault zone.SCIENCE CHINA-EARTH SCIENCES,66(9),1960-1978.
MLA	Zhao, Yan,et al."High-resolution velocity structure and seismogenic potential of strong earthquakes in the Bamei-Kangding segment of the Xianshuihe fault zone".SCIENCE CHINA-EARTH SCIENCES 66.9(2023):1960-1978.