气候变化领域集成服务门户(CCPortal): Bifurcated Crustal Channel Flow and Seismogenic Structures of Intraplate Earthquakes in Western Yunnan, China as Revealed by Three-Dimensional Magnetotelluric Imaging

CCPortal

DOI	10.1029/2019JB018991
	Bifurcated Crustal Channel Flow and Seismogenic Structures of Intraplate Earthquakes in Western Yunnan, China as Revealed by Three-Dimensional Magnetotelluric Imaging
	Ye T.; Chen X.; Huang Q.; Zhao L.; Zhang Y.; Uyeshima M.
发表日期	2020
ISSN	21699313
卷号	125 期号:9
英文摘要	Based on broadband magnetotelluric data collected in western Yunnan, we obtain a three-dimensional crustal resistivity model, which reveals seismogenic structures of Yingjiang and Longling earthquakes. Our model suggests a bifurcation of the crustal flow in western Yunnan, with a southwestern branch running into the Tengchong Block north of the Dayingjiang Fault and a southeastern branch flowing into the Baoshan Block. The Yingjiang region features an upper and midcrustal resistive body above 20-km depth, surrounded by conductors in the midcrust. Six moderate earthquakes in Yingjiang occurred in the transition zone between the resistive and conductive structures. These earthquakes occurred in the context of a right-lateral accommodation zone between the Nabang and Binglangjiang Faults and in the presence of the southwestern branch of the crustal flow, which provides a mechanical decoupling under the rigid high-resistive upper crust. Beneath the Longling area, a high-resistive structure extends through the entire crust, but a zone of low resistivity is embedded in the depth range of 10–25 km where the 1976 M7.3 earthquake occurred. The high-resistive body provides a blockage to the previously proposed crustal channel flow along the Gaoligong shear zone and may accumulate sufficient stress. The Longling strong earthquakes may result from the sinistral strike-slip motion of the Ruili-Luxi Fault in the framework of the north to northeast trending compressive stress. The blockage to the crustal channel flow along the Gaoligong shear zone by the high-resistivity zone in Longling could be an important factor to produce the north to northeast trending compressive stress field in Longling area. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	inversion; magnetotelluric; resistivity model; seismogenic
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187602
作者单位	Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing, China; National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing, China; Earthquake Research Institute, The University of Tokyo, Tokyo, Japan
推荐引用方式 GB/T 7714	Ye T.,Chen X.,Huang Q.,et al. Bifurcated Crustal Channel Flow and Seismogenic Structures of Intraplate Earthquakes in Western Yunnan, China as Revealed by Three-Dimensional Magnetotelluric Imaging[J],2020,125(9).
APA	Ye T.,Chen X.,Huang Q.,Zhao L.,Zhang Y.,&Uyeshima M..(2020).Bifurcated Crustal Channel Flow and Seismogenic Structures of Intraplate Earthquakes in Western Yunnan, China as Revealed by Three-Dimensional Magnetotelluric Imaging.Journal of Geophysical Research: Solid Earth,125(9).
MLA	Ye T.,et al."Bifurcated Crustal Channel Flow and Seismogenic Structures of Intraplate Earthquakes in Western Yunnan, China as Revealed by Three-Dimensional Magnetotelluric Imaging".Journal of Geophysical Research: Solid Earth 125.9(2020).