气候变化领域集成服务门户(CCPortal): Continental-scale deep electrical resistivity structure beneath China

CCPortal

DOI	10.1016/j.tecto.2020.228559
	Continental-scale deep electrical resistivity structure beneath China
	Yuan Y.; Uyeshima M.; Huang Q.; Tang J.; Li Q.; Teng Y.
发表日期	2020
ISSN	00401951
卷号	790
英文摘要	Electrical resistivity structure in the deep Earth can provide important information and constraints on regional geodynamics, especially in regions with complex tectonics and geodynamical processes. In this study, we image the electrical resistivity structure in the depth range of 350–1200 km beneath China by inverting the frequency-dependent ratios of geomagnetic field components at a relatively dense network of geomagnetic observatories. Very long time series of hourly mean values of the three-component geomagnetic field from 45 geomagnetic observatories are collected and processed to derive robust ratios of the geomagnetic components, which are then converted to the apparent resistivities and impedance phases in the period range of 5.3–113.8 days and used in 1-D Occam inversion with smoothing constraint and the ρ+ method to obtain the electrical resistivity profiles and delta function models at individual observatories. 1-D electrical resistivity models suggest that low electrical resistivity structure exists in the mantle transition zone beneath eastern China. High water content in the mantle minerals due to the subduction of seismically fast Pacific slab is proposed as the main reason for the low electrical resistivity beneath eastern China. Our results provide further evidence that the western front of the subducting Pacific slab in the mantle transition zone roughly coincides with the abrupt change in the surface topography in eastern China. © 2020 Elsevier B.V.
关键词	Electrical resistivity Mantle transition zone Ratio of geomagnetic components Subduction slabs Water content
英文关键词	Delta functions; Geodynamics; Geomagnetism; Observatories; Topography; Apparent resistivity; Continental scale; Electrical resistivity structures; Frequency dependent; Geomagnetic component; Geomagnetic fields; High water content; Mantle transition zone; Electric conductivity; electrical resistivity; geodynamics; geomagnetic field; topography; transition zone; water content; China
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207910
作者单位	Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China; Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing, 100871, China; Earthquake Research Institute, the University of Tokyo, Tokyo, 113-0032, Japan; Institute of Geology, China Earthquake Administration, Beijing, 100029, China
推荐引用方式 GB/T 7714	Yuan Y.,Uyeshima M.,Huang Q.,et al. Continental-scale deep electrical resistivity structure beneath China[J],2020,790.
APA	Yuan Y.,Uyeshima M.,Huang Q.,Tang J.,Li Q.,&Teng Y..(2020).Continental-scale deep electrical resistivity structure beneath China.Tectonophysics,790.
MLA	Yuan Y.,et al."Continental-scale deep electrical resistivity structure beneath China".Tectonophysics 790(2020).