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Science China Earth Sciences 2021年第7期64卷 1195-1206页

作者： zigen wei Risheng CHU Zhiwei LI Minhan SHENG Qiu ZENG Slate Key Laboratory of Geodesy and Earth's Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430077China Science and Technology on Reliability and Environmental Engineering Laboratory Beijing Institute of Spacecraft Environment EngineeringBeijing 100094China

Landslides are recurrent geological phenomena on Earth that cause heavy casualties and property losses *** this study,we use the V_(p)-k stacking and nonlinear waveform inversion methods of high-frequency receiver functions extracted from local earthquakes,to sequentially invert Poisson’s ratios and S-wave velocities of the Quaternary Xishancun landslide,which is composed of three segments,i.e.,h1,h2,and h3 from bottom to *** results show that Poisson’s ratio values are generally higher than 0.33 and that the S-wave velocities vary from 0.1 to 0.9 km s^(-1).High Poisson’s ratios(>0.44)are mainly distributed in the juncture regions between different segments,as well as the western edge of *** zones show significant variation in landslide thickness and are potentially hazardous *** velocities of 0.05–0.2 km s^(-1)with thicknesses of 10–30m are widely observed in the lower layer of the *** high Poisson’s ratios and low-velocity layer may be related to water-rich materials in these *** study suggests that the high-frequency receiver functions from local earthquakes can be used to delineate geotechnical structures,which is valuable for landslide stability analysis and hazard mitigation.

关键词： Xishancun landslide High-frequency receiver functions High Poisson's ratio Low S-wave velocity Landslide stability and hazard mitigation

Crustal S-velocity structure and radial anisotropy beneath the southern part of central and western North China Craton and the adjacent Qilian Orogenic Belt from ambient noise tomography

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Science China Earth Sciences 2017年第10期60卷 1752-1768页

作者： LING Yuan CHEN Ling wei zigen JIANG MingMing WANG Xu State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China College of Earth Sciences University of Chinese Academy of Sciences Beijing 100049 CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101 China State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan 430077 China Key Laboratory of the Earth and Planetary Physics Chinese Academy of Sciences Beijing 100029 China

The crustal S-velocity structure and radial anisotropy along a dense linear portable seismic array with 64 broadband seismic stations were investigated from ambient noise tomography with about one-year-long ambient noise recordings. The array transverses the southern part of the central North China Craton(CNCC) and western NCC(WNCC) from east to west and reaches the adjacent Qilian Orogenic Belt(QOB). The phase velocity structures of Rayleigh waves at 5–35 s and Love waves at 5–30 s were measured. The crustal S-velocity structures(Vsv and Vsh) were constructed from the dispersion data(Rayleigh and Love waves,respectively) from point-wise linear inversion with prior information of the Moho depth and average crustal Vp/Vs ratio. The radial anisotropy along the profile was calculated based on the discrepancies between Vsv and Vsh as 2×(***)/(Vsh+Vsv). The results show distinct structural variations in the three major tectonic units. The crustal architecture in the southern CNCC is complicated and featured with wide-distributed low-velocity zones(LVZs), which may be a reflection of crustal modification resulting from Mesozoic-Cenozoic tectonics and magmatic activities. The pronounced positive radial anisotropy in the lower-lowermost crust beneath the Shanxi-Shaanxi Rift and the neighboring areas could be attributed to the underplating of mantle mafic-ultramafic materials during the Mesozoic-Cenozoic tectonic activation. In southern Ordos, the overall weak lateral velocity variations, relative high velocity and large-scale positive radial anisotropy in mid-lower crust probably suggest that the current crustal structure has preserved its Precambrian tectonic characteristics. The low-velocity westward-dipping sedimentary strata in the Ordos Block could be attributed to the Phanerozoic whole-basin tilting and the uneven erosion since late Cretaceous. Integrated with previous studies, the systematic comparison of crustal architecture was made between the southern and nor

关键词： North China Craton Qilian Orogenic Belt Ambient noise tomography Crustal S-velocity structure Radial anisotropy

Determination of the crustal structure and seismicity of the Linfen rift with S-wave velocity mapping

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Frontiers of Earth Science 2020年第3期14卷 647-659页

作者： zigen wei Risheng Chu Meiqin Song Xiaolin Yang Shanshan Wu Feng Bao State Key Laboratory of Geodesy and Earth’s Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan430077China Earthquake Administration of Shanxi Province Taiyuan030021China Shaanxi Earthquake Agency Xi’an710068China Shanghai Earthquake Agency Shanghai200062China

The Linfen rift is a Cenozoic extensional rift with significant seismicity and seismic *** of this rift shed light on deep dynamic processes and seismogenic mechanisms relevant to crustal structure and seismic *** first conducted a joint inversion of receiver functions and surface wave dispersion on waveform data collected from 27 broadband seismic stations to image the crustal S-wave velocity in the Linfen rift and its *** then relocated the source parameters for 10 earthquake events with depths>20 km and studied the relationship between crustal S-wave velocity and *** results show that low-velocity zones of different scales exist in the middle-lower crust,and that the depth of the seismogenic layer gradually increases from^25 km in the south to^34 km in the north,roughly corresponding to the bottom of the low-velocity *** found that most of the relocated earthquakes occurred in the low-velocity zone at depths of 18 km to 34 km,with the deepest at 32 *** of the greatest historic earthquakes,Linfen(Ms 7.75)in 1695 and Hongtong(Ms 8.0)in 1303,occurred at the bottom of the high-velocity zone at depths of 12 km to 18 *** results,combined with previous studies,suggest that the upwelling mantle material below the rift did not remarkably affect the velocity structure from the bottom of the seismogenic layer down to the uppermost mantle nor heat the *** is likely that neither crustal-scale faults nor mantle earthquakes exist in the Linfen rift.

关键词： Linfen rift joint inversion S-wave velocity seismogenic layer deep crustal earthquake

Crustal thickness,V_(P)/V_(S) ratio,and shear wave velocity structures beneath Myanmar and their tectonic implications

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Earthquake Research Advances 2022年第1期2卷 15-21页

作者： Lay Nwe zigen wei Zhiwei Li Feng Bao Xuelei Li Jintao Hu State Key Laboratory of Geodesy and Earth's Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan430077China Science and Technology on Reliability and Environmental Engineering Laboratory Beijing Institute of Spacecraft Environment EngineeringBeijing100094China School of Science Hunan University of Technology and BusinessChangsha410205China Department of Meteorology and Hydrology Ministry of Transport and CommunicationsMyanmar Hebei University of Engineering Handan056009China

The crustal structure in Myanmar can provide valuable information for the eastern margin of the ongoing IndoEurasian collision *** successively performed H-k stacking of the receiver function and joint inversion of the receiver function and surface wave dispersion to invert the crustal thickness(H),shear wave velocity(V_(S)),and the V_(P)/V_(S) ratio(k)beneath nine permanent seismic stations in Myanmar.H was found to increase from 26 km in the south and east of the study area to 51 km in the north and west,and the V_(P)/V_(S) ratio was complex and *** differences in the crust were observed for different tectonic *** the Indo-Burma Range,the thick crust(H~51 km)and lower velocities may be related to the accretionary wedge from the Indian *** the Central Myanmar Basin,the thin crust(H=26.9-35.5 km)and complex V_(P)/V_(S) ratio and V_(S) suggest extensional *** the Eastern Shan Plateau,the relatively thick crust and normal V_(P)/V_(S) ratio are consistent with its location along the western edge of the rigid Sunda Block.

关键词： Myanmar Crustal thickness VP/VSratio Shear wave velocity Receiver function Surface wave dispersion

Regional differences in crustal structure of the North China Craton from receiver functions

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Science China Earth Sciences 2015年第10期58卷 2200-2210页

作者： wei zigen CHU RiSheng CHEN Ling State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and Geophysics Chinese Academy of Sciences State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences

Moho depth and crustal average Poisson＇s ratio for 823 stations are obtained by H-n： stacking of receiver functions. These, to- gether with topography and receiver function amplitude information, were used to study the crustal structure beneath the North China Craton （NCC）. The results suggest that modified and preserved crust coexist beneath the craton with generally Airy-type isostatic equilibrium. The equilibrium is relatively low in the eastern NCC and some local areas in the central and western NCC, which correlates well with regional geology and tectonic features. Major differences in the crust were observed beneath the eastern, central, and western NCC, with average Moho depths of 33, 37, and 42 km and average Poisson＇s ratios of 0.268, 0.267 and 0.264, respectively. Abnormal Moho depths and Poisson＇s ratios are mainly present in the rift zones, the northern and southern edges of the central NCC, and tectonic boundaries. The crust beneath Ordos retains the characteristics of typical craton. Poisson＇s ratio increases roughly linearly as Moho depth decreases in all three parts of the NCC with different slopes. Receiver function amplitudes are relatively large in the northern edge of the eastern and central NCC, and small in and near the rifts. The Yanshan Mountains and southern part of the Shanxi rift show small-scale variations in the receiver-function ampli- tudes. These observations suggest that overall modification and thinning in the crust occurred in the eastern NCC, and local crustal modification occurred in the central and westem NCC. Different crustal structures in the eastern, central, and western NCC suggest different modification processes and mechanisms. The overall destruction of the crustal structure in the eastern NCC is probably due to the westward subduction of the Pacific Plate during the Meso-Cenozoic time; the local modifications of the crust in the central and western NCC may be due to repeated reactivations at zones with a heterogeneous s

关键词： North China Craton Moho depth Poisson's ratio gravitational equilibrium receiver function amplitude regional difference in crust

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Regional variations in crustal thickness and Vp/Vs ratio beneath the central-western North China Craton and adjacent regions

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Regional variations in crustal thickness and Vp/Vs ratio ben...

Lithospheric structure beneath the central and western North China Craton and the adjacent Qilian orogenic belt from Rayleigh wave dispersion analysis

中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： zigen wei LING CHEN BINGYU WANG State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences

Using teleseismic waveform records from 363 broadband stations,we applied H-k stacking of receiver functions to estimate crustal thickness (H) and average Vp/Vs ratio(k) in the central and western North China Craton(NCC) and adjacent *** results show that,except for thinning in the Cenozoic rifts and southern edge of the central NCC,H gradually thickens westward from～30 km at the easternmost edge of the central NCC to >60km near the northeastern margin of the Tibetan Plateau,k exhibits complex variations,with locally high or low anomalies in the rifts,at the southern edge of the central NCC and at tectonic boundary ***-density uppermost mantle and distinct N-S differences are observed in the Ordos,suggesting typical cratonic *** crust and complex variations in k at the southwestern boundary of the Ordos may be related to the formation of the Palaeozoic Qilian Block and late uplift of the Tibetan *** crust and locally high k are observed in and near the Cenozoic rifts,suggesting complex crustal modifications that may have been caused by repeated reactivation at pre-existing weak zones by successive thermal-tectonic *** crust and low k are found at the southern edge of the central NCC,suggesting crustal modifications such as delamination,especially in the lower crust,which may be related to collision of the NCC and Yangtze ***(?) 2012 John Wiley & Sons,Ltd.

关键词： North China Craton Ordos rifts crustal thickness Vp/Vs ratio

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Lithospheric structure beneath the central and western North...

当阳复向斜页岩气探测区地壳结构及其构造暗示

中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： zigen wei Ling Chen Mingming Jiang Yuan Ling State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and Geophysics Chinese Academy of Sciences

We used surface wave tomography to image the lithospheric S-wave velocity structure along a linear seismic array across the central and western North China Craton(NCC) and the adjacent Qilian orogenic belt(QB).Using waveform data from 8 earthquakes collected at 60 broadband stations, Rayleigh wave phase velocities were measured at periods of 20–120 s and subsequently inverted for reliable S-wave velocities from 60 to200 km depth. Distinct lithospheric structures and marked lateral variations were revealed beneath the study region, correlating well with regional geological and tectonic features. The average S-wave velocity from 60 to 200 km depth beneath the array is ～4.45 km/s, ～1% lower than that in model AK135. High velocities of N 4.45 km/s are most pronounced beneath the stable Ordos Block(western NCC). However, the depth to which the observed high velocity body extends varies significantly laterally. It is deepest(～200 km) under eastern Ordos, and becomes shallower on both sides along the array. The maximum depth of the high velocity body gradually shallows westward and reaches ～110 km near the western edge of Ordos. This depth variation suggests a coexistence of both preserved and modified lithosphere in Ordos. The depth of high velocities decreases rapidly eastward by N 80 km over a lateral distance of b 200 km across the North–south Gravity Lineament(NSGL) in central NCC, supporting the speculation that the NSGL represents a major continental-lithospheric boundary. A stratified lithospheric mantle was revealed beneath QB, the ～2% low velocity anomaly above 100 km depth may be attributed partially to a higher temperature here. Our study revealed rapid lithospheric structural variations beneath NSGL and the boundary zone between Ordos and QB, probably reflecting long-lived, inherited weaknesses in lithosphere that may have been enhanced by episodic tectonic reactivations during the evolution of NCC.

关键词： Rayleigh waves Phase velocity dispersion S-wave velocity structure of the lithosphere Rapid structural variations North China Craton Qilian orogenic belt

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地球物理学报 2024年第8期67卷 2963-2971页

作者：危自根储日升谢军范心甜中国科学院精密测量科学与技术创新研究院大地测量与地球动力学国家重点实验室武汉430077

本文采用接收函数H-κ叠加、多频接收函数和面波联合反演方法,获得了扬子克拉通当阳复向斜区21个密集流动地震台下方的地壳厚度、V_(p)/V_(s)比和S波速度.结果表明,该区平均地壳厚度和V_(p)/V_(s)比值分别为33.8 km和1.75,推测当阳复向... 详细信息

本文采用接收函数H-κ叠加、多频接收函数和面波联合反演方法,获得了扬子克拉通当阳复向斜区21个密集流动地震台下方的地壳厚度、V_(p)/V_(s)比和S波速度.结果表明,该区平均地壳厚度和V_(p)/V_(s)比值分别为33.8 km和1.75,推测当阳复向斜经历过下地壳减薄但地壳整体尚保持典型克拉通结构特征.研究区绝大部分台站都在3~4 km深度存在1~2 km厚的低S波速度层,推测可能与该深度范围内富集高孔隙度和低密度的页岩气层有关.本研究表明,基于密集流动地震台阵被动源数据资料,可为油气资源勘探提供有价值的参考.

关键词：当阳复向斜页岩气勘探低速薄层接收函数和面波联合反演接收函数H-κ叠加

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腾冲火山壳幔过渡带分析及岩浆上涌通道初探

地震研究 2025年第1期48卷 41-48页

作者：范心甜危自根谢军程智伟凌媛李雪垒刘益炜中国科学院精密测量科学与技术创新研究院大地测量与地球动力学国家重点实验室湖北武汉430077 中国科学院大学地球与行星科学学院北京100049 河北工程大学地球科学与工程学院河北邯郸056038 中国科学院地质与地球物理研究所地球和行星物理重点实验室北京100029 湖南工商大学微电子与物理学院湖南长沙410205

壳幔过渡带是地壳与地幔物质和能量的交换场所,其结构特征与该区的深部过程和构造演化密切相关。提取腾冲火山区31个地震台站下方的接收函数H-κ叠加获得的地壳厚度随频率变化特征和接收函数的Ps/P、PpPs/P振幅比,发现盈江断裂北部的黑... 详细信息

壳幔过渡带是地壳与地幔物质和能量的交换场所,其结构特征与该区的深部过程和构造演化密切相关。提取腾冲火山区31个地震台站下方的接收函数H-κ叠加获得的地壳厚度随频率变化特征和接收函数的Ps/P、PpPs/P振幅比,发现盈江断裂北部的黑空山-燃灯寺和南侧沙坝台区域具有比周边区域更低的振幅比,约有2 km地壳厚度差异。将该观测结果与前人获得的这两个区域相对薄的地壳厚度与高的V_(P)/V_(S)比值相结合,表明黑空山-燃灯寺和沙坝台区域具有厚的壳幔过渡带,推测其是地幔物质涌入地壳的通道。结合前人获得的该区上、中、下地壳都存在大片低速体的特征,推测来自地幔的岩浆很可能沿着腾冲火山区黑空山-燃灯寺和沙坝台这两个区域上涌到地壳,并依次在下、中和上地壳富集和横向展布,最终沿多个通道喷出地表。

关键词：腾冲火山接收函数振幅比地壳厚度壳幔过渡带地幔上涌通道

Presence of an intralithospheric discontinuity in the central and western North China Craton:Implications for destruction of the craton

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Presence of an intralithospheric discontinuity in the centra...