Azimuthal anisotropy of the crust and uppermost mantle in northeast North China Craton from inversion of Rayleigh wave phase velocity

Chen, Haopeng; Zhu, L.; Ye, Qingdong; Yang, Yichen; Pan, Zhiyong

doi:10.1093/gji/ggv153

Cited by 17 publications

(20 citation statements)

References 60 publications

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“…The Zhangjiakou‐Penglai Fault Zone, where the observed δt measurements are the largest in the study area, is also the seismically most active zone. In addition, previous studies (Chen et al, ; Huang & Zhao, ) found that the historical large earthquakes in the CNCC more frequently occurred in the transition zone of low‐ and high‐velocity anomalies. We speculate that the observed significant crustal anisotropy in the Zhangjiakou‐Penglai Fault Zone is closely related to the degree of crustal deformation which is in turn associated with the historical large earthquakes.…”

Section: Discussionmentioning

confidence: 84%

“…Good agreements (Figure and Table ) among the GPS observations, the P m s moveout, and the XKS splitting in the northwestern CNCC, further imply a coupled crust and mantle deformation model. In contrast, significant discrepancies among the three measurements in the eastern CNCC, together with the significant depth variations of the dominant fast orientations revealed by surface wave tomography (Chen et al, ), may suggest that the crust and mantle are possibly decoupled. Ambient noise tomography study (Bao et al, ) revealed that the western CNCC is marked by a high‐velocity (perhaps also higher viscosity) structure from the middle and lower crust to the upper mantle, whereas the eastern CNCC is characterized by low velocities (perhaps lower viscosity) compared to the stable western CNCC.…”

Section: Discussionmentioning

confidence: 97%

“…The Moho depth also decreases from west to east (Jia et al, ; Li et al, ). Surface wave phase velocity tomography (Chen et al, , ) and ambient noise tomography investigations (Bao et al, ) revealed that relative to the western part, the eastern Yanshan Uplift has a lower velocity structure from the middle and lower crust to the upper mantle.…”

Section: Discussionmentioning

confidence: 99%

“…Besides crustal anisotropy investigations using RFs, a number of surface wave and Pn anisotropy tomography studies have been conducted in the CNCC. Chen et al () determined 3‐D azimuthal anisotropy from inversion of Rayleigh wave dispersions. At the depth range of 30–40 km, the NE‐SW trending anisotropy in the Datong Basin and NW‐SE trending anisotropy in the western Yanshan Uplift are consistent with results from this study.…”

Section: Comparison With Previous Crustal Anisotropy Studiesmentioning

confidence: 99%

“…A number of seismic anisotropy studies, including shear wave splitting (e.g., Bai et al, 2010;Chang et al, 2011Chang et al, , 2012aGao et al, 2010;Liu et al, 2008;Zhao & Xue, 2010), surface wave tomography (e.g., Chen et al, 2015;Legendre et al, 2014), and Pn anisotropy tomography (e.g., Zhou & Lei, 2016), have been conducted in the CNCC. Chang et al (2012a) used SKS splitting to reveal a significant correlation between the fast orientation of upper mantle anisotropy and the absolute plate motion direction in the CNCC and interpreted the correlation by a simple asthenospheric mantle flow.…”

Section: Previous Crustal and Mantle Anisotropy Studies In The Cnccmentioning

confidence: 99%

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Crustal Azimuthal Anisotropy Beneath the Central North China Craton Revealed by Receiver Functions

Zheng

Ding

Ning

et al. 2019

Geochem Geophys Geosyst

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To characterize crustal anisotropy beneath the central North China Craton (CNCC), we apply a recently developed deconvolution approach to effectively remove near‐surface reverberations in the receiver functions recorded at 200 broadband seismic stations and subsequently determine the fast orientation and the magnitude of crustal azimuthal anisotropy by fitting the sinusoidal moveout of the P to S converted phases from the Moho and intracrustal discontinuities. The magnitude of crustal anisotropy is found to range from 0.06 s to 0.54 s, with an average of 0.25 ± 0.08 s. Fault‐parallel anisotropy in the seismically active Zhangjiakou‐Penglai Fault Zone is significant and could be related to fluid‐filled fractures. Historical strong earthquakes mainly occurred in the fault zone segments with significant crustal anisotropy, suggesting that the measured crustal anisotropy is closely related to the degree of crustal deformation. The observed spatial distribution of crustal anisotropy suggests that the northwestern terminus of the fault zone probably ends at about 114°E. Also observed is a sharp contrast in the fast orientations between the western and eastern Yanshan Uplifts separated by the North‐South Gravity Lineament. The NW‐SE trending anisotropy in the western Yanshan Uplift is attributable to “fossil” crustal anisotropy due to lithospheric extension of the CNCC, while extensional fluid‐saturated microcracks induced by regional compressive stress are responsible for the observed ENE‐WSW trending anisotropy in the eastern Yanshan Uplift. Comparison of crustal anisotropy measurements and previously determined upper mantle anisotropy implies that the degree of crust‐mantle coupling in the CNCC varies spatially.

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Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Comparison With Previous Crustal Anisotropy Studiesmentioning

confidence: 99%

Section: Previous Crustal and Mantle Anisotropy Studies In The Cnccmentioning

confidence: 99%

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Crustal Azimuthal Anisotropy Beneath the Central North China Craton Revealed by Receiver Functions

Zheng

Ding

Ning

et al. 2019

Geochem Geophys Geosyst

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Rayleigh wave azimuthally anisotropic phase velocity maps beneath western Canada

Bao

Eaton

2016

JGR Solid Earth

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The lithospheric evolution of western Laurentia spans several billion years of Earth history and provides an exceptional opportunity for investigating continental deformation during Archean and Proterozoic assembly of the craton and subsequent Phanerozoic orogenic processes along its western margin. In this study we present fundamental‐mode Rayleigh wave azimuthal anisotropy in the period range 20–150 s for western Laurentia and the southern Canadian Cordillera. The surface wave phase velocity maps offer new constraints on the depth distribution of seismic anisotropy in this region. At short periods (20–25 s), strong anisotropy with an orogen‐parallel fast direction is evident in the Cordillera and neighboring foreland belt, suggesting pervasive ductile deformation in the lower crust during Laramide orogenesis. At periods of 70 s and higher, a zone of low‐to‐null azimuthal anisotropy is evident in the southern part of the Cordillera. This apparent null region is interpreted to reflect complex asthenospheric flow due to the combined effects of the Juan de Fuca slab window, lithospheric delamination, and small‐scale edge‐driven convection. Depth‐variant azimuthal anisotropy is evident beneath the cratonic part of the study region. The dominant direction of fast wave propagation in the southeastern part of the craton changes from N‐S at periods of <120 s to NE‐SW at 150 s period. This depth dependence is inferred to arise from different origins of the observed anisotropy, with “frozen” anisotropy within cratonic lithosphere underlain by flow‐driven anisotropy in the asthenosphere. The frozen N‐S trending fabrics in the middle to lower cratonic lithosphere most likely reflect processes of Paleoproterozoic assembly of western Laurentia.

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P-wave velocity structure in the crust and the uppermost mantle of Chao Lake region of the Tan-Lu Fault inferred from teleseismic arrival time tomography

et al. 2022

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Azimuthal anisotropy of the crust and uppermost mantle in northeast North China Craton from inversion of Rayleigh wave phase velocity

Cited by 17 publications

References 60 publications

Crustal Azimuthal Anisotropy Beneath the Central North China Craton Revealed by Receiver Functions

Crustal Azimuthal Anisotropy Beneath the Central North China Craton Revealed by Receiver Functions

Rayleigh wave azimuthally anisotropic phase velocity maps beneath western Canada

P-wave velocity structure in the crust and the uppermost mantle of Chao Lake region of the Tan-Lu Fault inferred from teleseismic arrival time tomography

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