Three-dimensional crustal velocity structure model of the middle-eastern north China Craton (HBCrust1.0)

Duan, Yonghong; Wang, Fuyun; Zhang, XianKang; Lin, Jian; Liu, Zhi; Liu, Baofeng; Yang, Zhuoxin; Guo, Wenbin; Wei, Yunhao

doi:10.1007/s11430-016-5301-0

Cited by 52 publications

(39 citation statements)

References 6 publications

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“…RF: Receiver function. LM98: Li and Mooney , ; T13: Teng et al , ; L14: Y. H. Li et al , ; H14: He et al , ; W16: Wei et al , ; S04: Sun et al , ; S08: Sun et al , ; G12: Guo et al , ; L06: W14: C. Y. Wang et al , ; Li et al , ; G98: Gao et al , ; D16: Duan et al , ; NCcrust: our study.…”

Section: Introductionmentioning

confidence: 53%

“…(a) Topography and deep seismic profiles used to constrain NCcrust (Black lines: geological boundary; blue lines: profiles 1–10 in Table ; pink lines: profiles 11–14 in Table ; yellow lines: profiles 15–48 in Table ; white dots: Receiver function interpretations for the Moho depth). (b) Coverage of the China continent by models of the Moho depth (deep seismic sounding: [ Li and Mooney , ; Li et al , ; Teng et al , ]; receiver functions: [ Y. H. Li et al , ; He et al , ; Wei et al , ]; tomography: [ Sun et al , , ; Gravity: Guo et al , ]; and crustal structure [ Gao et al , ; Li et al , ; Duan et al , ].…”

Section: Introductionmentioning

confidence: 99%

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Seismic crustal structure of the North China Craton and surrounding area: Synthesis and analysis

2017

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We present a new digital model (NCcrust) of the seismic crustal structure of the Neoarchean North China Craton (NCC) and its surrounding Paleozoic‐Mesozoic orogenic belts (30°–45°N, 100°–130°E). All available seismic profiles, complemented by receiver function interpretations of crustal thickness, are used to constrain a new comprehensive crustal model NCcrust. The model, presented on a 0.25° × 0.25°grid, includes the Moho depth and the internal structure (thickness and velocity) of the crust specified for four layers (the sedimentary cover, upper, middle, and lower crust) and the Pn velocity in the uppermost mantle. The crust is thin (30–32 km) in the east, while the Moho depth in the western part of the NCC is 38–44 km. The Moho depth of the Sulu‐Dabie‐Qinling‐Qilian orogenic belt ranges from 31 km to 51 km, with a general westward increase in crustal thickness. The sedimentary cover is 2–5 km thick in most of the region, and typical thicknesses of the upper crust, middle crust, and lower crust are 16–24 km, 6–24 km, and 0–6 km, respectively. We document a general trend of westward increase in the thickness of all crustal layers of the crystalline basement and as a consequence, the depth of the Moho. There is no systematic regional pattern in the average crustal Vp velocity and the Pn velocity. We examine correlation between the Moho depth and topography for seven tectonic provinces in the North China Craton and speculate on mechanisms of isostatic compensation.

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Section: Introductionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Seismic crustal structure of the North China Craton and surrounding area: Synthesis and analysis

2017

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“…In addition, Jia et al (2009) proposed that the entirely different crustal structures between the stable Yanshan uplift with high velocity in the north and the incompact rift basin (NCB in our study) with low velocity in the south make the transitional zone between the tectonic zoning line of the faults and Yanshan uplift provide a favourable structural environment occurrence of earthquakes in the eastern plain region (NCP in our study) of Zhangjiakou-Bohai belt (Tangshan region in our study), which is similar to the result of our analysis. The results by the dense seismic array observations reveal that low-velocity anomalies are distributed in heterogeneous media of upper and middle crust over crust-mantle boundary with obvious block uplift, coupled with the top anomalous uplift of the upper mantle beneath the Tangshan earthquake region ); prominent low-velocity anomalies extending from the upper crust to the lower crust in Tangshan earthquake region were also found by Duan et al (2016), and the earthquake distribution extends from the upper crust to the uppermost lower crust (Duan et al 2016). Therefore, Duan et al (2016) deemed that crust deformation in the Tangshan earthquake region passes through the entire crust, with the brittle failure of upper crust and ductile deformation of lower crust, and inferred that the stress accumulation of Tangshan earthquakes is closely related to migration and deformation of the mantle material.…”

Section: S-wave Velocity Images Of the Tangshan Regionmentioning

confidence: 77%

“…The results by the dense seismic array observations reveal that low-velocity anomalies are distributed in heterogeneous media of upper and middle crust over crust-mantle boundary with obvious block uplift, coupled with the top anomalous uplift of the upper mantle beneath the Tangshan earthquake region ); prominent low-velocity anomalies extending from the upper crust to the lower crust in Tangshan earthquake region were also found by Duan et al (2016), and the earthquake distribution extends from the upper crust to the uppermost lower crust (Duan et al 2016). Therefore, Duan et al (2016) deemed that crust deformation in the Tangshan earthquake region passes through the entire crust, with the brittle failure of upper crust and ductile deformation of lower crust, and inferred that the stress accumulation of Tangshan earthquakes is closely related to migration and deformation of the mantle material. In our study, the Tangshan earthquakes are distributed from the upper crust (Fig.…”

Section: S-wave Velocity Images Of the Tangshan Regionmentioning

confidence: 77%

Crustal structure beneath Liaoning province and the Bohai Sea and its adjacent region in China based on ambient noise tomography

2017

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The velocity structure of the crust beneath Liaoning province and the Bohai sea in China was imaged using ambient seismic noise recorded by 73 regional broadband stations. All available three-component time series from the 12-month span between January and December 2013 were cross-correlated to yield empirical Green's functions for Rayleigh and Love waves. Phasevelocity dispersion curves for the Rayleigh waves and the Love waves were measured by applying the frequencytime analysis method. Dispersion measurements of the Rayleigh wave and the Love wave were then utilized to construct 2D phase-velocity maps for the Rayleigh wave at 8-35 s periods and the Love wave at 9-32 s periods, respectively. Both Rayleigh and Love phase-velocity maps show significant lateral variations that are correlated well with known geological features and tectonics units in the study region. Next, phase dispersion curves of the Rayleigh wave and the Love wave extracted from each cell of the 2D Rayleigh wave and Love wave phase-velocity maps, respectively, were inverted simultaneously to determine the 3D shear wave velocity structures. The horizontal shear wave velocity images clearly and intuitively exhibit that the earthquake swarms in the Haicheng region and the Tangshan region are mainly clustered in the transition zone between the low-and high-velocity zones in the upper crust, coinciding with fault zones, and their distribution is very closely associated with these faults. The vertical shear wave velocity image reveals that the lower crust downward to the uppermost mantle is featured by distinctly high velocities, with even a high-velocity thinner layer existing at the bottom of the lower crust near Moho in central and northern the Bohai sea along the Tanlu fault, and these phenomena could be caused by the intrusion of mantle material, indicating the Tanlu fault could be just as the uprising channel of deep materials.

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“…In order to further test the impact of initial model selection on the final model, we start the adjoint tomographic inversion with an initial model constructed from HBCrust1.0 (Duan et al, 2016) (Figure 10a). This is originally a compressional wave speed model constructed by the wide-angle reflection/refraction method, which is then scaled to a shear wave speed model, M23_Duan_initial.…”

Section: Different Initial Modelsmentioning

confidence: 99%

Linear Array Ambient Noise Adjoint Tomography Reveals Intense Crust‐Mantle Interactions in North China Craton

et al. 2018

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We present a 2‐D ambient noise adjoint tomography technique for a linear array with a significant reduction in computational cost and show its application to an array in North China. We first convert the observed data for 3‐D media, i.e., surface‐wave empirical Green's functions (EGFs) to the reconstructed EGFs (REGFs) for 2‐D media using a 3‐D/2‐D transformation scheme. Different from the conventional steps of measuring phase dispersion, this technology refines 2‐D shear wave speeds along the profile directly from REGFs. With an initial model based on traditional ambient noise tomography, adjoint tomography updates the model by minimizing the frequency‐dependent Rayleigh wave traveltime delays between the REGFs and synthetic Green functions calculated by the spectral‐element method. The multitaper traveltime difference measurement is applied in four‐period bands: 20–35 s, 15–30 s, 10–20 s, and 6–15 s. The recovered model shows detailed crustal structures including pronounced low‐velocity anomalies in the lower crust and a gradual crust‐mantle transition zone beneath the northern Trans‐North China Orogen, which suggest the possible intense thermo‐chemical interactions between mantle‐derived upwelling melts and the lower crust, probably associated with the magmatic underplating during the Mesozoic to Cenozoic evolution of this region. To our knowledge, it is the first time that ambient noise adjoint tomography is implemented for a 2‐D medium. Compared with the intensive computational cost and storage requirement of 3‐D adjoint tomography, this method offers a computationally efficient and inexpensive alternative to imaging fine‐scale crustal structures beneath linear arrays.

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Three-dimensional crustal velocity structure model of the middle-eastern north China Craton (HBCrust1.0)

Cited by 52 publications

References 6 publications

Seismic crustal structure of the North China Craton and surrounding area: Synthesis and analysis

Seismic crustal structure of the North China Craton and surrounding area: Synthesis and analysis

Crustal structure beneath Liaoning province and the Bohai Sea and its adjacent region in China based on ambient noise tomography

Linear Array Ambient Noise Adjoint Tomography Reveals Intense Crust‐Mantle Interactions in North China Craton

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