High-resolution 3-D crustal shear-wave velocity model reveals structural and seismicity segmentation of the central-southern Tanlu Fault zone, eastern China

Shadrach, Terhemba; Yao, Huajian; Luo, Song; Yang, Yunjia; Wang, Xingzhou; Wang, Xiaoli; Li, Lingli; Liu, Bin

doi:10.1016/j.tecto.2020.228372

Cited by 25 publications

(20 citation statements)

References 57 publications

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“…In practice, our whole workflow is implemented in two steps. Firstly, we got a 3-D isotropic Vsv reference model from Bem et al (2020) which is obtained by employing a 3-D direct inversion method (DSurfTomo; Fang et al, 2015). Then, we perform joint inversion for both isotropic Vsv perturbation and azimuthal anisotropy using the DAzimSurfTomo method (C. Liu et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

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Azimuthally Anisotropic Structure in the Crust and Uppermost Mantle in Central East China and Its Significance to Regional Deformation Around the Tan‐Lu Fault Zone

et al. 2022

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Seismic anisotropy can be linked to different mechanisms, structures, and sources. We constrained the 3‐D depth‐dependent shear wave speed isotropic and azimuthally anisotropic structures with Rayleigh wave phase velocity from ambient noise in central Eastern China. We compared the results with other models and found that in the upper crust, the maximum horizontal stress direction differs mainly from the anisotropy that coincides with the strikes of major faults and geologic structures. We inferred that the anisotropy within proximity of faults might be related to fault fabrics, including fractures that strike parallel to the fast axes. The Tan‐Lu Fault controls the anisotropy in the crust to the uppermost mantle. The direction of fast axes in the fault zone is NNE‐SSW to N‐S, coinciding with the fault strike and trend that matches the fault shape on the surface. Southeastern North China craton has a weak anisotropy in the crust and uppermost mantle. The sources are possibly connected to the thrusting, tight trending folds, and dipping thrusts observed to be sub‐parallel to the Dabie Orogenic Belt (DOB). We propose that the NNE‐SSW Zhangbaling uplift group comes from the extension and ductile shearing in the Tan‐Lu Fault zone and the dragging of the northeastern South China Craton in the crust and the uppermost mantle. The N‐S polarized fast axes in the lower crust and uppermost mantle across the Sulu orogen and Xuzhou thrust‐and‐fold belt are the products of the resultant effect of subduction and deep Tan‐Lu faulting.

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Section: Methodsmentioning

confidence: 99%

“…15 of 20 Zhou et al, 2010) with a seismogenic layer in the brittle upper crust -the middle crust (e.g., Bem et al, 2020;Deng et al, 2013;Z. Zhang et al, 2012).…”

Section: 1029/2021jb023532mentioning

confidence: 99%

Azimuthally Anisotropic Structure in the Crust and Uppermost Mantle in Central East China and Its Significance to Regional Deformation Around the Tan‐Lu Fault Zone

et al. 2022

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“…As the largest fault zone in China trending in the north by northeast direction, the Tancheng‐Lujiang (Tanlu) fault extends over 2,400 km from the Lujiang City in the Anhui Province to the Tancheng City in the Shangdong Province, and beyond. In spite of being the largest fault zone located in the eastern part of the Eurasia continent, the TFZ has been seismically inactive in the past 300 years, with the most recent major earthquake occurring in the 17th century (Bem et al., 2020). Though many studies have been carried out in the past few decades, several key questions regarding the fault zone remain unanswered or controversial geologically (e.g., Liang, 2018; Zhang et al., 2008; Zhu et al., 2011).…”

Section: Applications In Imaging the Southern Segment Of The Tfzmentioning

confidence: 99%

Ambient Noise Surface Wave Reverse Time Migration for Fault Imaging

et al. 2020

JGR Solid Earth

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Faults are basic components of subsurface structures that represent discontinuities in physical properties. In addition to being the controlling factor of major tectonic earthquakes (e.g., Angelier, 1990; Martin et al., 2016; Sibson, 1983), subsurface faults also play an essential role in natural resources, including hydrocarbon accumulation and formation of oil and gas reservoirs (Aydin, 2000), aggregation of metallic ore deposits (e.g., Goldfarb et al., 2005; Spencer & Welty, 1986), and generation of geothermal reservoirs (Chen & Huang, 2015). Therefore, detailed characterization of subsurface faults is crucial for understanding tectonic activities and for exploring natural resources. Many geophysical approaches for fault delineation have been proposed in the past decades, such as gravity, magnetic, electromagnetic, and seismic methods (e.g.,

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“…Tan Lu fault zone is a main fault zone formed in a series of NE trending giant fault systems in the Middle Proterozoic on the east Asian continent (Fig. 1), which has a complicated structural, petrogenesis and mineralization evolutionary history (Terhemba SB, et al 2020). The Jiaojia fault, belonging to one of the branch faults of Tan Lu fault, with a continuous and stable main fault surface marked by gray-black fault gouge, has the most intensive gold deposits among the branch faults.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Water-Conducting Fractured Zone in Jiaojia Gold Mine With Deep Mining Based on Constitutive Model

Pang¹,

Wang²,

Shi³

et al. 2021

Preprint

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The deep resources of the gold mines have great potential to be the leading area of the national gold industry. However, with the increase of mining depth in Jiaojia gold mine of Shandong province, China, the overburden stress is increasing, the spatial and temporal distribution of mining stress field is more complex to cause spatial structure of overlying strata seriously damaged, which often leads to mine water disaster. Therefore, the research on the law of surrounding rock stress and water-conducting fractured zone development has become an important topic for safe mining of gold mines. In this paper, based on the analysis of borehole data and profile map, three-dimensional geological model was established to predict the height of the water-conducting fracture zone by using Sufer17, Rhino 6, Griddle plug-in and FLAC3D software, and the mining process with the method of downward horizontal slice stoping-filling was simulated by using constitutive model. Results show that the maximum height of the water-conducting fractured zone is about 21.2 m during the whole mining at -700 level, the shape is from near horizontal to micro arch, the failure range of the plastic area near the fault is larger than that far away from the fault. The stress distribution on both sides of the fault is not continuous, which is larger in the hanging wall than that in the footwall. The stress concentration zone is formed in the front and back of the stope during mining process and increases with mining depth. This method can restore the original state of underground stress field to the greatest extent, and make up for the lack of empirical formula theory and the limitation of similar material method for deep mining, which is relatively more accurate and reliable.

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High-resolution 3-D crustal shear-wave velocity model reveals structural and seismicity segmentation of the central-southern Tanlu Fault zone, eastern China

Cited by 25 publications

References 57 publications

Azimuthally Anisotropic Structure in the Crust and Uppermost Mantle in Central East China and Its Significance to Regional Deformation Around the Tan‐Lu Fault Zone

Azimuthally Anisotropic Structure in the Crust and Uppermost Mantle in Central East China and Its Significance to Regional Deformation Around the Tan‐Lu Fault Zone

Ambient Noise Surface Wave Reverse Time Migration for Fault Imaging

Mechanism of Water-Conducting Fractured Zone in Jiaojia Gold Mine With Deep Mining Based on Constitutive Model

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