First‐arrival traveltime tomography with modified total‐variation regularization

Jiang, Wenbin; Zhang, Jie

doi:10.1111/1365-2478.12477

Cited by 28 publications

(19 citation statements)

References 35 publications

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“…Thus, in the course of seismic data acquisition and processing, we encountered difficulties (Chen et al 2015) of crossing obstacles, removing harmful scattered waves, and building complex near-surface velocity models. To address those problems, targeted techniques such as cross-obstacle seismic geometry design, angle-domain vector resolution based scattered wave removal (Liu 2013;He et al 2015), and an acoustic wave equation-based inversion method jointly utilizing both the travel time and waveform of first arrival waves (Luo and Schuster 1991;Jiang and Zhang 2016;Yao et al 2019), were adopted.…”

Section: Edited By Jie Haomentioning

confidence: 99%

Active source seismic imaging on near-surface granite body: case study of siting a geological disposal repository for high-level radioactive nuclear waste

et al. 2021

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In order to research whether it is suitable to set a geological disposal repository for high-level radioactive nuclear waste into one target granite body, two active source seismic profiles were arranged near a small town named Tamusu, Western China. The study area is with complex surface conditions, thus the seismic exploration encountered a variettraveltimey of technical difficulties such as crossing obstacles, de-noising harmful scattered waves, and building complex near-surface velocity models. In order to address those problems, techniques including cross-obstacle seismic geometry design, angle-domain harmful scattered noise removal, and an acoustic wave equation-based inversion method jointly utilizing both the and waveform of first arrival waves were adopted. The final seismic images clearly exhibit the target rock’s unconformable contact boundary and its top interface beneath the sedimentary and weathered layers. On this basis, it could be confirmed that the target rock is not thin or has been transported by geological process from somewhere else, but a native and massive rock. There are a few small size fractures whose space distribution could be revealed by seismic images within the rock. The fractures should be kept away. Based on current research, it could be considered that active source seismic exploration is demanded during the sitting process of the geological disposal repository for nuclear waste. The seismic acquisition and processing techniques proposed in the present paper would offer a good reference value for similar researches in the future.

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Section: Edited By Jie Haomentioning

confidence: 99%

Active source seismic imaging on near-surface granite body: case study of siting a geological disposal repository for high-level radioactive nuclear waste

et al. 2021

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“…Tomographic inversion algorithms originate from medical CT imaging technology, also known as image reconstruction technology. The purpose is to obtain the internal profile image of the detected object based on the path data obtained by forward calculation, inversion calculation and velocity distribution diagrams [27], [28]. However, it is very difficult to calculate the solution of the large linear equations formed by forward calculation accurately because of the large amount of data, incompatibility and ill-condition of the equations.…”

Section: Principle Of Saga Tomographic Inversion Algorithmmentioning

confidence: 99%

Ultrasonic Computerized Tomography Imaging Method With Combinatorial Optimization Algorithm for Concrete Pile Foundation

Wang

Chen

et al. 2019

IEEE Access

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Concrete pile foundations are the main load-carrying and aseismic structures for many largescale building structures. Their structural quality will have a great impact on the safety of building structures. However, the imaging results still cannot easily meet practical demands in current ultrasonic Computerized Tomography (CT) imaging tests of concrete structures. In view of the current difficulties, a combinatorial optimization tomographic imaging method is proposed. First, a quadric broadening objective function with a clear physical meaning is established according to the characteristics of ultrasonic propagation in concrete. Then, a new CT imaging method of concrete pile foundation is formed by combining fast adaptive optimization search ability of Genetic Algorithm (GA) with the global search control ability of Simulated Annealing Algorithm (SAA). The numerical simulation experiments have shown that the usage of the correct priori information and the excellent characteristic of the Simulated Annealing Genetic Algorithm (SAGA) in searching for the global minimum value of the function have produced accurate and effective results with stable numerical values. Finally, the imaging method is verified by experiment, where results show that SAGA requires fewer iterations, has faster computation speed and gives more accurate imaging results compared with the single GA.INDEX TERMS Concrete pile foundation, ultrasonic CT, inversion imaging algorithm, combinatorial optimization algorithm, SAGA.

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“…Researchers around the globe have made numerous attempts to suppress staircase artifacts and improve imaging accuracy. ese improvements can be divided into the following categories: (1) generalize the difference of operation in TV to a higher-order difference [18][19][20] or fractional-order difference [21] such as high-order TV [18][19][20][21], total generalized variation [22], and fractional-order TV [23,24]; (2) extend the L1 norm in TV to the Lp quasinorm (0<p < 1) that can obtain sparser solution than the L1 norm, such as TpV [11,17,25,27]; (3) generalize the gradient in TV to the overlapping combination gradient information, such as overlapping group sparsity total variation [28][29][30][31][32]; (4) use Tikhonov regularization and TV regularization to solve the objective function in an alternative way, such as modified TV [33][34][35]; and (5) generalize the two-directional gradient to multidirectional gradient in TV, such as multidirectional TV [3,4,36]. TV can be divided into isotropic total variation (ITV) and anisotropic total variation (ATV) [10,37].…”

Section: Introductionmentioning

confidence: 99%

Multidirectional Anisotropic Total Variation and Its Application in the Tomography of the Surrounding Rock of Coal Mining Faces

Chen

Guang

Yang

2021

Shock and Vibration

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The computed tomography (CT) reconstruction algorithm is one of the crucial components of the CT system. To date, total variation (TV) has been widely used in CT reconstruction algorithms. Although TV utilizes the a priori information of the longitudinal and lateral gradient sparsity of an image, it introduces some staircase artifacts. To overcome the current limitations of TV and improve imaging quality, we propose a multidirectional anisotropic total variation (MATV) that uses multidirectional gradient information. The surrounding rock of coal mining faces uses principles of tomography similar to those of medical X-rays. The velocity distribution for the surrounding rock can be obtained by the first-arrival traveltime tomography of the transmitted waves in the coal mining face. Combined with the geological data, we can interpret the geological hazards in the coal mining face. To perform traveltime tomography, we first established the objective function of the first-arrival traveltime tomography of the transmitted waves based on the MATV regularization and then used the split Bregman method to solve the objective function. The simulated data and real data show that the MATV regularization method proposed in this paper can better maintain the boundaries of geological anomalies and reduce the artifacts compared with the isotropic total variation regularization method and the anisotropic total variation regularization method. Furthermore, this approach describes the distribution of geological anomalies more accurately and effectively and improves imaging accuracy.

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First‐arrival traveltime tomography with modified total‐variation regularization

Cited by 28 publications

References 35 publications

Active source seismic imaging on near-surface granite body: case study of siting a geological disposal repository for high-level radioactive nuclear waste

Active source seismic imaging on near-surface granite body: case study of siting a geological disposal repository for high-level radioactive nuclear waste

Ultrasonic Computerized Tomography Imaging Method With Combinatorial Optimization Algorithm for Concrete Pile Foundation

Multidirectional Anisotropic Total Variation and Its Application in the Tomography of the Surrounding Rock of Coal Mining Faces

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