Showing papers in "Journal of Applied Geophysics in 2018"

TL;DR: In this paper, an experiment was carried out to study the thermal effect (from 25°C to 600°C) on stress-strain behavior, elastic modulus, peak stress, thermal damage, and tensile strength of Jalore granite, India and compared with similar properties of granite from other countries.

TL;DR: In this paper, an underground real-time microseismic monitoring technique has been implemented in the working panel-P2 in the Rajendra longwall underground coal mine at South Eastern Coalfields Limited (SECL), India.

TL;DR: Particle Swarm optimization algorithm resolves constrained multi-parameter problems and is suitable for simultaneous optimization of linear and nonlinear problems, with the assumption that forward modeling is based on good understanding of ill-posed problem for geophysical inversion.

TL;DR: In this paper, a blind test of nondestructive underground void detection in highway/pavement using ground penetrating radar (GPR) is introduced, which can help the Highways Department of Hong Kong Government to evaluate the feasibility of large-scale and nationwide application, and examine the ability of appropriate service providers to carry out such works.

TL;DR: In this paper, a set of seismic attributes amalgamated with interpreter's acquaintances results into a meta-attribute that augments interpretation of geological discontinuities from seismic data, and the attribute sets are trained over example locations selected from the data volume through a fully connected multilayer perceptron (MLP) based on artificial neural network (ANN).

TL;DR: The method proposed is an automatic noise attenuation algorithm to facilitate a fast preprocessing of massive prestack seismic data to deal with the residual noise in the roughly estimated signal from the previous step.

TL;DR: An integrated geophysical approach involving 2D modeling of electrical resistivity tomography (ERT) and magnetic methods has been employed at a highly heterogeneous site in Guangdong, South China, with a view at mapping the subsurface structures and delineating the weathered/fracture zones for groundwater potential as mentioned in this paper.

TL;DR: In this article, a combined DC resistivity and induced polarization (DC-IP) approach was employed to characterize an AMD-generating mine waste rock pile (WRP) in the Sydney Coalfield, Nova Scotia, Canada.

TL;DR: Six machine learning methods combined with data balancing techniques and a model selection approach to classify geologic data from the South Provence Basin show the balancing strategies improve the overall performance of all classifiers and the model selection allows or obtaining the best parameters from a user-defined set.

TL;DR: In this paper, a field-based framework was developed using modified soil-water characteristic curves and in-situ electrical conductivity measurements that allows 2D electrical resistivity measurements to be a predictor of shear strength.

TL;DR: In this paper, a physical simulation experiment was conducted with a triaxial hydraulic fracturing test system and the results demonstrated that the number of hydraulic fractures in coal is considerably higher than that observed in other parts, and the fracture morphology was complex.

TL;DR: This paper applies a projected Marchenko scheme to a 2D numerical example to illustrate the procedure of this method and show how the internal multiple reflection eliminated data set can be retrieved and the migration image is improved.

TL;DR: In this article, the fundamental role played by Ground Penetrating Radar (GPR) alongside advanced processing and presentation methods, during the tunnel boring project at a Dam and Hydro-electric Power Station.

TL;DR: In this article, an adaptive unstructured mesh finite element (FE) procedure is presented for improving the quality of numerical solutions to the magnetotelluric forward problem in a general 2-D anisotropic conductivity structure.

TL;DR: In this paper, the authors applied ground penetrating radar (GPR) images for the characterization of ground conditions in urban areas and applied time domain reflectometry (TDR) and dynamic cone penetrometer (DCP) tests for the accurate analyses of the GPR images.

TL;DR: In this article, a numerical and experimental study of the cracking behavior of a rock specimen containing a single filled flaw under compression is presented, where the authors investigate the influences of infill on crack patterns, load-displacement response and specimen strength.

TL;DR: In this paper, an edge-based finite element (FE) method has been developed for 3D magnetotelluric (MT) modeling in general anisotropic media, which is based on the initial derivation of a series of equivalent variational equations that are based on Maxwell equations, generated using the weighted residual method.

TL;DR: Wang et al. as mentioned in this paper studied the relationship between energy change and confining pressure during the process of sandstone damage, and its characteristics of energy storage and energy dissipation in different deformation stage.

TL;DR: A field-scale unified permeability model for the tight gas sands of the Middle Jurassic Shaximiao Formation in the Western Sichuan Basin, China is established using simple linear regression using porosity, multiple linear regression, multiple-layer perceptron and support vector regression using multiple input features as machine learning methods.

TL;DR: In this paper, the use of non-or minimally destructive methods to study damp in San Juan Bautista Church at Talamanca de Jarama in the Spanish province of Madrid was described.

TL;DR: The results support the use of spectral induced polarization and shear-wave velocity as soil strengthening characterization and long term monitoring tools, which is a requirement for viable soil stabilization projects.

TL;DR: The HHT bolt signal analysis method is a self-adaptive and automatic process, which can be programed as analysis software and will make bolt tests more convenient in practice and may play an important role in future studies.

TL;DR: In this paper, the EMR characteristics of coal and rock samples under uniaxial loading are studied and several typical microcosmic mechanisms affecting the characteristics of EMR are discussed, such as strength, composition and microstructure of the samples.

TL;DR: In this article, the application of BHA to solve inversions of field and synthetic self-potential (SP) data is investigated, and the inversion results show that BHA accurately determines model parameters and model uncertainty.

TL;DR: In this paper, a demodulation method which can contain both the amplitude and polarity information of the envelope data was proposed to solve the shortcomings of conventional envelope inversion, using new envelope Frechet derivative and multi-scale inversion strategy to invert strong contrast models.

TL;DR: It was shown that the new algorithm causes a considerable improvement in the maintenance effectiveness and an increase in the life cycle of railway tracks by making more effective allocation of resources and more accurate maintenance planning.

TL;DR: In this paper, collapse sinkholes have formed on a sports field in Munsterdorf, with a frequency of about 1 every two years, about 3-5-m in diameter and 3 −5m deep.

TL;DR: Wang et al. as discussed by the authors presented a method to establish a new three-dimensional rock physics template (3D RPT) by integrating the Gassmann equations and the porous rock physics model, and use it to characterize the quantitative relation between rock elastic properties and the reservoir parameters including the pore aspect ratio, porosity and water saturation, and predict these parameters from the known elastic properties.

TL;DR: In this article, the authors presented a field example which was conducted over a molybdenum mine with the newly developed instruments, such as the high power transmitter and the pseudo random binary sequences (PRBS).

TL;DR: In this article, a new ambient noise data selection technique based on the asymmetry of the cross-correlation functions is proposed to refine the quality of data processing in the complex city environment.