Showing papers in "Journal of Applied Geophysics in 2016"

TL;DR: In this paper, the authors explored the influence of methane to coal and studying fractal characteristics and acoustic emission (AE) features in the damage evolution, the triaxial compression experiments of coal containing methane were conducted, and the acoustic emission response was collected simultaneously in the loading process.

TL;DR: In this article, a fast projection onto convex sets (POCS) algorithm with sparsity constraint in the seislet transform domain was proposed to obtain faster and better performance than FISTA.

TL;DR: In this article, a noise level estimation and noise reduction algorithm is presented for microseismic data analysis based upon minimally controlled recursive averaging and neighborhood shrinkage estimators, which can be applied in real-time processing of continuous data for event detection purposes.

TL;DR: In this article, a multi-scale morphological method is proposed to detect weak micro-seismic signals caused by hydraulic fracturing, which decomposes data set into multiscale components based on the mathematical morphology theory using structuring element that is similar to the wavelet basis in the well-known wavelet decomposition.

TL;DR: A new fluid identification method in carbonate reservoir based on the modified Fuzzy C-Means (FCM) Clustering algorithm, which has a good ability of fuzzy cluster and its total coincidence rate of fluid prediction reaches 97.10%.

TL;DR: In this article, a study from an active landslide in a Lias Group clay slope, North Yorkshire, UK, examining combined P- and S-wave seismic refraction tomography (SRT) as a means of providing subsurface volumetric imaging of geotechnical proxies.

TL;DR: In this article, the authors evaluated the diffusion of landfill leachate before and after the rainy season using 3-D electrical resistivity imaging (ERI) characterization, which is suitable for monitoring groundwater contamination because this method helps quickly investigate a large site without the need for well drilling.

TL;DR: In this article, a stochastic vector-based metaheuristic algorithm is proposed to estimate model parameters from residual gravity data based on differential evolution (DE), which is used for both synthetic and field anomalies.

TL;DR: In this article, the GEOMON 4 D resistivity instrument was installed permanently on-site for a period of one year and no significant relationships between the electrical response and the measured hydrological parameters are evidenced.

TL;DR: In this article, the internal structure of the southern region of the Kualiangzi landslide was investigated using four electrical resistivity tomography (ERT) profiles, drill cores, and inclinometer data.

TL;DR: In this article, the authors studied the wave characteristics of natural mineral earthquake and blast in a coal mine based on the Hilbert-Huang transform (HHT) method, and found that the dominant frequency of Natural mineral earthquake wave is 20 Hz, which is lower than the other frequency bands.

TL;DR: In this article, the authors performed 2D resistivity and IP measurements over a known olive oil mill waste plume at a site in western Crete, Greece and found that the organic plume is characterized as a region of high electrical conductivity consistent with the conceptual model for the electrical structure of a biodegraded LNAPL contaminant plume.

TL;DR: In this article, the pore aspect ratio received from velocity interpretation and pore-surface-to-pore-volume ratio Spor were combined with theoretical calculations for ellipsoidal inclusions.

TL;DR: In this paper, a discrete wavelet transform (DWT) and short time average to long time average (STA/LTA)-based Kurtosis algorithm (W-S/L-K method) is proposed to pick the arrival time of the P-phase; this method advantageously combines the outstanding ability of retrieving the P -phase arrival information from wavelet coefficients at high resolutions with inherent reliability in obtaining the P −phase arrival time using the STA/L TA picking method.

TL;DR: In this paper, the authors used discriminant analysis to determine the efficacy of magnetic measures for discriminating between four soil moisture regimes in northern Iran, including aridic, xeric, udic, and aquic.

TL;DR: In this article, a methodology for developing resistivity-moisture content relationships of materials associated with a clayey landslide is presented, which includes sample selection and preparation, laboratory measurement of resistivity with changing moisture content, and derivation of models describing the relationship between resistivity and moisture content.

TL;DR: In this paper, the authors focus on the recent applications of nuclear magnetic resonance (NMR) technology for characterizing fractures in conventional sandstone and carbonate reservoirs, but the reality for unconventional resources is that such techniques are still poorly developed.

TL;DR: In this article, the relationship between bulk density/penetration resistance (PR) and ground penetrating radar (GPR) signals was analyzed. But the authors did not consider the influence of soil bulk density on electromagnetic wave velocity.

TL;DR: In this paper, the authors used a dual laterolog (DLL) resistivity measure to estimate fracture parameters in a well in one of the Iranian fractured reservoirs, which is based on electrical resistivity anomalies resulting from the separation of shallow and deep laterolog curves.

TL;DR: In this paper, instead of inverting the individual frequencies independently, a scheme where adjacent frequencies are constrained to each other is introduced, where the inversion approach is able to reliably recover the Cole-Cole parameters.

TL;DR: Xiaojihan coal mine is a typical high-intensity mining in Western China as mentioned in this paper, the real-time monitoring of deformation and failure for the working face was carried out by using IMS microseismic monitoring system.

TL;DR: In this article, the effects of anisotropic media on the strengths and the diffusion patterns of time-domain airborne EM responses were modeled by edge-based finite-element method and the Backward Euler scheme was adopted to discretize the timedomain diffusion equation for electric field.

TL;DR: In this article, the authors proposed directional complex-valued coherence attributes through a simple calculation of the cross-correlation between neighboring complex seismic traces normalized by their corresponding envelope within a local time window along a certain spatial direction.

TL;DR: In this paper, a large-scale study of the petrophysical relationship of resistivities obtained from densely sampled ground-based and airborne transient electromagnetic surveys and lithological information from boreholes is presented.

TL;DR: In this article, the average shear wave velocity of the near-surface materials down to a depth of 30m (Vs30) is estimated for Chittagong City using the multichannel analysis of surface waves (MASW), small scale microtremor measurement (SSMM), downhole seismic (DS), and correlation between the Shear Wave velocity (Vs) and standard penetration test blow count (SPT-N).

TL;DR: In this paper, the authors derived the Airborne Induced Polarization (AIP) response of an airborne electromagnetic (AEM) system to a horizontal, thin sheet conductor.

TL;DR: In this article, the authors developed a new method to integrate gravity and gravity gradient data in a 3D density inversion using the nonlinear conjugate gradient (NLCG) method and the minimum gradient support (MGS) functional to regularize the 3D inverse problem and to obtain a clear and accurate image of the anomalous body.

TL;DR: In this article, the spectral induced polarization (SIP) method was used to distinguish different ores in the mine dumps and evaluate the deposited amounts of sulfide in abandoned mine waste dumps.

TL;DR: In this paper, a correction procedure was proposed to remove electrode impedance effects from SIP measurements to improve the accuracy of broadband complex electrical resistivity measurements, where the first step is to estimate the electrode impedance using a measurement with reversed current and potential electrodes.

TL;DR: In this article, a two-parameter generalized S-transform (GST) was employed to obtain the time-frequency spectra of seismic traces, and a non-linear relationship between natural logarithmic spectral ratio and frequency was deduced by ignoring the negligible second order term.