Showing papers in "Journal of Applied Geophysics in 2000"

TL;DR: A status report of ground-penalizing radar (GPR) highway applications is provided in this paper based on studies conducted in both Scandinavia and the USA, where ground-coupled and air-launched GPR systems together with a discussion of both signal processing and data interpretation techniques are discussed.

TL;DR: In this paper, a tracer was injected into a tank facility (dimensions 10×10×3 m) consisting of alternating sand and clay layers and the pixels that make up the electrical images were interpreted as a large number of breakthrough curves.

TL;DR: In this paper, the utility and resolution of different geoelectrical methods in mapping contaminant distribution in the subsurface, and provides a window into the processes that may control their response at a site in Central Michigan.

TL;DR: The task of locating buried utilities using ground penetrating radar is addressed, and a novel processing technique computationally suitable for on-site imaging is proposed, which indicates that automatic and effective detection and mapping of such structures can be achieved in near real-time.

TL;DR: In this article, a different model is developed which treats these spills as dynamic, changing systems dominated by surprisingly low resistivities, and the major geophysical response of a mature or established spill of this type is due to an anomalously low resistivity zone in the lower vadose zone and upper portion of the aquifer.

TL;DR: In this paper, a slow and local phenomenon of subsidence caused by underground coal mining has been observed near Gardanne, France, from images acquired by both European ERS-1/ERS-2 satellites between 1992 and 1995.

TL;DR: In this paper, ground penetrating radar data is not always easy to acquire, and sometimes the acquisition may be constrained by equipment availability, weather, legal or logistical constraints, safety or access considerations.

TL;DR: In this paper, the results from some geoelectrical surveys carried out to monitor the spread of contamination in underlying aquifers due to a landfill site were reported, employing the DC resistivity and time domain induced polarisation (IP) methods.

TL;DR: In this paper, a conceptual resistivity-vs-depth model for old/abandoned landfill sites where the records of operations are not available is developed. But the model is not suitable for the analysis of underground landfills.

TL;DR: In this paper, the authors analyzed the spatial distribution of soft soils in a valley with a significant amount of recently accumulated.Late Pleistocene-Holocene sediments, but where the available geotechnical information on the subsurface is inadequate to study the entire valley.

TL;DR: The backscattered fields from cylinders may be strongly depolarized depending on the orientation of cylinders relative to the antennas, the electrical properties of the cylinders, and the radius of the cylinder compared to the incident wavelength.

TL;DR: In this paper, ground-penetrating radar (GPR) techniques have been tested on the same site in order to establish the performance and reliability of this method when applied to civil-engineering problems.

TL;DR: The ground-penetrating radar (GPR) survey performed inside the Cathedral of Valencia, Spain is described in this article, which is part of historical studies performed in the cathedral in order to add information to old maps and documents in the Cathedral Archives and also to analyze the extent and importance of potentially destructive moisture areas that were appearing on the floor.

TL;DR: In this article, the authors evaluated the benefits and limits of GPR railway track inspections, three GPR surveys were carried out on three different railway lines, and the positioning of some of the trench locations was based on preliminary GPR results in order to support the interpretation of radar data.

TL;DR: A ground-penetrating radar (GPR) survey, using mostly a 500 MHz antenna, was carried out in an urban area (Lecce, Italy) to obtain a detailed characterization of the most superficial layers, where presumably archaeological structures are buried, and to quickly identify anomalous zones for excavation as mentioned in this paper.

TL;DR: In this paper, the authors provide an overview of the current status of seismic monitoring instrumentation employed in Canadian underground mines, and outline how passive seismic monitoring techniques are being used to evaluate fractures and stress conditions associated with ore extraction at depth.

TL;DR: In this article, the ability of a block inversion scheme in determining the geometry and true resistivity of subsurface structures has been investigated and a simple strategy for deriving the starting model is proposed.

TL;DR: In this article, the relative dielectric constant ratio at interface boundaries where the radar wave is traveling from a low-velocity to a highvelocity medium is determined using Brewster angle analysis.

TL;DR: In this article, the authors simulate ground-penetrating radar (GPR) responses from models of buried human remains and suggest the potential of GPR for detailed non-destructive forensic site investigation.

TL;DR: In this paper, ground-penetrating radar (GPR) experiments were conducted on a Quaternary sedimentary (made up of gravel, sand and loess) site to image the structures and tectonic features.

TL;DR: A cluster of hot springs in Bakreswar geothermal area, which belongs to the Chotanagpur Gneissic Complex in the eastern part of Peninsular India, is characterised by varying temperature and similar chemical composition.

TL;DR: In this article, the ability of several practical ground-penetrating radar (GPR) array processing methods to improve signal-to-noise ratio (SNR), increase depth of signal penetration, and suppress out-of-plane arrivals for data with SNR of roughly 1.

TL;DR: In this article, the hydraulic properties including porosity and permeability of fractured rock masses are estimated from seismic velocities derived from controlled numerical experiments, and the velocity ratio between the fractured and the intact rock correlates with hydraulic properties.

TL;DR: In this article, electrical resistivity profiling and natural gamma ray intensity measurements were made over the karst features (subsurface flow-channels, solution cavities, sinkholes) in the Pokhara valley, central Nepal.

TL;DR: In this article, a model of wave propagation in fluid-saturated porous media is developed where the principal fluid/solid interaction mode affecting the propagation of the acoustic wave results from the conjunction of the Biot and the Squirt flow mechanism.

TL;DR: In this article, an electromagnetic radiation (EMR) method associated with rock fracture was employed to study water infusion in rockburst-prone coal strata, which revealed that a hole nearing a stress peak excites a sharp increase in EMR activity.

TL;DR: The ability of the VLF-R (Resistivity) method to provide quantitative subsurface resistivity information is examined in this article, where the authors use a regularised inversion technique for the quantitative assessment of the data.

TL;DR: In this paper, a ground penetrating radar system with a novel Good Impedance Match Antenna (GIMA) was evaluated for concrete structural assessment, which has the capacity to detect concrete cracks as small as 1 mm thick, while being able to reflect from and detect features at depths of up to 360 mm.

TL;DR: In this article, a finite element (FE) method for magnetotelluric modeling of three-dimensional conductivity structures is presented, where the equations are treated as a system of first-order partial differential equations for the secondary fields.

TL;DR: In this paper, the Borden data set is used to demonstrate how advanced visualization can assist in the interpretation of raw and processed data, and the combination of these reflectivity changes (between different combinations of the 3D subsets of the 4D data set) are used to create a model of hydrogeological properties.