Showing papers in "Journal of Applied Geophysics in 2009"

TL;DR: In this article, the authors use Global Atmospheric Models (GAM) to estimate the stratified phase delay and delay-elevation ratio at epochs of SAR acquisitions, and compare them to observed phase delay derived from SAR interferograms.

TL;DR: In this paper, electrical resistivity tomography (ERT) has been used in association with standard penetration test (SPT) and Dynamic Cone Penetration Test (DCPT) for geotechnical investigations at two sites, proposed for thermal power plants, in Uttar Pradesh (UP), India.

TL;DR: In this paper, a small and lightweight, digitally operated frequency-domain electromagnetic-induction (EM) system, a so-called EM bird, dedicated for measurements of sea ice thickness was developed.

TL;DR: A novel experiment of time lapse electrical resistivity tomography (TL-ERT) aimed at monitoring the dynamics of the saltwater intrusion in the coastland bounding the southern Venice Lagoon is presented in this article.

TL;DR: In this paper, the spatial and temporal patterns of the Mexico City subsidence by differential radar interferometry, using 38 ENVISAT images acquired between end of 2002 and beginning of 2007, were analyzed.

TL;DR: In this paper, a brief review of the progress made in the field of radon measurements in earth sciences, specially in predicting earthquakes, is presented, and the models proposed in relating precursor time, epicentral distance, magnitude of earthquake have also been discussed.

TL;DR: In this paper, a least squares inversion algorithm is proposed to allow for the subsurface properties to continuously change in time, and the regularizations not only in the space domain but also in time are introduced to reduce inversion artifacts and improve stability of the inverse problem.

TL;DR: In this article, the authors present an up-to-date picture of the achievements of EM methods for geothermal exploration as they have emerged over the last few years, and prove that EM sounding of geothermal zones and distant monitoring macro-parameters of the reservoirs, fluid-filled faults and other elements of the geothermal system are possible provided that modern 3-D inversion is used along with techniques that reduce the effects of industrial and geological noise.

TL;DR: In this paper, two different airborne electromagnetic methods were applied in the same area: the frequency-domain helicopter-borne electromagnetic (HEM) system operated by the Federal Institute for Geosciences and Natural Resources, Germany, and the time-domain SkyTEM system of the HydroGeophysics Group at the University of Aarhus, Denmark.

TL;DR: In this article, the authors present the main results of the PSI (Persistent Scatterer Interferometry Codes Cross Comparison and Certification for long term differential interferometry (PSIC4) project, based on the validation of PSI data with respect to levelling data on a subsiding mining area near Gardanne, in the South of France.

TL;DR: In this article, a combination scheme of wavelets and curvelets is applied to seismic random denoising by solving an l 1 norm optimization problem, and the combined scheme aims at taking advantage of the respective merits of wavelet and curvelet in order to obtain better effects.

TL;DR: In this paper, a smoothed pseudo Wigner-Ville distribution (SPWVD) with Gauss kernel function was employed to reduce cross-term interference in time and frequency domain, then reassign values of SPWVD according to the center of gravity of the considering energy region.

TL;DR: In this article, an audio-magnetotelluric data-set from the McArthur River uranium mine in the Athabasca Basin was carried out and a sub-set comprising data from eleven frequencies distributed over almost three decades was inverted.

TL;DR: Laterally constrained inversion (LCI) as discussed by the authors has been applied to HEM data combined with the automatic generation of dynamic starting models for high-resolution, three-dimensional resistivity mapping.

TL;DR: In this paper, a geophysical characterization study of a waste rock pile was carried out using ground-penetrating radar, electromagnetic conductivity and DC resistivity imaging to image the internal structure controlling the water flux at shallow depth.

TL;DR: In this paper, both differential SAR Interferometry (DInSAR) and persistent scatterer interference (PSI) are used to estimate surface displacement of the Nord/Pas-de-Calais coal basin during a 15-year period (1992-2007) after the end of 270 years of mining exploitation.

TL;DR: In this article, the authors provide a procedure in order to identify groundwater levels by means of seismic refraction profiles, which is related to the local variations of the P and S wave velocities and, in theoretical terms, it is correlated to groundwater level.

TL;DR: In this article, a 3D modeling study was conducted on a very large electrical resistivity survey conducted at a nuclear waste site in eastern Washington using EarthImager3D (EI3D).

TL;DR: The application of Ground Penetrating Radar (GPR) for the inspection of retaining walls and the approaches to data acquisition and processing are described in the form of the two case studies.

TL;DR: This paper addresses the problem of imaging leaking pipes from single-fold, multi-receiver GPR data by means of a novel microwave tomographic method based on a 2D “distorted” scattering model which incorporates the available knowledge on the investigated scenario (i.e., pipe position and size).

TL;DR: In this paper, a ground-based SAR (GB-SAR) interferometer was employed on the east face of the Mount Rosa to measure the deformation field of the illuminated surface.

TL;DR: In this article, a 3D single component vector migration algorithm was implemented to produce 2D slices of 3D vector migration image by applying the algorithm on line data, which allowed for migrating single component line data taking into account all vector effects as well as three-dimensional wave propagation.

TL;DR: In this paper, the authors present a new type of PSI validation and compare the intermediate data in slant range regarding a reference processing and consequently avoid the problems resulting from the geocoding.

TL;DR: In this article, a multichannel cart system based on a multi-channel radar imaging procedure has been developed and tested within the framework of a large-scale archaeological investigation project in northern Italy.

TL;DR: A geophysical study that involved different techniques was carried out with the aim to improve the knowledge of the archaeological site where the Basilica of Maxentius was founded and to discern individual covered structures (foundations).

TL;DR: In this article, a normalized representation based on theoretical phase velocities and spread length has shown the apparent invariability of near-offset effects: the underestimation occurred as soon as the measured wavelength exceeded 50% of the spread length; homogeneous and normally-dispersive media provide the same limitation, regardless of spread length value.

TL;DR: In this paper, the authors proposed a new approach for modelling the development of instabilities in pyroclastic covers induced by rainfall events, based on high-resolution 2D electrical resistivity tomography (ERT) and on a cellular automaton model aimed to simulate landslide events.

TL;DR: In this article, the authors measured the dependence of permeability and complex electrical resistivity on direction for low-permeable sandstone samples from a tight gas reservoir and measured in three directions at hydrostatic pressures up to 100 MPa.

TL;DR: In this article, a finite-difference (FD) method was used to model the response of a triaxial array induction tool with a multiple-electrode type sleeve.

TL;DR: In this article, ground-penetrating radar (GPR) data across the active Emigrant Peak Fault was collected to image and quantify fault displacement and assess off-fault deformation in an alluvial fan setting.