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Exploration Geophysics
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  The Journal of the Australian Society of Exploration Geophysicists
 
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Exploration Geophysics presents case histories, advances in data interpretation, and theoretical developments in applied geophysics. More

Managing Editor: Mark Lackie

 
 
 

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Published online 19 December 2014
A modified excitation amplitude imaging condition for prestack reverse time migration 
Bingluo Gu, Youshan Liu, Xiaona Ma, Zhiyuan Li and Guanghe Liang

We propose a process to effectively use the modified shortest path method for extracting the maximum amplitude around the first-arrival events. Then, the excitation amplitude imaging condition is applied to obtain a continuous and clear migration image. Numerical tests show that the improvement is feasible and effective in complex-structure media.

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Published online 18 December 2014
Kirchhoff prestack migration using the suppressed wave equation estimation of traveltime (SWEET) algorithm in VTI media 
Ho Seuk Bae, Wookeen Chung, Jiho Ha and Changsoo Shin

This paper examines anisotropic prestack Kirchhoff migration using the pseudo-acoustic wave equation in a vertical transversely isotropic (VTI) medium. Both amplitudes and traveltimes were calculated efficiently for migration using the suppressed wave equation estimation of traveltime (SWEET) algorithm.

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Published online 17 December 2014
Estimating primaries from passive seismic data 
Hao Cheng, De-Li Wang, Fei Feng and Heng Zhu

Passive seismic sources can generally be divided into transient and noise sources. We compare the primaries estimated from passive seismic data using transient sources and noise sources, and analyse the characteristics of the estimated primaries obtained from the two sets of passive seismic data.

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Published online 15 December 2014
Case studies of geophysical imaging for road foundation design on soft soils and embankment risk assessment 
Robert J. Whiteley, Richard B. Kelly and Simon B. Stewart

The application of both geophysical imaging and geotechnical testing in road foundation design is a cost-effective enhancement for site characterisation of soft soils and for risk assessment of potentially unstable embankments. The incorporation of geophysics allows concentration on fewer but higher quality soil probings and geotechnical boreholes.

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Published online 08 December 2014
Laboratory modelling of self-potential anomalies due to spherical bodies 
Mohamad Sadegh Roudsari and Ali Beitollahi

This paper presents the experimental design and modelling of self-potential anomalies produced by a sphere-shaped copper–zinc source using a water tank and polarising electrodes. Self-potentials were measured by placing the sphere at a given depth in a rectangular glass tank filled with water.

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Published online 25 November 2014
Deblending using a space-varying median filter 
Yangkang Chen

In this paper, I propose to use a space-varying median filter (SVMF) to remove blending noise. I demonstrate that this filtering method preserves more useful seismic reflection than does the conventional version of a median filter (MF). SVMF can be regionally adaptive, instead of rigidly using a constant window length through the whole profile for filtering.

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Published online 20 November 2014
Rapid approximate inversion of airborne TEM 
Peter K. Fullagar, Glenn A. Pears, James E. Reid and Ralf Schaa

Two algorithms have been developed to perform rapid approximate 3D inversion of airborne TEM. VPem1D performs 1D inversion at each data location above a 3D model. Interpretation of cover thickness is a natural application. VPem3D performs 3D inversion of resistive limit data. Conversion to resistive limits delivers a massive increase in speed. Both programs can operate on geological models to foster integrated interpretation.

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Published online 13 November 2014
mCSEM inversion for CO2 sequestration monitoring at a deep brine aquifer in a shallow sea 
Seogi Kang, Kyubo Noh, Soon Jee Seol and Joongmoo Byun

We developed an efficient 2.5D mCSEM inversion algorithm based on an accurate forward modelling algorithm and the judicious incorporation of a priori information into our inversion scheme. We demonstrated the successful recovery of resistivity distributions of the injected CO2 from the deep brine aquifer model in the shallow sea.

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Published online 12 November 2014
Magnetic depths to basalts: extension of spectral depths method 
Roger Clifton

By assuming that anomalies in a TMI grid arise from thin magnetic layers, spectral depth estimates to one or more equivalent magnetic layers may be obtained repeatedly across large areas. A general formula is derived for the purpose and demonstrated on the TMI grid of the Northern Territory.

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Published online 27 October 2014
Helicopter EM (ZTEM–VTEM) survey results over the Nuqrah copper–lead–zinc–gold SEDEX massive sulphide deposit in the Western Arabian Shield, Kingdom of Saudi Arabia 
Jean M. Legault, Carlos Izarra, Alexander Prikhodko, Shengkai Zhao and Emad M. Saadawi

Magnetic and electromagnetic (EM) results from both time-domain (VTEM and AFMAG (ZTEM) helicopter EM surveys are compared over the Nuqrah sedimentary exhalative (SEDEX) massive sulphide deposit in Saudi Arabia. The magnetic and EM data map major controlling structures but only the EM surveys are able to define the Nuqrah deposits.

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Published online 17 October 2014
Not extinct yet: innovations in frequency domain HEM triggered by sea ice studies 
Andreas A. Pfaffhuber and Stefan Hendricks

Operational use of frequency domain HEM for sea ice thickness mapping was the driving force for developing new purpose-designed systems. We present improvements in decreasing noise levels by one to two orders of magnitude, and implemented control signals to eliminate system drift. Ground tests and airborne field data confirmed the achievement of these goals.

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Published online 15 October 2014
Modelling an arbitrarily oriented magnetic dipole over a homogeneous half-space for a rapid topographic correction of airborne EM data 
Julien Guillemoteau, Pascal Sailhac and Mickael Behaegel

In mountainous areas, the airborne electromagnetic system can be at an angle with regard to the ground. We analyse how the data and the eddy current are affected in such a context. We also suggest a simple correction for the data and for the sensitivity function that reduces topography effects.

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Published online 08 October 2014
New developments in AEM discrete conductor modelling and inversion 
Marc A. Vallée

In the last 20 years, sphere and plate models have been integrated in parametric inversion programs which are used today for interactive interpretation of airborne electromagnetic surveys on powerful workstations. Different problems encountered in the implementation and application of these models are discussed and a case history from Abitibi, Canada, is presented.

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Published online 01 October 2014
Airborne electromagnetic modelling options and their consequences in target definition 
Alan Yusen Ley-Cooper, Andrea Viezzoli, Julien Guillemoteau, Giulio Vignoli, James Macnae, Leif Cox and Tim Munday

Given the range of geological conditions under which airborne EM surveys are conducted, there is an expectation that 2D and 3D methods used to extract models of geological significance would be favoured over 1D inversion and transforms. We analyse data from the Musgrave province, South Australia, used for mineral and for hydro-geological prospecting.

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Published online 01 October 2014
Developing an efficient modelling and data presentation strategy for ATDEM system comparison and survey design 
Magdel Combrinck

A proposal to simplify the display of ATDEM responses through the concept of a three-dimensional signal:noise nomo-volume is presented. It contains the signal:noise values of all system time channels and components for various target depths and conductances integrated into a single interactive three-dimensional image.

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Published online 25 September 2014
MULTIPULSE – high resolution and high power in one TDEM system 
Tianyou Chen, Greg Hodges and Philip Miles

The MULTIPULSE technology airborne TEM system transmits a high power pulse and low power pulse(s) (trapezoid or square) within a half-cycle. The high power pulse ensures good depth of exploration and the low power pulse allows higher near-surface resolution and better sensitivity to weak conductors as confirmed by field results.

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Published online 24 September 2014
Extending the range of time constants recorded by the SPECTREM AEM system 
Peter B. Leggatt

The Spectrem AEM transmitter has no off-time; secondary signals are recorded at the same time as the transmitter primary. By assuming the secondaries have decayed away by the last window, the signal value is used as an estimate of the primary. The result is underestimation of the secondary amplitudes if the target is highly conductive. This paper describes a method to compute a better estimate of the primary amplitude.

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Published online 11 September 2014
Modelling the superparamagnetic response of AEM data 
Daniel Sattel and Paul Mutton

VTEM data flown at different system elevations across a known sulphide body and surface cover with elevated superparamagnetic (SPM) properties were analysed. The results indicate that SPM responses can be distinguished from deep conductor responses if the vertical AEM gradient is measured, with EM sensors being offset vertically by 2–40 m.

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Published online 11 September 2014
The analysis of ZTEM data across the Humble magnetic anomaly, Alaska 
Daniel Sattel and Ken Witherly

ZTEM data acquired across a magnetic anomaly of almost 30 000 nT were analysed for the presence of a magnetic gradient response and the effects from elevated magnetic susceptibilities. Modelling results indicate distortions in the conductivity structure recovered by 3D inversion when elevated magnetic susceptibility values are ignored during the inversion.

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Published online 09 September 2014
Regional TEMPEST survey in north-east Namibia 
Geoffrey Peters, Gregory Street, Ivor Kahimise and David Hutchins

A regional scale low-cost TEMPEST208 survey in north-east Namibia has provided a geo-electric map of the area, including an indication of Kalahari cover thickness. While there are limitations in terms of detail and depth penetration, the results will assist explorers in selecting areas of shallow cover to reduce costs.

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Published online 08 September 2014
Estimation of surface-wave phase velocity from microtremor observation using an array with a reference station 
Hiroaki Yamanaka, Kei Kato, Kosuke Chimoto and Seiji Tsuno

An interferometric procedure for Rayleigh wave phase velocities from cross correlations of microtremors in an array with a reference station is investigated in this study. After identifying dispersive Rayleigh waves, semblance analysis of the cross correlations was carried out to estimate phase velocities for fundamental and higher-mode Rayleigh waves.

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Published online 08 September 2014
Using the in-line component for fixed-wing EM 1D inversion 
Adam Smiarowski

In conductive areas, the in-line component of an offset transmitter–receiver EM system can be more sensitive to the near-surface than the vertical component. Using estimated noise levels, this paper calculates the expected uncertainty on the inverted parameters of a bathymetry model and compares this to inversion results from field data.

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Published online 04 September 2014
Inverse AVO problem for a stack of layers 
Liliya Malovichko

The problem of estimating thin layered model parameters by amplitude variation with offset (AVO) inversion of prestack seismic data has been studied. An algorithm for solving the prestack inverse AVO problem in the case of multilayered media has been derived. Numerical examples show the accuracy and efficiency of the method.

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Published online 04 September 2014
3D-spectral CDIs: a fast alternative to 3D inversion? 
James Macnae

Spectral 3D approximations of the EM response can efficiently model vortex induction and current gathering for simple geological target geometries. This paper presents results of a spectral model fitting algorithm to automatically pick, locate and define a sulphide target from VTEM data at the Forrestania test range, Western Australia.

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Published online 06 August 2014
Accelerating seismic interpolation with a gradient projection method based on tight frame property of curvelet 
Jingjie Cao, Yanfei Wang and Benfeng Wang

A gradient projection method for seismic interpolation based on the tight frame property of curvelet transform is proposed. Some smooth L1 norm functions were analysed, and the Huber function was chosen to replace the L1 norm. The tight frame property of the curvelet transform is utilised to improve the computational efficiency.

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Published online 29 July 2014
An overview of a highly versatile forward and stable inverse algorithm for airborne, ground-based and borehole electromagnetic and electric data 
Esben Auken, Anders Vest Christiansen, Casper Kirkegaard, Gianluca Fiandaca, Cyril Schamper, Ahmad Ali Behroozmand, Andrew Binley, Emil Nielsen, Flemming Effersø, Niels Bøie Christensen, Kurt Sørensen, Nikolaj Foged and Giulio Vignoli

We present an overview of a mature and general algorithm for inversion of most electromagnetic and geoelectrical data, ground-based and airborne. The implementation uses a 1D formulation for electromagnetics and MRS responses, geoelectric responses are 1D and 2D, and the 3D sheet’s response implements an overburden of varying thickness and resistivity.

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Published online 21 July 2014
Geobandwidth: comparing time domain electromagnetic waveforms with a wire loop model 
Greg Hodges and Tianyou Chen

The effect of time domain EM waveform, power and receiver sampling times are effectively compared for a wide range of time constants using a wire loop conductor model. Peak time constant and equivalent frequency can be determined analytically or numerically. Arbitrary waveforms can be modelled as a sum of simple short ramps.

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Published online 17 July 2014
First application of airborne gravity to oil exploration in the Shengli oil province, eastern China 
Wenyong Li, Jianxin Zhou, Yanxu Liu and Jianchun Xu

An airborne gravity survey was successfully conducted over the onshore and offshore regions of the south-west Bohai Sea. The derived Bouguer gravity data and inversed results correlate well with features such as known faults, swells, sags, and oilfields identified by earlier seismic survey and drilling data.

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Published online 26 June 2014
Edge enhancement of potential field data using an enhanced tilt angle 
Xu Zhang, Peng Yu, Rui Tang, Yang Xiang and Chong-Jin Zhao

An edge-detection technique for the enhancement of potential field data, which is based on the tilt angle of the first order vertical derivative of the total horizontal gradient, is presented. The new filter clearly enhances the edges of superimposed sources sharply and generates more subtle detail.

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Published online 03 June 2014
Comments on: Christensen, N., and Lawrie, K., 2012. Resolution analyses for selecting an appropriate airborne electromagnetic (AEM) system, Exploration Geophysics, 43, 213–227 
Adam Smiarowski and Shane Mulè

The AEM in-line component is added to the posterior model covariance matrix analysis done by Christensen and Lawrie, who estimated resolution of data in an inversion program. They compared two AEM systems: SkyTEM and CGG’s TEMPEST™. Here, we clarify points made about TEMPEST™ and extend the analysis to include the in-line component.

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Published online 03 June 2014
Response to comments by Adam Smiarowski and Shane Mulè on: Christensen, N., and Lawrie, K., 2012. Resolution analyses for selecting an appropriate airborne electromagnetic (AEM) system, Exploration Geophysics, 43, 213–227 
Niels B. Christensen and Ken Lawrie

We analyse and compare the resolution improvement that can be obtained from including x-component data in the inversion of AEM data from the SkyTEM and TEMPEST systems. Except for the resistivity of the bottom layer, the SkyTEM system, even without including x-component data, has the better resolution of the parameters of the analysed models.

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Published online 14 May 2014
Radiowave imaging research (RIM) for determining the electrical conductivity of the rock in borehole section OL-KR4-OL-KR10 at Olkiluoto, Finland 
Arto Korpisalo and Eero Heikkinen

The radiowave imaging method (RIM) was tested in the possible area for a repository of spent nuclear fuel in Finland to reveal the properties of granitic bedrock. The detected low and high resistivity zones and their apparent shapes and orientations are in fair agreement with geological and other geophysical results.

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Published online 13 May 2014
Changes in P-wave velocity with different full waveform sonic transmitter centre frequency 
Majed Almalki, Brett Harris and J. Christian Dupuis

We have studied the concept of apparent P-wave dispersion and its implications in shallow, moderately consolidated to unconsolidated sandstones. Although quantitative results of apparent P-wave dispersion were difficult to obtain from the field data, it is reasonably clear that small-scale structures are significant factors in determining variations in velocity dispersion.

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Published online 30 April 2014
Implementation of adaptive edge-preserving smoothing regularisation technique for simultaneous multi-frequency full waveform inversion 
Yunhui Park and Sukjoon Pyun

An adaptive smoothing regularisation method for full waveform inversion is proposed. The proposed regularisation method is designed using the local slope and implemented in the form of a preconditioning filter for pure-gradient-based full waveform inversion. It can yield more reliable and precise inverted results compared with conventional regularisation.

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Published online 22 April 2014
Memoryless quasi-Newton (MLQN) method for 2D acoustic full waveform inversion 
Cai Liu, Fengxia Gao, Xuan Feng, Yang Liu and Qianci Ren

In this paper, a memoryless quasi-Newton (MLQN) method is applied in full waveform inversion to invert velocity from surface seismic data for the first time. This method can attain acceptable results with low computation cost and small memory storage requirements. Synthetic model tests show that the MLQN method is feasible and reliable.

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Published online 16 April 2014
Comparison of numerical dispersion in acoustic finite-difference algorithms 
Wen-Quan Liang, Yan-Fei Wang and Chang-Chun Yang

Different methods were developed to suppress the grid dispersion in numerical simulation of the acoustic wave equation. This paper compares the performance of these methods in the space and time–space domains. Dispersion analysis and numerical simulation indicate that a linear method without iteration performs comparably to the optimised methods.

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Published online 09 April 2014
Iterative reweighted least M-estimate AVO inversion 
Yang Liu, Jiashu Zhang and Guangmin Hu

In this paper, an IRLM algorithm which uses Hampel’s three-part redescending M-estimate function as the misfit measure is proposed for robust AVO inversion. By combining the advantages of the Huber norm and biweight norm, the proposed IRLM algorithm performs better in the complex noise environment.

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Published online 18 March 2014
Gaussian beam prestack depth migration in heterogeneous transversely isotropic media 
Jianguang Han and Yun Wang

Based on anisotropic kinematic and dynamic ray tracing systems, an anisotropic Gaussian beam prestack depth migration method for P-wave data in transversely isotropic media is presented in this paper. Tests of synthetic and field seismic data demonstrate that the method is accurate and efficient.

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blank image Exploration Geophysics
Volume 45 Number 4 2014
Featuring papers from the ASEG-PESA 23rd International Geophysical Conference & Exhibition, August 2013 Remanence Forum

 
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Table of Contents 
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Mapping pollution and coastal hydrogeology with helicopterborne transient electromagnetic measurements 
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Niels B. Christensen and Max Halkjær
pp. 243-254

We present a helicopterborne transient electromagnetic survey from a region at the North Sea coast in western Jutland, Denmark, carried out at a seriously polluted site with the dual purpose of assessing the extent of the pollution and mapping the coastal hydrogeology to provide data for remediation activities.

 
  
 

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Least squares staggered-grid finite-difference for elastic wave modelling 
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Lei Yang , Hongyong Yan and Hong Liu
pp. 255-260

In this paper, we derive the staggered-grid finite-difference coefficients of arbitrary even-order accuracy for the first-order spatial derivatives by the dispersion relation and the least squares method, which can satisfy the specific numerical solution accuracy of the derivative on a wide frequency zone for elastic wave numerical modelling.

 
  
 

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Evaluation of structural and geological factors in orogenic gold type mineralisation in the Kervian area, north-west Iran, using airborne geophysical data 
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Alireza Almasi , Alireza Jafarirad , Hasan Kheyrollahi , Mana Rahimi and Peyman Afzal
pp. 261-270

This paper introduces exploration clues for orogenic gold prospecting in the north-west of the Sanandaj-Sirjan metamorphic zone, north-west Iran. These are derived based on processing and interpreting airborne magnetic and radiometric data in order to identify favourable host rocks, and surface and subsurface structures.

 
  
 

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Methods for determining remanent and total magnetisations of magnetic sources – a review 
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David A. Clark
pp. 271-304

Assuming without evidence that magnetic sources are magnetised parallel to the geomagnetic field can seriously mislead interpretation and can result in drillholes missing their targets. This paper reviews methods that are available for estimating the natural remanent magnetisation and total magnetisation of magnetic sources, noting the strengths and weaknesses of each approach.

 
  
 

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Practical considerations: making measurements of susceptibility, remanence and Q in the field 
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Phillip W. Schmidt and Mark A. Lackie
pp. 305-313

The measurement of magnetic susceptibility, magnetic remanence and Königsberger ratios can be made in the field, either using a total field magnetometer or a new portable fluxgate device that is described. Various problems of using a magnetic susceptibility meter on non-ideal rock, core and chip samples can be avoided.

 
  
 

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Remote remanence estimation (RRE) 
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David A. Pratt , K. Blair McKenzie and Tony S. White
pp. 314-323

The resultant magnetisation vector of a compact magnetic source can be obtained through simultaneous inversion for geometry and magnetisation. The resultant magnetisation vector and induced field vector lie on a plane that intersects the transformed apparent polar wander path to provide estimates for magnetic remanence, susceptibility and age.

 
  
 

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Corrigendum to: New methods for interpretation of magnetic vector and gradient tensor data I: eigenvector analysis and the normalised source strength 
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David A. Clark
pp. 324-324
 
 |    Corrigendum PDF (1.1 MB) - $25.00  
 

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These articles have been peer reviewed and accepted for publication. They are still in production and have not been edited, so may differ from the final published form.

    EG14123  Accepted 12 December 2014
    Calculation of Gravity due to Vertical a Cylinder using a Spherical Harmonic Series and Numerical Integration
    Sung-Ho Na, Hyoungrea Rim, Young-Hong Shin, Mutaek Lim, Yeong-Sue Park
    Abstract


    EG14116  Accepted 19 November 2014
    Direct Simulation Monte Carlo Method with a Focal Mechanism Algorithm
    Asep Nur Rachman, Tae Woong Chung, Kazuo Yoshimoto, Sukyoung Yun
    Abstract


    EG14084  Accepted 09 December 2014
    3D UNCONSTRAINED AND GEOLOGICALLY CONSTRAINED STOCHASTIC INVERSION OF AIRBORNE VERTICAL GRAVITY GRADIENT DATA
    Euloge TCHIKAYA, Michel Chouteau, Pejman Shamsipour, Pierre Keating
    Abstract


    EG14113  Accepted 12 November 2014
    Imaging Tilted Transversely Isotropic Media with a Generalized Screen Propagator
    Sung-il Shin, Joongmoo Byun, Soon Jee Seol
    Abstract


    EG14111  Accepted 12 November 2014
    Identification of leachate from livestock mortality burial using electrical resistivity and small-loop EM survey: case history
    Sung-Ho Song, In-Ky Cho, Kwang-Jun Choi
    Abstract


    EG14066  Accepted 06 November 2014
    INTEGRATED INTERPRETATION OF OVERLAPPING AEM DATASETS ACHIEVED THROUGH STANDARDISATION
    Camilla Sørensen, Tim Munday, Graham Heinson
    Abstract


    EG14105  Accepted 21 October 2014
    6th International Conference in Airborne Electromagnetics (AEM 2013),
    Aaron Davis
    Abstract


    EG14050  Accepted 08 June 2014
    Errata for Clark, D.A., 2012. New methods for interpretation of magnetic vector and gradient tensor data I: eigenvector analysis and the normalised source strength. Exploration Geophysics, 43, 267–282, http://dx.doi.org/10.1071/EG12020.
    David Clark
    Abstract




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Rank Paper Details
1. Published 5 September 2014
Optimised edge detection filters in the interpretation of potential field data

Lili Li, Danian Huang, Liguo Han and Guoqing Ma

2. Published 14 March 2014
Grounded electrical-source airborne transient electromagnetics (GREATEM) survey of Aso Volcano, Japan

Hisatoshi Ito, Hideshi Kaieda, Toru Mogi, Akira Jomori and Youichi Yuuki

3. Published 30 May 2014
A combinatorial filtering method for magnetotelluric time-series based on Hilbert–Huang transform

Jianhua Cai

4. Published 28 November 2014
Methods for determining remanent and total magnetisations of magnetic sources – a review

David A. Clark

5. Published 14 March 2014
Three-dimensional resistivity modelling of grounded electrical-source airborne transient electromagnetic (GREATEM) survey data from the Nojima Fault, Awaji Island, south-east Japan

Sabry Abd Allah, Toru Mogi, Hisatoshi Ito, Akira Jymori, Youichi Yuuki, Elena Fomenko, Kenzo Kiho, Hideshi Kaieda, Koichi Suzuki and Kazuhiro Tsukuda

6. Published 5 September 2014
Prediction and removal of rotation noise in airborne EM systems

Terence Kratzer and James Macnae

7. Published 5 September 2014
A description of seismic amplitude techniques

James Shadlow

8. Published 5 September 2014
Bathymetry, electromagnetic streamlines and the marine controlled source electromagnetic method

Andrew Pethick and Brett Harris

9. Published 14 March 2014
Radiation monitoring using an unmanned helicopter in the evacuation zone around the Fukushima Daiichi nuclear power plant

Yukihisa Sanada, Atsuya Kondo, Takeshi Sugita, Yukiyasu Nishizawa, Youichi Yuuki, Kazutaka Ikeda, Yasunori Shoji and Tatsuo Torii

10. Published 28 November 2014
Practical considerations: making measurements of susceptibility, remanence and Q in the field

Phillip W. Schmidt and Mark A. Lackie

11. Published 28 November 2014
Least squares staggered-grid finite-difference for elastic wave modelling

Lei Yang, Hongyong Yan and Hong Liu

12. Published 28 November 2014
Evaluation of structural and geological factors in orogenic gold type mineralisation in the Kervian area, north-west Iran, using airborne geophysical data

Alireza Almasi, Alireza Jafarirad, Hasan Kheyrollahi, Mana Rahimi and Peyman Afzal

13. Published 30 May 2014
Application of high resolution airborne geophysical data in geological modelling of Mohar Cauldron Complex, Bundelkhand Massif, central India: implications for uranium exploration

A. Markandeyulu, A. K. Chaturvedi, B. V. S. N. Raju, P. S. Parihar, Roger Miller and Glenn Gooch

14. Memoryless quasi-Newton (MLQN) method for 2D acoustic full waveform inversion

Cai Liu, Fengxia Gao, Xuan Feng, Yang Liu and Qianci Ren

15. Published 30 May 2014
Perfectly matched layer on curvilinear grid for the second-order seismic acoustic wave equation

Sanyi Yuan, Shangxu Wang, Wenju Sun, Lina Miao and Zhenhua Li

16. Published 28 November 2014
Mapping pollution and coastal hydrogeology with helicopterborne transient electromagnetic measurements

Niels B. Christensen and Max Halkjær

17. Published 30 May 2014
Numerical simulation using a Hamiltonian particle method for effective elastic properties in cracked media

Junichi Takekawa, Hitoshi Mikada and Tada-nori Goto

18. Comparison of numerical dispersion in acoustic finite-difference algorithms

Wen-Quan Liang, Yan-Fei Wang and Chang-Chun Yang

19. Published 14 March 2014
Aeromagnetic survey using an unmanned autonomous helicopter over Tarumae Volcano, northern Japan

Takeshi Hashimoto, Takao Koyama, Takayuki Kaneko, Takao Ohminato, Takatoshi Yanagisawa, Mitsuhiro Yoshimoto and Eiichi Suzuki

20. Published 30 May 2014
Discovery of a surface wave velocity anomaly in the West Sea of South Korea

Kwang Hyun Cho


      
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