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difference principle

Overview page. Subjects: Philosophy.

The principle chosen by rational people from behind the veil of ignorance, in Rawls's A Theory of Justice. The principle requires that social benefits and burdens are allocated in such a...

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very-long-baseline interferometry

Peter Clarke.

in The Oxford Companion to the Earth

January 2000; p ublished online January 2003 .

Reference Entry. Subjects: Earth Sciences and Geography. 556 words.

The basic principle of very-long-baseline interferometry (VLBI) is that the difference in time between the arrival of a

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feminist geography

Overview page. Subjects: Earth Sciences and Geography.

Feminist geographies are concerned with the relationships between gender relations and space—how space impacts upon gender relations, and how gender relations express themselves spatially....

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A modified imaging principle for true‐amplitude wave‐equation migration

D. Kiyashchenko, R.‐E. Plessix, B. Kashtan and V. Troyan.

in Geophysical Journal International

March 2007; p ublished online March 2007 .

Journal Article. Subjects: Geophysics. 5835 words.

SUMMARY

A modified imaging principle is proposed in order to retrieve the ‘true amplitude’ map of the relative slowness perturbations from multishot surface...

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Calculating the two-dimensional magnetotelluric Jacobian in finite elements using reciprocity

Patricia Pastana de Lugão and Philip E. Wannamaker.

in Geophysical Journal International

December 1996; p ublished online December 1996 .

Journal Article. Subjects: Geophysics. 0 words.

Summary

To speed up the calculation of the field Jacobian for 2-D magnetoteliuric inversion using finite elements, the principle of electromagnetic...

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A distribution-based parametrization for improved tomographic imaging of solute plumes

Adam Pidlisecky, Kamini Singha and Frederick D. Day-Lewis.

in Geophysical Journal International

October 2011; p ublished online October 2011 .

Journal Article. Subjects: Geophysics. 7045 words.

Summary

Difference geophysical tomography (e.g. radar, resistivity and seismic) is used increasingly for imaging fluid flow and mass transport associated...

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GRACE time-variable gravity field recovery using an improved energy balance approach

Kun Shang, Junyi Guo, C.K. Shum, Chunli Dai and Jia Luo.

in Geophysical Journal International

P ublished online October 2015 .

Journal Article. Subjects: Geodesy and Surveying for Maps and Charts. 11703 words.

A new approach based on energy conservation principle for satellite gravimetry mission has been developed and yields more accurate estimation of in situ geopotential difference observables...

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Rapid full-wave centroid moment tensor (CMT) inversion in a three-dimensional earth structure model for earthquakes in Southern California

En-Jui Lee, Po Chen, Thomas H. Jordan and Liqiang Wang.

in Geophysical Journal International

July 2011; p ublished online July 2011 .

Journal Article. Subjects: Geophysics. 9145 words.

Summary

A central problem of seismology is the inversion of regional waveform data for models of earthquake sources. In regions such as Southern California,...

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Ground deformation in a viscoelastic medium composed of a layer overlying a half-space: a comparison between point and extended sources

Arnau Folch, José Fernández, John B. Rundle and Joan Martí.

in Geophysical Journal International

January 2000; p ublished online January 2000 .

Journal Article. Subjects: Geophysics. 6892 words.

Summary

We obtain and compare analytical and numerical solutions for ground displacement caused by an overpressurized magma chamber placed in a linear...

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Time domain Gauss—Newton seismic waveform inversion in elastic media

Dong-Hoon Sheen, Kagan Tuncay, Chang-Eob Baag and Peter J. Ortoleva.

in Geophysical Journal International

December 2006; p ublished online December 2006 .

Journal Article. Subjects: Geophysics. 7159 words.

Summary

We present a seismic waveform inversion methodology based on the Gauss—Newton method from pre-stack seismic data. The inversion employs a...

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Characterization of dispersive surface waves using continuous wavelet transforms

M. Holschneider, M. S. Diallo, M. Kulesh, M. Ohrnberger, E. Lück and F. Scherbaum.

in Geophysical Journal International

November 2005; p ublished online November 2005 .

Journal Article. Subjects: Geophysics. 7647 words.

Summary

In this paper, we propose a method of surface waves characterization based on the deformation of the wavelet transform of the analysed signal. An...

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Simulating shear wave propagation in two-dimensional fractured heterogeneous media by coupling boundary element and finite difference methods

Tianrun Chen, Junlun Li and Nafi Toksöz.

in Geophysical Journal International

September 2013; p ublished online June 2013 .

Journal Article. Subjects: Geophysics. 6517 words.

A hybrid method to model the shear (SH) wave scattering from 2-D fractures embedded in a heterogeneous medium is developed by coupling the boundary element method (BEM) and the finite...

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Surface wave tomography: global membrane waves and adjoint methods

D. Peter, C. Tape, L. Boschi and J. H. Woodhouse.

in Geophysical Journal International

December 2007; p ublished online December 2007 .

Journal Article. Subjects: Geophysics. 10589 words.

Summary

We implement the wave equation on a spherical membrane, with a finite-difference algorithm that accounts for finite-frequency effects in the...

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Sensitivity and inversion of borehole flexural dispersions for formation parameters

Bikash K. Sinha.

in Geophysical Journal International

January 1997; p ublished online January 1997 .

Journal Article. Subjects: Geophysics. 0 words.

Propagation characteristics of borehole flexural waves are functions of five borehole, fluid and formation parameters. Uncertainties in any of these model parameters may introduce errors in...

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An experiment of muon radiography at Mt Etna (Italy)

Daniele Carbone, Dominique Gibert, Jacques Marteau, Michel Diament, Luciano Zuccarello and Emmanuelle Galichet.

in Geophysical Journal International

February 2014; p ublished online October 2013 .

Journal Article. Subjects: Geophysics. 7945 words.

Interactions of conduit geometry with gas–liquid flows control volcanic activity, implying that the evaluation of volcanic hazards requires quantitative understanding of the inner structure...

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Spectral modification of seismic waves propagating through solids exhibiting a resonance frequency: a 1-D coupled wave propagation–oscillation model

Marcel Frehner, Stefan M. Schmalholz and Yuri Podladchikov.

in Geophysical Journal International

February 2009; p ublished online February 2009 .

Journal Article. Subjects: Geophysics. 8106 words.

Summary

A 1-D model is presented that couples the microscale oscillations of non-wetting fluid blobs in a partially saturated poroelastic medium with the...

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A comparison of the gravity field over Central Europe from superconducting gravimeters, GRACE and global hydrological models, using EOF analysis

David Crossley, Caroline de Linage, Jacques Hinderer, Jean-Paul Boy and James Famiglietti.

in Geophysical Journal International

May 2012; p ublished online May 2012 .

Journal Article. Subjects: Geophysics. 12566 words.

Summary

We analyse data from seven superconducting gravimeter (SG) stations in Europe from 2002 to 2007 from the Global Geodynamics Project (GGP) and compare...

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Non-linear inversion of scattered seismic surface waves

Xander Campman and Christina Dwi Riyanti.

in Geophysical Journal International

December 2007; p ublished online December 2007 .

Journal Article. Subjects: Geophysics. 6018 words.

Summary

Seismic surface wave analysis has provided important insight in the Earth's crustal and upper mantle structure and has recently become a standard...

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Postmodernism and Poststructuralism

Martin Phillips.

in Geography

P ublished online October 2016 .

Article. Subjects: Earth Sciences and Geography; Human Geography. 10260 words.

In academic geography, the terms “postmodernism” and “poststructuralism” appeared respectively in the mid- to late 1980s and early 1990s, although circulated in other disciplines and...

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Theoretical free-oscillation spectra: the importance of wide band coupling

Arwen Deuss and John H. Woodhouse.

in Geophysical Journal International

September 2001; p ublished online September 2001 .

Journal Article. Subjects: Geophysics. 5324 words.

Summary

Illustrative calculations are presented of the effect of the coupling of large groups of Earth's normal modes in a realistic 3-D earth model. In...

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Gravitational stability computed through the limit equilibrium method revisited

Stefano Tinti and Anna Manucci.

in Geophysical Journal International

January 2006; p ublished online January 2006 .

Journal Article. Subjects: Geophysics. 8798 words.

Summary

The stability of slopes is a problem of great relevance for geologists and geophysicists as well as for geotechnical and geoenvironmental engineers....

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