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Long-Wave Elastic Anisotropy Produced by Horizontal Layering

- G. Backus
- Geology
- 1 October 1962

A horizontally layered inhomogeneous medium, isotropic or transversely isotropic, is considered, whose properties are constant or nearly so when averaged over some vertical height l′. For waves… Expand

The Resolving Power of Gross Earth Data

- G. Backus, F. Gilbert
- Geology, Mathematics
- 1 October 1968

A gross Earth datum is a single measurable number describing some property of the whole Earth, such as mass, moment of interia, or the frequency of oscillation of some identified… Expand

Foundations of geomagnetism

- G. Backus, R. Parker, C. Constable
- Physics, Geology
- 1996

Preface 1. General facts about the main field 2. Classical electrodynamics 3. Spherical harmonics 4. Gauss' theory of the main field 5. The Mie representation 6. Hydromagnetics of the core 7.… Expand

Uniqueness in the inversion of inaccurate gross Earth data

- G. Backus, F. Gilbert
- Mathematics, GeologyPhilosophical Transactions of the Royal Society…
- 5 March 1970

A gross Earth datum is a single measurable number describing some property of the whole Earth, such as mass, moment of inertia, or the frequency of oscillation of some identified… Expand

Possible forms of seismic anisotropy of the uppermost mantle under oceans

- G. Backus
- Geology
- 15 July 1965

The apparent body wave velocities υP of the oceanic mantle immediately below the Mohorovicic discontinuity (M), obtained from oceanic refraction shooting, can depend on azimuth ϕ; because of real… Expand

Poloidal and toroidal fields in geomagnetic field modeling

- G. Backus
- Physics
- 1 February 1986

The theory of surface operators is described and applied to four surface operators on spheres: the dimensionless surface gradient, ▽1=r▽-r∂r; the dimensionless surface curl, Λ1=rˆ×▽1; the… Expand

A geometrical picture of anisotropic elastic tensors

- G. Backus
- Geology
- 1 August 1970

A geometrical picture of fourth-order, three-dimensional elastic tensors in terms of Maxwell multipoles is developed and used to obtain the elastic tensors appropriate to various crystal symmetry… Expand

Kinematics of geomagnetic secular variation in a perfectly conducting core

- G. Backus, E. Bullard
- GeologyPhilosophical Transactions of the Royal Society…
- 19 September 1968

The motions in the Earth’s electrically conducting fluid core which are the probable cause of the geomagnetic secular variations have time scales of the order of a few centuries or less. Seismic… Expand

Numerical Applications of a Formalism for Geophysical Inverse Problems

- G. Backus, J. Gilbert
- Geology, Mathematics
- 1 July 1967

Summary
A gross datum of the Earth is a single measurable number describing some property of the whole Earth, such as mass, moment of inertia, or the frequency of oscillation of some identified… Expand

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