Earthquake Displacement Fields and the Rotation of the Earth

1. Front Matter

   Pages I-XI

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2. Review

   1. Front Matter

      Pages 1-1

      PDF

   2. Polar Wobble and Drift: A Brief History

      • M. G. Rochester

      Pages 3-13

3. Elasticity Theory of Dislocation

   1. Front Matter

      Pages 15-15

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   2. Earthquake Displacement Fields

      • Michael A. Chinnery

      Pages 17-38

   3. Deformation of a Spherical Earth Model by Finite Dislocations

      • Ari Ben-Menahem, Sarva Jit Singh

      Pages 39-42

4. Present day Measurement and analysis of Rotation and Polar Motion

   1. Front Matter

      Pages 43-43

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   2. Polar Motion in Recent Years

      • S. Yumi

      Pages 45-53

   3. Work of the Bureau international De L’Heure on the Rotation of the Earth

      • Bernard Guinot

      Pages 54-62

   4. Stability of Station and the Earth’s Figure

      • S. Yumi

      Pages 63-68

   5. Sudden Changes in Rotational Acceleration of the Earth and Secular Motion of the Pole

      • W. M. Markowitz

      Pages 69-81

   6. Secular Motion of the Pole

      • S. Yumi, Y. Wako

      Pages 82-87

   7. The Dynamical Coupling Between Inner Core and Mantle of the Earth and the 24-Year Libration of the Pole

      • F. H. Busse

      Pages 88-98

   8. Deconvolution of the Pole Path

      • D. E. Smylie, G. K. C. Clarke, L. Mansinha

      Pages 99-112

5. Excitation of the Chandler Wobble

   1. Front Matter

      Pages 113-113

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   2. Solar activity and the Rotation of the Earth

      • R. J. Jady

      Pages 115-121

   3. Seismic Excitation of the Chandler Wobble

      • L. Mansinha, D. E. Smylie

      Pages 122-135

   4. Core-Mantle Interactions: Geophysical and Astronomical Consequences

      • M. G. Rochester

      Pages 136-148

   5. An Examination of the Data Relating Pole Motion to Earthquakes

      • Richard A. Haubrich

      Pages 149-158

   6. Evidence for Association of Earthquakes with the Chandler Wobble, Using Long Term Polar Data of the ILS-IPMS

      • Robert J. Myerson

      Pages 159-168

The seeds of this conference were sown with the publication by Press, in 1965, of a paper in which he suggested that the displacement field due to a major earthquake may extend over much greater distances than had been thought possible before. Later on, Mansinha and Smylie pointed out that if Press was correct then, since the redistri­ bution of significant quantities of mass was involved, the inertia tensor of the earth would be altered and thus cause the earth to wobble; this revived the idea that earth­ quakes might be the long sought source for maintaining the Chandler Wobble. They argued that since earthquakes are sudden events it should be worthwhile trying to determine if there was any correlation between sudden changes in the Chandler term of the pole path and major earthquakes. Furthermore, since displacements occur both before and after an earthquake it might be possible to obtain a few days warning of a major earthquake by making instantaneous observations of the pole path. Analysis of the data indicated some correlation but, as often happens in science in general and in geophysics in particular, the results were not conclusive because of imperfect theory and the need for more accurate determinations of the pole position. It soon became clear that a meeting between geophysicists and astronomers involved in this type of work would be of mutual benefit.

• Libration
• interferometry
• solar
• solar activity

• University of Western Ontario, London, Canada

  L. Mansinha, A. E. Beck

• University of British Columbia, Vancouver, Canada

  D. E. Smylie

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