About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A154 (1974)

First Page: 395

Last Page: 405

Book Title: M 23: Plate Tectonics--Assessments and Reassessments

Article/Chapter: Theoretical Aspects of Continental Drift

Subject Group: Structure, Tectonics, Paleostructure

Spec. Pub. Type: Memoir

Pub. Year: 1974

Author(s): Harold Jeffreys (2)

Abstract:

According to a Previous HitlawNext Hit of imperfection of elasticity (the modified Lomnitz Previous HitlawNext Hit), creep at small stresses, under a constant applied stress, increases with time as t^agr (^agr = about 0.2). Use of this Previous HitlawNext Hit makes it possible to avoid contradictions with actual observations as given by increases like log t or t. Moreover, the modified Previous HitlawNext Hit also explains the damping of the 14-monthly nutation (Chandler wobble), the sharpness of transverse seismic waves at great distances, the moon's rotation, and the persistence of the moon's dynamic ellipiticities. However, the damping action of the modified Lomnitz Previous HitlawNext Hit makes it impossible for convection to tak place. Thus, continental drift--by convection, seafloor spreading, and/or plate tectonics--cannot occur. Appreciation by geologists of the significance of the modified Lomnitz Previous HitlawNext Hit is essential if progress in geology and geophysics is to continue.

Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Watermarked PDF Document: $14
Open PDF Document: $24