旁观者
发表于 2025-3-25 03:53:49
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SPASM
发表于 2025-3-25 07:41:21
Results of Magnetic Measures at Sea. Transverse Fractures,ng 3000 γ (1γ= 10. Oe) on the ridges, while values one-tenth as large are rare on the continents. First results came from the East Pacific where Mason in 1958, then Mason and Raff in 1961 revealed curious parallel anomalies (Figure 13), and concluded .from the sharpness of their edges that they orig
interpose
发表于 2025-3-25 14:37:15
,Reversals of the Earth’s Magnetic Field. Vine and Matthews’ Hypothesis,valent to the field of a small magnet or ‘dipole’ placed at the centre. Actually the field varies continually; if its annual mean is taken and if it is developed in spherical harmonics as was done by Gauss, it is found to be almost exclusively of internal origin, and it is found that the leading ter
友好
发表于 2025-3-25 18:05:50
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Harpoon
发表于 2025-3-25 22:23:15
Study of the Oceanic Crust by Seismic Refraction and Gravimetry,er of seismic profiles carried out in the last few years has considerably changed the picture gained from the study of near earthquakes more than 20 y. ago. At that time the continental crust was imagined as a series of geological layers defined by the average velocities of seismic waves in them. Be
Exterior
发表于 2025-3-26 02:28:10
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平息
发表于 2025-3-26 07:28:35
Nature of the Upper Mantle and Theories of Convection,uch currents, each time endowing them with the peculiar properties required for the problem at hand, without stating explicitly their general characteristics or their deeper causes. The aim of the present chapter is to show that provisionally acceptable theories may now be drawn from the very great
培养
发表于 2025-3-26 09:25:42
Oceans and Continents. Conclusion,hemistry; or again the mantle temperature depends on the way heat escapes from the core, and the theory of the terrestrial dynamo might be able to furnish information in this regard. But the benefits are lost in the growth of the margin of uncertainty. It is time to conclude by returning gradually t
先锋派
发表于 2025-3-26 13:32:40
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舔食
发表于 2025-3-26 17:24:52
Book 1972s important question, my colleague Thellier and I decided in the early summer of 1967 to make it the subject of the annual seminar on Earth physics for the school year 1967-68. Although research was still developing rapidly, the General Assembly of the International Union of Geodesy and Geophysics h