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The Constitution of the Interior of the Earth, as Revealed by Earthquakes

Richard Dixon Oldham
Quarterly Journal of the Geological Society, 62, 456-475, 1 February 1906, https://doi.org/10.1144/GSL.JGS.1906.062.01-04.21
Richard Dixon Oldham
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Abstract

I. Introductory.

Of all regions of the earth none invites speculation more than that which lies beneath our feet, and in none is speculation more dangerous; yet, apart from speculation, it is little that we can say regarding the constitution of the interior of the earth. We know, with sufficient accuracy for most purposes, its size and shape: we know that its mean density is about 5 1/2 times that of water, that the density must increase towards the centre, and that the temperature must be high, but beyond these facts little can be said to be known. Many theories of the earth have been propounded at different times: the central substance of the earth has been supposed to be fiery, fluid, solid, and gaseous in turn, till geologists have turned in despair from the subject, and become inclined to confine their attention to the outermost crust of the earth, leaving its centre as a playground for mathematicians.

The object of this paper is not to introduce another speculation, but to point out that the subject is, at least partly, removed from the realm of speculation into that of knowledge by the instrument of research which the modern seismograph has placed in our hands. Just as the spectroscope opened up a new astronomy by enabling the astronomer to determine some of the constituents of which distant stars are composed, so the seismograph, recording the unfelt motion of distant earthquakes, enables us to see into the earth and

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Quarterly Journal of the Geological Society: 62 (1-4)
Quarterly Journal of the Geological Society
Volume 62, Issue 1-4
February 1906
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The Constitution of the Interior of the Earth, as Revealed by Earthquakes

Richard Dixon Oldham
Quarterly Journal of the Geological Society, 62, 456-475, 1 February 1906, https://doi.org/10.1144/GSL.JGS.1906.062.01-04.21
Richard Dixon Oldham
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The Constitution of the Interior of the Earth, as Revealed by Earthquakes

Richard Dixon Oldham
Quarterly Journal of the Geological Society, 62, 456-475, 1 February 1906, https://doi.org/10.1144/GSL.JGS.1906.062.01-04.21
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