What question did this study set out to answer?

To evaluate Earth's internal density variation and quantify potential errors in mantle and core density estimates.

July 1, 1940Bulletin of the Seismological Society of America

The problem of the earth's density variation*

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Authors

KBK. È. BullenGoogle (United States)

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Implication

Geophysical modeling reveals precise density distributions across Earth's mantle and core, indicating lower mantle rigidity increases more slowly with depth than predicted by finite strain theory.

Key Points

To evaluate Earth's internal density variation and quantify potential errors in mantle and core density estimates.
Applied equations derived by Birch from Murnaghan's finite strain theory to model internal density, pressure, and gravitational attraction.
Performed quantitative error estimation on density distributions throughout the outer mantle and central core.
Mantle density ranges from 3.32 gm/cm³ at the base of the crust to 5.68 gm/cm³ at the base of the mantle (accuracy within ~0.05 gm/cm³).
The mean density of the central core is determined to be 10.7 gm/cm³ within an estimated error margin of 0.1 gm/cm³.
Lower mantle rigidity increases more slowly with depth than predicted by Birch's finite strain equations, despite overall agreement in density figures.

Cite This Study

K. È. Bullen (1940) studied this question.

synapsesocial.com/papers/6a035d5a59ea043e4c9e50cb https://doi.org/10.1785/bssa0300030235

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Implication

Geophysical modeling reveals precise density distributions across Earth's mantle and core, indicating lower mantle rigidity increases more slowly with depth than predicted by finite strain theory.

The problem of the earth's density variation*

Discussion

Member takes

Implication

Key Points

Cite This Study

The problem of the earth's density variation*

Discussion

Member takes

Implication

Key Points

Cite This Study

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