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Seismic Wave Velocities in Earth's Mantle from Mineral Elasticity

Buchen, Johannes (2021) Seismic Wave Velocities in Earth's Mantle from Mineral Elasticity. In: Mantle Convection and Surface Expressions. American Geophysical Union , Hoboken, NJ, pp. 51-96. ISBN 9781119528616.

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The propagation of seismic waves through Earth's mantle is controlled by the elastic properties of the minerals that form mantle rocks. Changes in pressure, temperature, and chemical composition of the mantle as well as phase transitions affect seismic wave speeds through their impact on mineral elasticity. The elastic properties of minerals can be determined in experiments and by first-principle computations and be combined to model the elastic wave speeds of mantle rocks. Based on recent advances, I evaluate the uncertainties on modeled elastic wave speeds and explore their sensitivity to physical and chemical key parameters. I discuss the elastic properties of solid solutions and elastic anomalies that arise from continuous phase transitions, such as spin transitions and ferroelastic phase transitions. Models for rocks of Earth's lower mantle indicate that continuous phase transitions and Fe-Mg exchange between major mantle minerals can have significant impacts on elastic wave speeds. When viewed in context with other constraints on the structure and dynamics of the lower mantle, mineral-physical models for the elastic wave speeds of mantle rocks can help to separate thermal from compositional signals in the seismic record and to identify patterns of material transport through Earth's deep interior.

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Buchen, Johannes0000-0001-5671-5214
Additional Information:© 2021 American Geophysical Union. Published Online: 11 June 2021. The author would like to thank J. M. Jackson and W. Sturhahn for discussions about spin transitions and G. Steinle-Neumann for providing valuable feedback on parts of the manuscript. The constructive feedback of three anonymous reviewers is highly appreciated and helped to improve the manuscript. National Science Foundation’s Collaborative Study of Earth’s Deep Interior (EAR-1161046, awarded to J. M. Jackson) supported a portion of this work.
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Subject Keywords:Earth's mantle; elastic properties; finite-strain theory; mineral elasticity; parameter uncertainties; phase transitions; quantum-mechanical computations; seismic wave velocities; solid solutions
Record Number:CaltechAUTHORS:20210622-163226871
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Official Citation:Buchen, J. (2021). Seismic Wave Velocities in Earth's Mantle from Mineral Elasticity. In Mantle Convection and Surface Expressions (eds H. Marquardt, M. Ballmer, S. Cottaar and J. Konter).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109526
Deposited By: Tony Diaz
Deposited On:23 Jun 2021 19:28
Last Modified:24 Jun 2021 20:45

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