Journal
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
Volume 17, Issue 2, Pages 616-624Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GC006171
Keywords
seismic velocity; density; elastic moduli; minerals; composition; quartz
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Funding
- NSF [OCE-1446970, EAR-1249703]
- Directorate For Geosciences [1249486] Funding Source: National Science Foundation
- Division Of Ocean Sciences [1249486] Funding Source: National Science Foundation
- Division Of Ocean Sciences
- Directorate For Geosciences [1446970] Funding Source: National Science Foundation
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To interpret seismic images, rock seismic velocities need to be calculated at elevated pressure and temperature for arbitrary compositions. This technical report describes an algorithm, software, and data to make such calculations from the physical properties of minerals. It updates a previous compilation and Excel((R)) spreadsheet and includes new MATLAB((R)) tools for the calculations. The database of 60 mineral end-members includes all parameters needed to estimate density and elastic moduli for many crustal and mantle rocks at conditions relevant to the upper few hundreds of kilometers of Earth. The behavior of and quartz is treated as a special case, owing to its unusual Poisson's ratio and thermal expansion that vary rapidly near the - transition. The MATLAB tools allow integration of these calculations into a variety of modeling and data analysis projects.
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