91.00.00 Solid Earth physics
- 91.10.-v Geodesy and gravity (see also 91.50.Kx Gravity and isostasy-in Marine geology and geophysics; 91.45.gh-in Geophysics Appendix)
- 91.25.-r Geomagnetism and paleomagnetism; geoelectricity (see also 91.50.Iv Marine magnetics and electromagnetics)
-
91.30.-f Seismology
(1)
- 91.32.-m Rheology of the Earth
- 91.35.-x Earth`s interior structure and properties
-
91.40.-k Volcanology (see also 91.30.Tb Volcano seismology)
(1)
- 91.45.-c Tectonophysics
- 91.50.-r Marine geology and geophysics
- 91.55.-y Structural geology
- 91.60.-x Physical properties of rocks and minerals (for rheological properties of geological materials, see 83.80.Nb)
- 91.62.+g Biogeosciences (see also 91.67.Uv Organic and biogenic geochemistry; 92.20.Jt Biology of the ocean; 91.80.Kc-in Geophysics Appendix)
- 91.65.-n Mineralogy and petrology
- 91.67.-y Geochemistry (see also 92.20.Cm Chemistry of the ocean; 92.40.Bc Chemistry of fresh water; 92.60.Ls Ion chemistry of the atmosphere; 91.62.Kt, 91.80.Kc, and 92.20.C- in Geophysics Appendix)
- 91.70.-c Information related to geologic time
- 91.80.+d Geochronology (see also 92.30.Hj-in Geophysics Appendix)
- 91.90.+p Other topics in solid Earth physics (restricted to new topics in section 91)