91.25.-r Geomagnetism and paleomagnetism; geoelectricity (see also 91.50.Iv Marine magnetics and electromagnetics)
- 91.25.Cw Origins and models of the magnetic field; dynamo theories
- 91.25.Dx Archeomagnetism
- 91.25.Ey Interactions between exterior sources and interior properties
- 91.25.F- Rock and mineral magnetism (see also 91.60.Pn Magnetic and electrical properties-in Physical properties of rocks and minerals)
- 91.25.G- Spatial variations in geomagnetism
- 91.25.Le Time variations in geomagnetism
- 91.25.Mf Magnetic field reversals: process and timescale
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91.25.Ng Paleomagnetism
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- 91.25.Ph Magnetostratigraphy
- 91.25.Qi Geoelectricity, electromagnetic induction, and telluric currents
- 91.25.Rt Magnetic anomalies; modeling and interpretations
- 91.25.St Magnetic fabrics and anisotropy
- 91.25.Th Reference fields: regional; global
- 91.25.Ux Remagnetization
- 91.25.Wb Geomagnetic induction
- 91.25.Xg Geomagnetic excursion
- 91.25.Za Core processes