Koenigsberger ratio

The Koenigsberger ratio is the proportion of remanent magnetization relative to induced magnetization in natural rocks. ^[1] It was first described by J.G. Koenigsberger. ^[2] It is a dimensionless parameter often used in geophysical exploration to describe the magnetic characteristics of a geological body for help in interpreting magnetic anomaly patterns.

${\displaystyle Q={\frac {M_{rem}}{M_{ind}}}={\frac {M_{rem}}{\chi H}}}$ ^[1]

Definition
Q	Koenigsberger ratio
${\displaystyle M_{rem}}$	remanent magnetization
${\displaystyle M_{ind}}$	induced magnetization
χ	the magnetic susceptibility; the influence of an applied magnetic field on a material
H	the macroscopic magnetic field

The total magnetization of a rock is the sum of its natural remanent magnetization and the magnetization induced by the ambient geomagnetic field. Thus, a Koenigsberger ratio, Q, greater than 1 indicates that the remanence properties contribute the majority of the total magnetization of the rock. ^[3]

References

1. "Königsberger Faktor". Spektrum (in German). Retrieved 2023-03-10.
2. Koenigsberger, J. G. (1938). Natural residual magnetism of eruptive rocks. Terrestrial Magnetism and Atmospheric Electricity, 43(3), 299-320.
3. Gubbins, D., & Herrero-Bervera, E. (Eds.). (2007). Encyclopedia of geomagnetism and paleomagnetism. Springer Science & Business Media.