Mean latitude variations computed by Orlovs or other filters have some irregular variations in addition to secular ones. These are of the order of ±0.05 to ±0.1, they can last several years and sometimes show regional similarities. In looking for an explanation of such latitude variations several physical mechanisms have been investigated. The most probable one is the mechanism of stress propagation in the lithosphere and asthenosphere. The consequent gravitational and deformational effects could explain both the magnitude and the time dependance of the irregular latitude variations.
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Czechowski, L., Kolaczek, B. On geophysical explanation of some irregular variations of the mean latitudes of latitude stations. PAGEOPH 123, 398–406 (1985). https://doi.org/10.1007/BF00880739
- Geophysical explanation
- Ireegular variations
- Mean latitudes
- Stress propagation