This study correlates the 6.4 year envelope of Chandler Wobble with magma eruptions on Mt. Etna

https://phys.org/news/2019-12-earth-earthquakes-volcanic-eruptions-mount.html

Lambert, S. & Sottili, G. Is there an influence of the pole tide on volcanism? Insights from Mount Etna recent activity. Geophysical Research Letters (2019) doi:10.1029/2019GL085525.

> “The tide from polar motion causes the crust to deform over the span of seasons or years. This distortion is strongest at 45 degrees latitude, where the crust moves by about 1 centimeter (0.4 inches) per year.”

And from earlier in the year, Tamino found this correlation of Chandler Wobble with sea-level rise oscillations at mid-latitudes along the USA east cost:

https://tamino.wordpress.com/2019/01/12/wobbly-sea-level-rise-u-s-east-coast-vi/