Dynamics of the inner core

Xu, S., D. J. Crossley and A.M.K. Szeto, 1999, Variations in length of day and inner core differential rotation from gravitational coupling, Phys. Earth and Planet. Int.,117, 95-110.

Slichter triplet
One of the most famous and difficult-to-detect modes of the Earth is the elusive Slichter triplet, which I do not believe has yet been seen in any data set at the Earth's surface. There are two schools of thought concerning its existence. The first  believes that it is both theoretically excited and potentially visible in SG data and data from the world wide seismic networks. The other believes either that there are as yet unexplained reasons why it cannot be excited to its theoretical level (such as loss of energy at the ICB), or that its excitation is below the threshold of detectability.

Hinderer, J., Crossley, D. and Jensen, O., 1995. A search for the Slichter triplet in superconducting gravimeter data, Phys. Earth Planet. Int., 90, 183-195.

Crossley, D., 0. Jensen, M. C. Rochester & W.-J. Wu, 1994. The Slichter Triplet - Why Have We Not Seen It?, paper presented at SEDI 94, Whistler mountain, Canada, August 1994.

Crossley, D. J., Hinderer, J., & Jensen, O. 1993. Stacking superconducting gravimeter records for 1S1, Seventh meeting of the EUG, Strasbourg, Terra Abstracts, 5, Suppl. 1, 24.

Crossley, D. J., Rochester, M.G. and Peng, Z.R. 1993. Correction to: Slichter modes and Love numbers, GRL,  20, 333

Crossley, D. J. Rochester, M.G. & Z.R. Peng, 1992. Slichter modes and Love numbers, Geophys Res. Lett. 19, 1679-1682.