Wobble II
"Wobble II", written between 1969-1970, contains handwritten notes and calculations, which are contained within a red hard-cover notebook. In addition to this work, there is also a "Wobble I" which is likewise contained in this digital archive. Note: The notebook is not page numbered so the numbers here are counted from the start. This notebook is a continuation on the last one, which explored earthquakes' effects on the Earth's precession, and which axis it precessed from. At the end of the previous notebook, Dahlen encountered a problem with his argument if the liquid outer core was to be taken into account. In this notebook, to solve for this, he made an assumption that by using the static elastic equations, the dynamic effect of the fluid core can be neglected. He then continues into the exploration of how earthquakes excite this wobble, using an argument of conservation of angular momentum. Finally, Dahlen investigates the effect that earthquakes have on the position of Earth's pole of precession. This collection can be found at: Guyot Hall, Princeton, NJ, 08544. Back to Main Page
	Pages	Sheet Numbers
The Chandler Wobble	3–8	N/A
Consider now the free wobble	9–11	N/A
Now consider the excitation of the wobble by Earthquakes	12-15	N/A
For the purpose of computing	17-25	N/A
A few thoughts and questions	27–28	N/A
Consider a hydrostatic, possibly rotating, possibly anisotropic Earth model	30–33	N/A
Net motion due to a whole series of Earthquakes	34–38	N/A
A spectral approach	39	N/A
On a question raised by Dan P. McKenzie	40–58	N/A
To compute [avg angle] for strike-slip and 45 [deg] dip slip faults	59–61	N/A
A shallow angle overthrust [delta=delta, lambda=90 deg]	62–65	N/A
For an arbitrary fault	66–69	N/A
Alaska and Chile	70–74	N/A
Result of random walk on computer	75	N/A
Evaluation of ΔC in Lagrangian coordinates	76	N/A
Toroidal equations	77	N/A
Lagrangian form for the inertia integral	78	N/A
now from Wobble I	79-85	N/A