Jack Uretsky said... "Sorry. I don't see how the bore-hole data are
related to the question."
Did you read the whole link that Brian provided? Toward the end it
explains exactly what is measured, how it is interpreted, and why it is
done in a bore hole.
If the question is whether or not the earth has a tidal bulge (i.e.
tides in the lithosphere), the answer is most definitely yes. It
amounts to approximately one foot. The site Brian referenced is one of
several that describe how it is measured.
Michael D. Edmiston, Ph.D.
Professor of Physics and Chemistry
Bluffton University
Bluffton, OH 45817
(419)-358-3270
edmiston@bluffton.edu