Bob,
     Your comment concerning boreholes is interesting for the following rea=
son.  Prof. Dan Russell at Kettering Univ. has one of the best wave simulat=
ion programs I've seen. It is online at
http://paws.kettering.edu/~drussell/Demos/waves/wavemotion.html
   If you look at his Rayleigh simulation, note also his comment that the c=
ounterclockwise circulation goes over into clockwise at a depth of about on=
e-fifth of a wavelength.  For wave speed of 3000 m/s and a period of 3 s, t=
his should happen at a depth of 1500 m.  Since my  cylinder (on which the p=
ier rests) goes down only about 6 m maximum, it should therefore be moving =
almost completely (top to bottom) in accord with the surface clockwise moti=
on.   One would have to use a very deep borehole indeed, for the influence =
of depth to eliminate the microseisms by means of inherent attenuation, ass=
uming that microseisms are pure Rayleigh waves.
   Randall













Bob,

     Your comment concerning boreh=
oles
is interesting for the following reason.  Prof. Dan Russell at Ketteri=
ng
Univ. has one of the best wave simulation programs I’ve seen. It is
online at

ht=
tp://paws.kettering.edu/~drussell/Demos/waves/wavemotion.html

   If you look at his Rayleigh simulation, n=
ote
also his comment that the counterclockwise circulation goes over into clock=
wise
at a depth of about one-fifth of a wavelength.  For wave speed of 3000=
 m/s
and a period of 3 s, this should happen at a depth of 1500 m.  Since m=
y  cylinder
(on which the pier rests) goes down only about 6 m maximum, it should there=
fore
be moving almost completely (top to bottom) in accord with the surface
clockwise motion.   One would have to use a very deep borehole in=
deed,
for the influence of depth to eliminate the microseisms by means of inheren=
t attenuation,
assuming that microseisms are pure Rayleigh waves.  

   Randall