PSN-L Email List Message

Subject: Re: something else about microseisms
From: Robert McClure bobmcclure90@.........
Date: Sun, 20 Dec 2009 20:53:15 -0500

  The Rayleigh wave is a surface wave mode having retrograde
elliptical particle motion. When you push up and down on a particular
spot on the elastic earth, there must be a resulting longitudinal
motion away from the depressed area. Vertical force is enough to drive
the wave. You do not need to supply any transverse force.


Dr. Peters said "This is in fact the reason we know (from seismic
studies) that the earth's core includes a liquified one that surrounds
the innermost solid one.  I am surprised by the fact that this
property of liquids is apparently thus well known to seismologists,
while at the same time they believe that water (pressure) waves
working on the floor of the ocean could generate horizontal motions of
that floor as well as vertical ones."

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