slowness (was: Re: The Galilean Limit of GR and 2 Forms of ADM)

[Jonathan Thornburg]

From: "Jonathan Thornburg [remove -animal to reply]" <jth...@astro.indiana-zebra.edu>
Subject: slowness (was: Re: The Galilean Limit of GR and 2 Forms of ADM)
Newsgroups: sci.physics.research
References: <2f7d585e-f445-4098...@f20g2000vbl.googlegroups.com>

Rock Brentwood <mark...@yahoo.com> wrote:
> [4] Inertocity suffers the same problem as does the Millennial Decade:
> nobody ever got around to naming it, until I did, just now. While
> physicists measure speed by how far you go in a given time, we in the
> running sports and in track measure inertocity -- which is how long it
> takes you get go a given distance. Inertocity has units, such as miles
> per minute. Nobody ever got around to naming this concept. I just did.

Geophysicists & seismologists have used the concept of inverse-velocity
for a long time; they call it "slowness". It's particularly useful in
studying how seismic waves refract when travelling through an anisotropic
medium (like the Earth). google "seismology slowness" for lots and
lots of example usages & references...

--
-- "Jonathan Thornburg [remove -animal to reply]" <jth...@astro.indiana-zebra.edu>
Dept of Astronomy, Indiana University, Bloomington, Indiana, USA
"Space travel is utter bilge" -- common misquote of UK Astronomer Royal
Richard Woolley's remarks of 1956
"All this writing about space travel is utter bilge. To go to the
moon would cost as much as a major war." -- what he actually said

[Jonathan Thornburg [remove -animal to reply]]

I wrote:
> Geophysicists & seismologists have used the concept of inverse-velocity
> for a long time; they call it "slowness". It's particularly useful in
> studying how seismic waves refract when travelling through an anisotropic

xxxxxxxxxxx

Sorry, that should have been "inhomogeneous", not "anisotropic".

> medium (like the Earth). google "seismology slowness" for lots and
> lots of example usages & references...

--
-- "Jonathan Thornburg [remove -animal to reply]" <jth...@astro.indiana-zebra.edu>
Dept of Astronomy, Indiana University, Bloomington, Indiana, USA

"If the triangles made a god, it would have three sides." -- Voltaire