On 15 Apr 2006 06:19:27 -0700, "Weatherlawyer"
wrote:


(snip)

The arrays were able to detect frequencies of -10 to +10 htz IIRC. The
fequency of earthquakes and nuclear explosions on the other side of the
globe. Not so necessary now there is only Iranian hospita XRay machines
and Iraqi portable toilettes to worry about.
(snip)

Is there some meaningful definition for -10 Hz?