PSN-L Email List Message

Subject: Interesting Science Article
From: John Hernlund hernlund@.......
Date: Fri, 24 Mar 2000 14:57:12 -0700 (MST)

Hello All,
   Just ran across an interesting article in today's Science about noise and
how it is coupled to the atmosphere.  The abstract follows:

Resonant Oscillations Between the Solid Earth and the Atmosphere 

Kiwamu Nishida, 1 Naoki Kobayashi, 2 Yoshio Fukao 1 

Continuously excited free oscillations of the whole Earth have been found in
the ground noise in a frequency band of long-period surface waves. Here we
report evidence of an annual variation of this phenomenon, indicating that the
excitation source is not within the solid Earth. There is evidence that these
seismic free oscillations resonate with acoustic free oscillations of the
atmosphere. The observed amplitudes suggest that the excitation source is at
or just above Earth's surface.

John Hernlund
E-mail: hernlund@.......



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