Story today describes how gravity waves from an earthquake can lead to
earlier warning; of a few seconds before the seismic wave front
arrives.

http://www.abc.net.au/news/2016-11-23/earthquake-detection-discovery-'could=
-save-lives'/8049000

My opinion; not every earthquake would involve a significant gravity
wave, and widely distributed seismic sensors combined with a radio
network would be as effective and possibly much cheaper.  ;-)

Looks like the topical news selection bias effect.

--=20
James Cameron
http://quozl.netrek.org/
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