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From: aboulang@bbn.com (Albert Boulanger)
Newsgroups: sci.physics,sci.electronics,rec.radio.shortwave
Subject: Listening to earthquakes.
Message-ID: <50496@bbn.COM>
Date: 6 Jan 90 19:43:48 GMT
Sender: news@bbn.COM
Reply-To: aboulanger@bbn.com
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I found an interesting note in a recent Science blurb that you
LOW-low-low lowfers (<100HZ!) might delight in :-). On page 1562 of
the Dec 22nd Science there is a discussion of the Loma Prieta Quake.
The discussion mentions an interesting correlation made by Antony
Fraser-Smith and colleagues from Stanford: radio background noise
activity in the 0.01 to 10HZ range was up 12 days before the quake. 3
hours before the quake it was up 30x from the previous level. (There
was a drop 1 day before the quake.) There was nothing like this during
the 2 years of operating this low-frequency broad-band receiver. (They
were studying sun-related radio noise that interferes with submarine
communications.) There is a picture of either the receiver or the
antenna on page 1563. Does anybody know the principles of reception for
this ultra-low frequency range? What kind of antenna would be used?

Also, I have been interested in DXing of the ET kind. There has been
a lot of good engineering put into wide-band-multichannel SETI
(looking for signals from outer space) receivers. Anybody know more
of the details on this?



Yours in the miles and smiles of a wavelength :-),
Albert Boulanger
BBN Systems & Technologies Corp.
aboulanger@bbn.com