Re: LF: RE: Re: What has VLF to do with Toads & Earth Quakes ?

[M0FMT <m0fmt@yahoo.co.uk>]

Hi Alan, Hugh, Jean-Louis and LF

　

I am glad you all read this in the spirit in which it was posted.

I found it by accident when searching GBS/Z.

My motives for posting were, humour, relevance, intrigue, and a possible way in which LF/VLF enthusiasts could contribute to the research.

This long standing conundrum, if solved would undoubtedly save literally millions of lives over time as Alan said.

Frogs aside, one thing occurred to me was that in the build up to an EQ the mantles bedrock must be subject to incredible stress over a long period of time before something gives. These are massive rocks and are kms long, through the crust. I know stress in steel and other materials results in a phenomenon called the magnetostrictive effect which is used, I believe, in strain gauging, ultrasound transducers and the like. So how much is the earth’s magnetic field distorted by this pre EQ stress in the bedrock and how subtle is it and is it detectible with sufficient precision to be useful and would VLF play a part?

The original paper was I think taking a typical OU approach to this science by not accepting boundaries between the branches of science. However for creatures to be considered as an EQ detector like the Canary in a mine is I say; score one for the toads!

Some possible further reading on my take on EQ magnetic effects ;-

http://www.swri.org/3pubs/brochure/d17/magneto/magneto.htm

http://www.geol.umd.edu/~rudnick/Webpage/Rudnick_Gao_Treatise.pdf

http://www.fas.harvard.edu/~planets/louzada/pubs/PhD%20Dissertation%20Louzada%2005-22-09.pdf

But it’s all getting too deep for me.

 

73 es GL petefmt

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From: "Jean-Louis.RAULT@fr.thalesgroup.com" <Jean-Louis.RAULT@fr.thalesgroup.com>
To: rsgb_lf_group@blacksheep.org
Sent: Mon, 17 January, 2011 9:04:40
Subject: LF: RE: Re: What has VLF to do with Toads & Earth Quakes ?

Hugh

 

One of the purposes of the french satellite DEMETER is to study any VLF perturbations potentially linked to earthquakes;

 

See for example http://www.geodin.ro/EMSEV/scientific%20program.html

 

Asking "demeter earthquakes pdf" to Google will bring you many observations and theories on that subject

 

73 de Jean-Louis F6AGR

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From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Hugh M0WYE
Sent: Saturday, January 15, 2011 4:22 PM
To: rsgb_lf_group@blacksheep.org
Subject: LF: Re: What has VLF to do with Toads & Earth Quakes ?

Dear Bufo Bufo and group,

There are indeed some strange scientific papers about.

 

It seems to me that it would be best to study links between VLF propagation and earthquakes, and between VLF propagation and toad breeding patterns seperately. But the author is clearly interested in any ability to predict earthquakes found in animals.

I had not heard of any effect of earthquakes on VLF before, although it is true that there are many factors which affect the ionosphere. 

 

The suggestion is not that the earthquake emits a VLF signal, rather that it disturbs the ionosphere, so that VLF signals are no longer reflected across the "sky". The main things which affect the ionosphere are solar radiation, the solar wind and the earth's magnetic field.

Of these, the magnetic field seems the strongest contender, I wonder if there are any magnetometer records for the area being studied at the time of the quake?

73

Hugh M0WYE