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Signs of impending major earthquake

Anonymous Coward
User ID: 23608681
09/13/2012 05:41 PM
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Signs of impending major earthquake
With all the reports of strange rumbling noises, sulphur smells and animal unrest, there is the distinct likelihood of a major earthquake in the near future.

¨When gas has invaded an area of the crust, it generally shows some emission at the surface that can be observed, and that results in the various effects mentioned. Of course the gases that were in the pore-spaces to start with are pushed up first, before the "new" gas has got to the surface. This brings up smells which cause surprise or consternation among many animals; it brings up more carbon-dioxide and less oxygen than air has normally, and this drives animals out of burrows; it brings up humidity and temperature of the sub-surface and thus frequently makes a fog. This contains more of the heavy CO2 molecule than the average air, and can therefore make a warmer cloud that stays on the ground instead of rising rapidly. Radioactive gases that are normally generated in the ground make a prominent appearance as they are flushed from the ground.

These signs should be taken to mean that the rock underneath has now suddenly lost much of its strength, and even small stresses will allow it to break. There was no particular build-up of stress prior to the quake, and measurements of this are therefore useless as predictors. The sudden event was the gas invasion that weakened the rock, and it is on this that a prediction method has to be based. During earthquakes and after, a lot more gas escape can usually be observed, and by then the deep source gas may have made its way to the surface. This is often combustible, probably mainly methane as this is in most common gas in deep rocks, and it often catches fire. ¨

[link to trilogymedia.com.au]

Some interesting (and unsettling) accounts of pre quake indicators.