Frequency.

Frequency or pitch can be derived from, or related to, the square root
of the tension, the square of its diameter and the inverse of the
length of the vibrating material.

There is no reason to believe the same cannot be applied to the
physics of seismology. (If such in fact is not already the case.)

Bernard Chouet did some work on the frequencies of seismic waves,
bringing to the attention of his peers that there is a relationship in
the change of frequencies prior to disturbances. And that such pitches
could be used to identify what seismic reactions were most likely.

Marin Mersenne, an early advocate of Open Source, proposed that as
many as five different notes could be plucked at the same time on an
open string of a musical instrument.

Obviously he was not referring to a carillon as such bells use ropes,
not strings.

Haw, haw!

*******

Tension.

It is difficult to imagine that plates of a soft material such as
earth -especially such materials as earth near the point of
liquefaction, can produce any (never mind much) tension.

So what might be the material that is in tension? Solid rock strata
perhaps? Pressurised vessels such as caverns filled with superheated
water, steam or magma?

Thus giving us a likely subject whose diameter might be measured. And
so too, its length.

I believe the equation for pitch is:
The square root of the tension divided by the product of the square of
its diameter and the inverse of the length.

And which if applied to the vibrating material, will give us a
mechanism for measuring the earth. Or a substantial portion of it,
perhaps.

If only we had a little more than the frequency to go on.

Such is the dark art though, that after all these billions of dollars
spent on it, all we have is an inkling of the frequencies.















Except that, thanks to Mersenne, we can guess the length of the string
by the number of the the frequencies involved, provided only that we
can locate all the right frequencies.

.

Relevant Pages

  • Re: Frequency.
    ... Bernard Chouet did some work on the frequencies of seismic waves, ... earth -especially such materials as earth near the point of ... can produce any tension. ... In the presence of a blocking high, things take off in the South Seas. ...
    (sci.geo.earthquakes)
  • Re: Frequency.
    ... of the tension, the square of its diameter and the inverse of the ... If you're talking about a string ...and you left out the mass. ... the change of frequencies prior to disturbances. ... The resonant frequency of any vibrating body is related to the stress it ...
    (sci.geo.earthquakes)
  • Re: Frequency.
    ... of the tension, the square of its diameter and the inverse of the ... the change of frequencies prior to disturbances. ... its diameter and the inverse of the length. ...
    (sci.geo.earthquakes)
  • Re: Finding the phase of unknown signals in data
    ... result of the FFT in a given bin (you took the square root of the sum ... phase of signals at different frequencies can't be compared. ... compare phaserelative to some predetermined point in the ... repeating pattern set. ...
    (comp.dsp)
  • Re: Buliding the ultimate Faraday Cage
    ... Certain materials can block out certain frequencies, ... can combine wavelengths to produce the frequency within the faraday cage. ... Is conductivity all that matters when creating such barriers? ...
    (sci.physics.electromag)
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