Hey Guys, [possibly gals] ,

The following below is one of the most perfect classical images
of a regional EQ waveform which I have ever seen,

http://www.1goss.com/Arkansas42.jpg

Can anyone please tell me more
about the system which recorded this signal ?

Possibly the station itself ?

Is that station suitable for teleseismic events ?

I often wondered if it may be best to use two different
channels with two different circuits each adjusted
only for regionals (0.25 to 5Hz) and the other only for
teleseismic (0.03 to 1Hz)?
However, both channels will rely upon the very same sensor
or sensor array.

I have been looking at gravity normalized to 1G
for various periods of a pendulum and come up with
the following Idea.

Given: 1g and 1sec period (P)
Find: new values of g for any given period.

g = 1 / P^2

This means if you could float lead in some kind of
dense fluid which through buoyancy removes
94% of its weight you might get a 5 second period
by then suspending the submerged piece of lead
by a spring extended by what might be
10 inches or so of extension from zero.
I have not tried this, possibly one of you know more ?
What fluid is dense enough to take up the weight
of lead which is like 11.4 grams/ml
you need a fluid with a density of like
11.4 * .94 or 10.72 grams / ml.
I can find no such fluid, but is there a way
to create such a fluid of practically any
density you might need ?

I figure anything which can counter 94% the mass weight
will give the same result. Not just fluids.

Am I wrong here ?

http://www.1goss.com/Arkansas42.jpg

Comments Please, private or public welcomed.

geoff

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