Marty!
Some 30 years ago they measured infra sound in the ground from a water-powe=
r
plant north-west of Ume=E5, (Sweden) all the way down to south of Sundsvall=
-
over 400!! km away.
Klas.
At 14:55 2001-12-04 -0500, you wrote:
>Dear Brian:
>
>I know I do have the reputation on this list for making wildly immodest
>claims, so perhaps it is the time for me to make the MOST immodest
>claim of my life:
>
>Around 1968-70, while working with Roger S. Payne in Lincoln, MA, helping
>him getting 70 sonabouys ready for his trip to Argentina to study Southern=
>Right
>Whales, I seem to have invented on my own an entirely new field of sound s=
tudy,
>which, to my knowledge still remains largely un-investigated to this day:=
>xylophonics
>- the study of sounds in wood - in live trees - - lots found out, nothing=
>published.
>I WAS interested in getting a handle on insect noises which might be usefu=
ll
>for woodpeckers to locate their food.
>
>I locally placed crystal phono cartridges inside of heavy metal waterproof
>cans on trees. Each cartridge was mounted on foam, and attached directly
>to a lead sinker. The needle-holder was placed on top of a brass screw,
>screwed about 2 cm into the tree. This was run (high impedance output)
>into a FET two stage gain of 1 amp to an very low output impedance,
>over unbalanced mic line into my home into a regular stereo amp.
>Actually one tree fed left, another fed right. The results were not
>at all what I expected, and I will detail them later, when I have more tim=
e,
>but I did find out that ordinary soil, bedrock, and especially tree roots
>feed low vibrations long distances. You could easily hear someone on foot
>at a normal stride approaching the house - or the trees - in this case Red=
Oak,
>from more than 30 feet. And a lone chickadee landing on the 50 foot tree-=
top.
>
>So, to get to an answer - Land is correct about always thinking about shoc=
k
>mounting mics on tripods. The roots and ground can carry rumbles and crun=
ches
>a long way into your nature sound recordings.
>
>
>my very best,
>
>Marty Michener
>MIST Software Associates
>75 Hannah Drive, Hollis, NH 03049
>
>coming soon : EnjoyBirds bird identification software.
>
>
>
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>
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