Fenceposts and wires resonating, Port Noarlunga – Oct 2018

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Here’s excerpts of some unique recordings I made with a pair of Aquarian hydrophones. I was walking along the Onkaparinga River close to a fence line boundary when I passed what sounded like a pure wave. I realised this was coming from a fence post resonating from the vibration of fixed wires. I pressed my ear to listen closer. It sounded amazing!

I didn’t have any clamps to fix contact mics to the wire, so I decided to bury a pair of hydrophones at the base of two fenceposts. I positioned them so that they were flush and lightly making contact with the base of the post. Both resonances had fundamental frequencies of approx. 360 Hz, with a partial occuring at approx. 420 Hz when the wind picked up and articulated the wires.
I then decided to explore this further by examining the surrounding fenceposts.

Excerpt 2 is one of the initial fenceposts with another fencepost that presented a more complex resonance (423 Hz, 637 Hz, 720 Hz).

Excerpt 3 is another set of fenceposts which were far more subtle in resonance, but prone to perculiar artefacts, which (at this stage) I’m attributing to the wind and movement of sand around the base of the posts.

Excerpt 4 was at a point where the posts produced very complex resonances, and it became apparent that these were not so immediate, but rather, derived from activity occuring 50-100 metres along the wires. (the soft tapping you can hear is raindrops hitting the post, wires and sand.)

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