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Super-sensitive microphone to record splitting rock?

Discussion in 'Microphones' started by cannon, May 27, 2010.

  1. cannon

    cannon Guest

    Hi,

    I'm working on a piece for which I need to record the sounds of a rock splitting and cracking. I'm going to be using a quarrying composite which is filled into pre-drilled holes and which, when mixed with water, expands with huge amounts of pressure, breaking the rock open from the inside. This process takes around an hour. Cracks start to open up and the rock will eventually fall apart.

    However, I also want to capture any minute movements/noises that may prefigure the more dramatic/obvious splits. Any thoughts on how I could do this? I would suppose contact microphones, but must admit I don't know much about sound recording. I know geologists record extremely subtle earth movements and tectonic shifts but couldn't find much technical information on how this is done.

    Any help would be very much appreciated,

    Thanks in advance,

    Phil
     
  2. Boswell

    Boswell Moderator Distinguished Member

    The standard device for this is the geophone. This behaves like a moving-coil dynamic mic, but has a response down to near d.c. (no built-in transformer).

    You may additionally want to set up some acoustic microphones around the rock to record the final split and the sound of it then rolling down the hill. Any standard mic used for rock'n'roll will do.
     

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