3 ms·

There is nothing to insulate against these large, low frequency waves. They penetrate solid rock. Perhaps enough water could absorb the waves and dissipate th

• astrodust 9y ago
  When doing laser holography the standard practice is to build a large, heavy bed, like a sturdy wooden frame filled with dry sand, and lay that on top of something that absorbs vibrations like a series of tires and inner tubes. That usually does a good job of sponging up any low-frequency vibrations so long as you don't have any harmonic issues. If you were battling a persistent hum you'd have to engineer the floors in your house to be floating in this fashion, if not the entire house.
• Johnythree 9y ago
  See my post above on tracking down these sounds, and how a anechoic chamber would actually make it worse. At least in my case.