Water damps the sonic vibrations and spreads its bandwidth such that the quadrature at 524 Hz is in comparable magnitude as the peak signal at 528 Hz. The quadrature signal 524 Hz opens up the rift line in time created by 528 Hz.
If water is not used, then 524 Hz will have to be applied separately after the rift line has appeared.
This suggests that for each of these 'special' frequencies a similar quadrature frequency exists that acts orthogonally to it. For example, 417 Hz and 432 Hz.
Good night.
