https://www.usgs.gov/publications/rayleigh-wave-diffractions-due-a-void-layered-half-space
Rayleigh-wave diffractions due to a void in the layered half space | U.S. Geological Survey
Void detection is challenging due to the complexity of near-surface materials and the limited resolution of geophysical methods. Although multichannel,...
https://www.fz-juelich.de/en/jcns/expertise/conferences-and-workshops/hbs-workshops/hbs-instrumentation-workshop/kohlmann_impulsepresentation_diffractometry.pdf
Diffractions-Kohlmann.pdf
diffractionskohlmannpdf