weathered layer

weathered layer

[′weth·ərd ′lā·ər]
(geophysics)
The zone of the earth which lies immediately below the surface and is characterized by low wave velocities.
References in periodicals archive ?
6) The silver-grey weathered layer which forms eventually protects the oak board from the loss of its natural tannin protection.
When we look at the seismic velocity section at a distance of 150 m, it is possible to find two seismic boundaries of Vp velocities at depths comparable to a location of weathered layers of phyllite and almost constant velocity in the layer of phyllite between these two boundaries (a depth from 11 m to 19 m).