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5.5 Air Waves
Some hyperbolas are caused by air wave reflections from objects above ground, such as posts,
fences, overhead wires, and trees.
The following image displays how air wave reflections affect data:
An important part of understanding the data image is learning to recognize these unwanted "air"
targets and distinguish them from the targets in the ground. Good field notes are indispensable
for helping identify unwanted events on the data.
The best way to identify air reflections is the target hyperbola method. Hyperbolas from above
ground objects are wider than objects in the ground and will have a Soil Cal at, or close to, 300.
To learn more, see Soil Cal
Material
Air
Ice
Dry Soil
Dry Rock
Soil
Wet Rock
Concrete
Pavement
Wet Soil
Water
(Section
6.6.5).
Soil Cal
300
160
140
120
100
100
100
100
65
33
49
GPR Concepts
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