Geology Reference
In-Depth Information
Line 1: V Model
s
0
a)
5
10
15
20
0
1000
2000
3000
Shear-wave velocity (m/s)
b)
+2
-20
Horizontal distance (m)
11
35
100
Shear velocity (m/s)
2500
Figure 14.6 Examples of ReMi V s 1D model (a) and 2D model (b) based
on the data in Figure 14.5.
14.3.1 Depth of penetration and resolution
The depth of penetration in a surface-wave survey is determined by the
longest wavelength that can be generated by the source, measured accu-
rately in the field and resolved in modelling. Generally speaking, heavier
sources generate longer wavelengths, but unfavourable site conditions, such
as unconsolidated made ground and materials such as peat, may drastically
attenuate the signals. Cultural noise, whilst necessary for passive methods,
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