ABEM Terrameter SAS 1000 / SAS 4000
- 105 -
14.13
SQUARE2A, SQUARE2B AND SQUARE2C: SQUARE ARRAY
AREA COVER WITH TWO ELECTRODE SPACINGS
These protocol files are intended for area cover with roll-along perpendicular to the layout
direction of the cables. The roll-along direction can be in either direction depending on if a
right handed or left handed coordinate system is preferred (often the opposite direction to as
what is illustrated above is preferable). Two electrode spacings are measured: 1x and 2x the
take-out spacing. Observe that there is no support in RES3DINV for this electrode
configuration, and that it is not suitable for 3D inversion due to limited depth cover!
Note that it is not possible to calculate an apparent resistivity for the square-
array: in
homogeneous ground no potential is measured!
Protocol
Array Type Address File
Size .ORG Size .UP/.DWN
SQUARE2A
Square-
SQUARE32
59
39
SQUARE2B
Square-
SQUARE32
59
39
SQUARE2C
Square-
SQUARE32
59
39
Sum
177
117
Figure 37. Data cover for roll-along with three stations of square array area measurements
using SQUARE2A, SQUARE2B or SQUARE2C.
