ABEM Terrameter SAS 1000 / SAS 4000
- 100 -
14.8
GRAD3L6 + GRAD3S6: 3-CHANNEL MULTIPLE GRADIENT
ARRAY CVES WITH 4 ELECTRODE CABLES
This combination of protocol files is intended for multiple gradient array CVES roll-along
measurements, and has been found very useful for a variety of applications. It offers a
resolution superior to the commonly used Wenner array, and thanks to 3-channel measuring
the increased data density does not become costly in terms of increased time required in the
field. Note that it is important to select the protocol files in the correct order, starting with the
long layout (GRAD3L6) before selecting the protocol for short layout (GRAD3S6). It gives a
dense near-surface cover, and a slightly sparser measurement pattern at long electrode
spacings. GRAD3S6 is designed to supplement GRAD3L6for the shortest electrode spacings
only.
Array
type
Protocol
name
Address
file
No of
data
ORG
No of
data
UP
No of
data
DWN
Total data
for
one
layout
17
Gradient
GRAD3L6 LONG
504
234
234
942
GRAD3S6 SHORT
198
120
120
17
Total number of data points for a four-cable layout using the procedure described in this manual.
Figure 32. Data cover of GRAD3L6 and GRAD3S6 for roll-along with three full stations
(minimum electrode spacing 5 metres). Note that many data points fall on top
of each other in multiple gradient array pseudosection plots.
