This document contains 6 sections showing the results of inverse modeling of resistivity and chargeability data from electrical surveys along 6 traverses. Each section displays the subsurface resistivity and chargeability values derived from the inversion of the field data collected along the traverse. The resistivity and chargeability values are plotted with depth below the surface to provide a 2D image of the subsurface geology along the profile.

2. Limestone quarry Recent
BeninRepublic
Ibadan
Ibadan
Oligocene to
recent
Eocene
Paleocene
Cretaceous
Precambrian
Study area
Alluvium
Benin formation
Ilaro formation
Oshosun formation
Ewekoro formation
Abeokuta formation
Basement complex
0 60 120 km
Atlantic Ocean

3. A1
A
A
A1
B1
B1
B
BInverse model resistivity section
0 16.0 32.0 48.0 64.0 80.0 96.0 m
Iteration 5 RMS error = 4.7%
0.250
0.752
1.260
1.770
2.290
2.810
41.2 58.2 82.1 116 163 230 325 458
DepthDepth
0.250
0.752
1.260
1.770
2.290
2.810
Resistivity in ohm.m Unit electrode spacing 1.00 m
0 16.0 32.0 48.0 64.0 80.0 96.0 m
Iteration 5 RMS error = 0.14
Inverse model chargeability section
0.409 0.497 0.604 0.734 0.892 1.08 1.32 1.60
Chargeability in msec Unit electrode spacing 1.00 m

4. Inverse model chargeability resistivity section
0 16.0 32.0 48.0 64.0 80.0 96.0 m
IP Traverse 2
Iteration 3 RMS error = 4.2%
0.250
0.752
1.260
1.770
2.290
2.810
77.3 101 133 174 229 300 393 515
DepthDepth
0.250
0.752
1.260
1.770
2.290
2.810
Resistivity in ohm.m Unit electrode spacing 1.00 m
0 16.0 32.0 48.0 64.0 80.0 96.0 m
Iteration 3 RMS error = 0.19
Inverse model chargeability section
0.750 0.881 1.03 1.22 1.43 1.68 1.97 2.31
Chargeability in msec Unit electrode spacing 1.00 m
Inverse model resistivity section
0 16.0 32.0 48.0 64.0 80.0 96.0 m
IP Traverse 3Iteration 5 RMS error = 7.2%
0.250
0.752
1.260
1.770
2.290
2.810
61.3 86.3 122 171 242 340 480 676
DepthDepth
0.250
0.752
1.260
1.770
2.290
2.810
Resistivity in ohm.m Unit electrode spacing 1.00 m
0 16.0 32.0 48.0 64.0 80.0 96.0 m
Iteration 5 RMS error = 0.16
Inverse model chargeability section
0.245 0.313 0.401 0.513 0.656 0.839 1.07 1.37
Chargeability in msec Unit electrode spacing 1.00 m

5. 0 16.0 32.0 48.0 64.0 80.0 96.0 m
IP Traverse 4
Iteration 5 RMS error = 4.2%
0.250
0.752
1.260
1.770
2.290
2.810
80.3 106 140 185 244 323 426 563
DepthDepth
0.250
0.752
1.260
1.770
2.290
2.810
Resistivity in ohm.m Unit electrode spacing 1.00 m
0 16.0 32.0 48.0 64.0 80.0 96.0 m
Iteration 5 RMS error = 0.11
Inverse model chargeability section
Chargeability in msec Unit electrode spacing 1.00 m
0.692 0.790 0.901 1.03 1.17 1.34 1.52 1.74
Inverse model resistivity section
C
C
D
D
C1
C1
D1
D1
0 16.0 32.0 48.0 64.0 m
IP Traverse 5Iteration 5 RMS error = 6.3%
0.250
0.752
1.260
1.770
2.290
2.810
49.9 68.9 95.0 131 181 250 344 475
DepthDepth
0.250
0.752
1.260
1.770
2.290
2.810
Resistivity in ohm.m Unit electrode spacing 1.00 m
0 16.0 32.0 48.0 64.0 m
Iteration 5 RMS error = 0.29
Inverse model chargeability section
Chargeability in msec Unit electrode spacing 1.00 m
0.482 0.633 0.832 1.09 1.44 1.89 2.48 3.26
Inverse model resistivity section
E F
E1
F1
E F
E1
F1

6. IP Traverse 6
Iteration 5 RMS error = 6.6%
0.250
0.752
1.260
1.770
2.290
2.810
48.1 66.9 93.2 130 181 252 350 488
DepthDepth
0.250
0.752
1.260
1.770
2.290
2.810
Resistivity in ohm.m Unit electrode spacing 1.00 m
Iteration 5 RMS error = 0.17
Chargeability in msec Unit electrode spacing 1.00 m
0.256 0.332 0.429 0.556 0.720 0.932 1.21 1.56
0 16.0 32.0 48.0 64.0 m
0 16.0 32.0 48.0 64.0 m
Inverse model resistivity section
Inverse model chargeability section