Portland Castle, Dorset - English Heritage

PORTLAND CASTLE
Selected GPR profiles, November 2012
Figure 3
Line 0
S
N
0
Line 3
S
N
0
Two-way travel time [ns]
10
0.45
20
0.9
30
1.35
40
1.8
50
2.25
0.00 1.25 2.50 3.75 5.00 6.25 7.50 8.75
Distance [m]
Line 1
S
GPR6
N
0
GPR4
GPR5
Depth [m]
Two-way travel time [ns]
10
0.45
20
0.9
30
GPR14
1.35
40
1.8
50
2.25
0.00 1.25 2.50 3.75 5.00 6.25 7.50 8.75
Distance [m]
Line 4
S
N
0
Depth [m]
Two-way travel time [ns]
10
20
GPR3
0.45
0.9
GPR16
30
40
50
GPR12
GPR15
1.35
1.8
2.25
0.00 1.25 2.50 3.75 5.00 6.25 7.50 8.75
Line 2
S
Distance [m]
GPR1 GPR2
N
0
Depth [m]
Two-way travel time [ns]
10
0.45
20
0.9
30
1.35
40
1.8
50
2.25
0.00 1.25 2.50 3.75 5.00 6.25 7.50 8.75
Distance [m]
Line 5
S
N
0
Depth [m]
Two-way travel time [ns]
10
0.45
20
0.9
30
1.35
40
1.8
50
2.25
0.00 1.25 2.50 3.75 5.00 6.25 7.50 8.75
Distance [m]
Depth [m]
Two-way travel time [ns]
10
GPR10
GPR7 GPR8
GPR9
0.45
20
0.9
30
1.35
40
1.8
50
2.25
0.00 1.25 2.50 3.75 5.00 6.25 7.50 8.75
Distance [m]
Depth [m]
Geophysics Team 2013
Low
High
relative reflector strength