| Start date | Coordinate | Length (m) | Electrode | |||
---|---|---|---|---|---|---|---|
Type | Size (m × m) | Number/site | Depth (m) | ||||
N-S line | 1 August 1932 | M | 100 | Cu | 0.7 × 0.7 | 2 | 3 |
1 August 1933 | M | 1,120 | Cu | 1 × 1 | 2 |  | |
5 May 1937 | M | 1,040 | Cu | 1 × 1 | 2 |  | |
10 January 1944 | M | 895 | Cu | 1 × 1 | 2 |  | |
1 August 1948 | M | 900 | C | 0.3 × 0.05 | 2 |  | |
1 February 1988 | G | 180 | Pb-PbCl2 | 0.2 × 0.05 | 1 | 4 to 1.5 | |
1 September 1990 | G | 300 | Pb-PbCl2 | 0.2 × 0.05 | 1 | ~3 | |
1 July 1991 | G | 180 | Pb-PbCl2 | 0.2 × 0.05 | 1 | ~3 | |
1 September 1992 | G | 180 | Cu | 1 × 0.5 | 1 | ~3 | |
E-W line | 1 August 1932 | M | 100 | Cu | 0.7 × 0.7 | 2 | 3 |
1 August 1933 | M | 1,500 | Cu | 1 × 1 | 2 |  | |
1 March 1983 | M | 1,200 | Cu | 1.4 × 0.4 (W) | 2 | ~3 | |
1 February 1988 | G | 190 | Pb-PbCl2 | 0.2 × 0.05 | 1 | 4 to 1.5 | |
1 January 1993 | G | 190 | Cu | 1 × 0.5 | 1 | ~3 |