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Table 1 Details of the geoelectric voltage observations at Kakioka from 1932 to the present

From: The characteristics of geoelectric fields at Kakioka, Kanoya, and Memambetsu inferred from voltage measurements during 2000 to 2011

  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
  1. The terms ‘N-S line’ and ‘E-W line’ denote the north–south and east–west measurement lines along which the geoelectric voltages are observed, respectively. M and G in the ‘Coordinate’ column denote the geomagnetic and geographic coordinate systems, respectively, which are used for electrode alignment. The electrode type is represented by either Cu (copper plate), C (carbon rod) or Pb-PbCl2 (pod with a Pb wire covered with PbCl2). The number per site for each electrode states how many plates or rods are combined to form an electrode at the end of the measurement line. ‘W’ in the ‘Size’ column indicates that the listed electrode size is for the electrode at the western end, which was replaced in 1983.
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