Geoelectric fields at Kakioka (a, b), Kanoya (c, d), and Memambetsu (e, f). The northward (E
x; a, c, e) and eastward (E
y; b, d, f) components of the geoelectric field from 12:00 to 24:00 on 24 October 2003 at the three sites are shown. One-minute values are used. KAK, Kakioka; KNY, Kanoya; MMB, Memambetsu.