Apparent resistivity (left) and phase (right) at Kakioka (top), Kanoya (middle), and Memambetsu (bottom). All of the four impedance tensor components at periods of less than 104 s are shown as Z
xx (yellow triangles), Z
xy (red circles), Z
yx (blue squares), and Z
yy (green inverted triangles). KAK, Kakioka; KNY, Kanoya; MMB, Memambetsu.