Fig. 3

Inverted 3-D resistivity model showing the C-1 and C-2 anomalies. a Horizontal slices at depths of 0.1, 3, and 12 km (left) and west–east vertical cross sections at X = 7, 1, and – 5 km (right). Green diamonds and inverted triangles mark the MT sites. The purple polygons on the left panels and the thick purple lines at the top of the right-hand panels show the extent of the outcrop of the Shirikomadake serpentinite complex. b 3-D view of the region of low resistivity (< 10 Ω m) viewed from the northwest. The dashed line marks the upper limit of the zone in which we replaced resistivity values in the sensitivity tests for the C-2 anomaly