Figure 3: Location of the Investigator Fracture Zone with respect to the Toba Caldera.
From: The feeder system of the Toba supervolcano from the slab to the shallow reservoir
(a) Bathymetric and topographic map of the area adjacent to the Sunda subduction zone. The uplift around the Toba Caldera is highlighted by the red dotted line. The rectangle indicates the study area. (b) Longitude-directed derivative of the geoid model EIGEN-6C4 (ref. 11). Dots indicate the slab-related seismicity used in this study at two depth intervals (red: 50–120 km; yellow: 120–170 km). (c) P-velocity anomalies at 220 km depth according to the regional tomography model20. The dark blue line highlights the possible boundaries of the slab. In b and c, the black dotted line indicates the trench. Dashed lines depict ridges associated with the Investigator Fracture Zone (IFZ).
