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Earth, Planets and Space
Fig. 6 | Earth, Planets and Space

Fig. 6

From: Identification of active faults and tectonic features through heat flow distribution in the Nankai Trough, Japan, based on high-resolution velocity-estimated bottom-simulating reflector depths

Fig. 6

Distribution of (a) BSR temperature and (b) heat flow off the Kii Peninsula. Thick and thin lines show our results and the results of Ohde et al. (2018), respectively. Note that the range of the color scale in (b) is limited to 30–60 mW/m2 so as to emphasize heat flow anomalies caused by fluid migration. Higher values are omitted. (c) Location of active faults related to erosion or fluid migration, which are inferred from our interpretation of topography heat flow, and seismic profiles. The topographic feature is shown as slope angles derived from high-resolution bathymetry. (d) Heat flow in this study area with geological features superimposed. The black dashed circle and yellow dashed region indicate the zone with the anomalous high heat flow and the extremely high heat flow area (EHFA), shown in Fig. 5a, respectively. The yellow translucent area with depth contours indicates the distribution of plutonic rocks, inferred from on-land exposures and apparent beneath an unconformity between the cover sediment and the igneous basement on the seismic profiles (Kimura et al. 2022)

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