Fig. 8

BSR-derived heat flows. a Comparison of heat flows from the BSRs, probe measurements, and borehole measurements off the Kii Peninsula. Colored symbols indicate heat flows measured by probes [squares from Kinoshita et al. (2008), stars from Hamamoto et al. (2011)], boreholes [triangles from Shipboard Scientific Party (1975, 1986a, b), Taira et al. (1991), Moore et al. (2001), Harris et al. (2011), and Marcaillou et al. (2012)], and BSRs (colored dots from this study). Larger sizes of the square and star symbols reflect better data quality as defined by the authors. Gray lines represent survey lines, and thick lines represent modeled survey lines. The black frame bounds a 60 km wide area encompassing five modeling sections and probe data. b Cross plot showing the topographically uncorrected BSR-derived heat flow and probe heat flow within approximately 1 km of the Kumano Basin. The differences between the heat flows from BSRs and from probes in neighboring areas fall within a range of 20%, except at two sites, which are thought to be affected by fluid expulsion (Hamamoto et al. 2011). c Heat flow profiles along the transect bounded by the black frame in (a). The profiles include topographically uncorrected (black dots) and corrected (red dots) BSR-derived heat flows of five modeled seismic lines (gray thick lines within the black frame in (a). Although a sudden rise/drop of the heat flow is observed in the uncorrected data at distances from the trench axis of approximately 15 and 30 km, the change is tempered by topographic correction. The inset figure shows the topographically uncorrected (black dots) and corrected (red dots) BSR-derived heat flows of the five modeled seismic lines and probe heat flows [stars from Hamamoto et al. (2011)] from the black frame of (a)