Fig. 3: Representative seismic strike-line showing the modern and relict BSRs and the modelled magnitude of the shallowing of the BHSZ due to warming since the LGM.
From: Long-distance migration and venting of methane from the base of the hydrate stability zone
a, Strike-line intersecting Fig. 2. Yellow and green triangles, respectively, indicate the points of intersection of reflections 2 and 3 with the BHSZM. Yellow and green circles, respectively, indicate the points of intersection of reflections 2 and 3 with the BHSZR. Inset 1: zoom-in of the BHSZR and BHSZM showing the aligned high-amplitude terminations that are used to map the features. Inset 2: schematic of the configuration of the BHSZR, BHSZM and reflections 1, 2 and 3. HARTs, high-amplitude reflection terminations. b, Schematic of the funnel showing the orientations of the dip and strike lines (Fig. 2 and a, respectively) with the stratigraphy above the BHSZM not shown. c, Schematic hydrate phase diagrams for temperature–depth profiles for modern conditions (full yellow line) and those during the LGM (orange dashed line) for the location at the intersection of Fig. 2 and a in a mid-slope position. White boxes show the modelled magnitudes of the changes in the depth of the BHSZ, the temperature at the seabed and sea level.
