Fig. 4: RMS amplitude maps showing the funnel and pockmarks.
From: Long-distance migration and venting of methane from the base of the hydrate stability zone
a–c, RMS seismic amplitude maps (Methods) for reflections 1 (a), 2 (b) and 3 (c), respectively, showing the intersections of the BHSZR and BHSZM, the HDZ, funnel and pockmarks. Inset 1: teardrop-shaped trails of higher seismic amplitude indicate the movement of methane below the BHSZM (ref. 28) within the funnel, supporting the conclusion that long-distance migration of methane has occurred. Yellow and green triangles, respectively, indicate the points of intersection between reflections 2 and 3 and the BHSZM. Yellow and green circles, respectively, indicate the points of intersection between reflections 2 and 3 and the BHSZR. Y, dip-parallel bands of higher seismic amplitude.
