Fig. 1: Map of the seabed offshore Mauritania from the base of the slope to the shelf break and imaging of the pockmarks, showing the locations of all other figures.
From: Long-distance migration and venting of methane from the base of the hydrate stability zone
a, Map of the seabed. Inset: the northwestern African margin. b, R.m.s. seismic amplitude map (Methods) of a reflection at the base of the field of large pockmarks in the area indicated in a.
