Extended Data Fig. 3: Additional evidence for long-distance gas migration.
From: Long-distance migration and venting of methane from the base of the hydrate stability zone
a) Map of the seabed from the base of slope to shelf break offshore of Mauritania. b) RMS amplitude map (See Methods) of the modern BSR showing bands of high seismic amplitude (1, 2 and 3) indicative of gas migration beneath the hydrate c) RMS amplitude map of an additional mapped reflection (dashed yellow reflection, R2 in d), showing areas of high seismic amplitude beyond the landward limit of hydrate. d) Seismic line d-d’ showing high amplitude yellow reflection (R2) down-dip of the pockmarks. e) Seismic line e-e’ showing a continuous high seismic amplitude reflection (blue dashed line) extending for ~ 18 km.
