Figure 1: Bathymetry and core location from Storfjordrenna gas hydrate mounds.

(a) Bathymetry of the Storfjordrenna gas hydrate mounds (GHMs) area. 920GC in a shows the location of a coring site with steady-state porewater profiles (Fig. 3). (b) The hydroacoustic flare observed only from the summit of the mound. AA' indicates the line of hydroacoustic survey as marked in c which shows the detailed bathymetry of the studied GHM. We recovered gas hydrates from three of the study sites (red dots). Notice the different distance scales for the AA’ transects in b,c.