Isostatic rebound refers to the process of land rising or sinking to balance out the weight distribution caused by melting of glaciers or removal of heavy loads on the Earth's crust. Full definition
Take a look first at 1:08:40 which shows a methane emissions chart with high levels of emissions from the Laptev Sea (from earthquakes occurring along the Gekkal Ridge, resulting from increased seismic activity from isostatic rebound of Greenland from less mass holding it down). (neven1.typepad.com)
Reference: K. Wallmann, M. Riedel, W.L. Hong, H. Patton., A. Hubbard, T. Pape, C.W. Hsu, C. Schmidt, J.E. Johnson, M.E. Torres, K. Andreassen, C. Berndt, and G. Bohrmann, 2017: Gas Hydrate Dissociation off Svalbard Induced by Isostatic Rebound rather than Global Warming. (cage.uit.no)
Isostatic rebound continues to reshape the Great Lakes and other areas formerly under the weight of the ice sheets. (newworldencyclopedia.org)