Might this be caused by volcanic eruptions on the arctic ocean seabed described in the scientific media?

Sampling of such articles here:
(1) "Fire Under Arctic Ice: Volcanoes Have Been Blowing Their Tops In The Deep Ocean" http://www.sciencedaily.com/releases/2008/06/080625140649.htm
(2) "Arctic ocean volcano blew its top â" even under pressure" http://environment.newscientist.com/article/mg19826625.800
(3) "Arctic Volcanoes Found Active at Unprecedented Depths" http://news.nationalgeographic.com/news/2008/06/080626-arctic-volcano.html

Possible methods to resolve question:
(a) send robot submersible with video camera down the methane plume to see what is happening on the ocean floor (i.e. seeing is believing). Is it cold & dark or warm and glowing red?
(b) audit regional distribution of frozen methane on arctic ocean floor, plotting location/concentration relative to undersea arctic ocean volcanoes and hot-water vents
(c) place sensors on ocean floor to measure temperature & pressure

Many people would look foolish if it later turned out the frozen methane was melting due to localized heating of the seabed caused by magma (lava) flows and/or geysers spewing hot water as happens along various undersea ridges