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The Extreme Methane Emission Zone at the junction of the Laptev Sea and the Eurasian Basin is marked by a particular type of methane hydrate associated with hydrothermal emanations from the slow-spreading Gakkel Ridge (Figure 5; Max and Lowrie 1993). Another belt of these Gakkel Ridge hydrothermal methane hydrates also occurs along the plate boundary zone north and west of Svalbard (Figure 5; Max and Lowrie, 1993). This suggests a much deeper source zone for the methane in these hydrothermal methane hydrate regions than found elsewher in the Arctic.

The location of the Enrico Pv (sound pressure wave velocity) Anomaly at the junction of the Eurasian Basin and Laptev Sea is shown in Figure 6 at 100 km and 220 km depth within the asthenosphere part of the Earth's mantle (from Yakovlev et al. 2012). The Enrico Pv Anomaly occurs beneath the region (Figure 2) where there are deep hydrothermal methane hydrates (Figure 5; Max and Lowrie 1993) and the Extreme Methane Emission Zone occurs (Figure3b Light 2012; Carana 2013, 2014). The centre of the Enrico Pv Anomaly is marked by a pressure sound wave velocity anomaly (dv/V)% of about -1.6 (Yakovlev et al. 2012).

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