Western an eastern margins of Pacific Ocean presents numerous gashydrates sites, distributed as Gashydrates Provinces (referred to the sea's title) which can be combined to Circum Pacific Gashydrate Belt. Gas (mainly met~ane) hydrates accumulation induced by varies active geological features determined by geodynamic and tectonic type and seismic state's of Pacific and adjoining lithosphere plate's borders. Bering Sea, Okhotsk Sea, Japan Sea, East-China Sea, East Vietnam Sea, Celebes and Sulu Seas and southward to New Zealand offshore presents Western Pacific Gas Hydrate Belt and exposed methane hydrates distribution in sediments. Hydroacoustic, seismics, coring were a prime methods applied to gashydrate searching and exploration. Methane hydrates was explored since 88-th. (Okhotsk Sea). Gas hydrates supplying fluid within the thick Cenozoic sediment basins (up to 10 Ian thickness) are linked to multiple hydrocarbon accumulations: mainly oil and gas deposits, and gas (methane) hydrates proved for the Bering, Okhotsk and Japan Seas. Submarine gas seepage usually accompanied by contrast seismic and acoustic anomalies in the sediments and water column (e.x. up to 700 gas "flares" prior to 2010 indicates gas hydrate fracture type accumulation in western Okhotsk Sea). High hydrocarbons were found as well, but methane is dominated everywhere. Methane sources discussed as mixture of thermogenic and biogenic origin. Gas hydrate occupies mainly 20-45 percent of pore volume. BSR was found globally, but this border means not gas hydrate stability zone only. Methane resources trapped in Western Pacific gas hydrates belt estimated based on latest investigations at least for 5x10 exponent 13 cubic meters.