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The northern and central parts of the Okhotsk Sea is the epi-Mesozoic platform. The hetero-aged acoustic basement is represented by the deformed geosynclinal rocks from Cretaceous to Paleozoic and, probably, Precambrian. The slightly deformed sedimentary cover leveled the uneven surface of the acoustic basement, and this upper Paleogene-Neogene-cover filled the system of the structural basins. The general northwest to southeast and east-to-west trending taphrogenic horsts and grabens of the acoustic basement were formed due to extending and subsiding of the earth's crust during late Paleogene-Neogene time.
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