Bathymetry of the Pervenets Rise (Sea of Japan)

As a result of bathymetric studies, including survey with a multi-beam echo sounder, a map of the bottom relief of part of the Sea of Japan in the region of the Pervenets Rise was compiled. The length of the Rise is 60 km, and the width is 45 km. The Rise consists of two submeridional ridges - the Western and the Eastern. On the basis of complex using of bathymetric and single-channel seismoacoustic data, it was established that on the Rise there are numerous evidences of late Cenozoic tectonic-magmatic activation, presumably of the Pliocene-Pleistocene age. The results of this process are manifested here as a complex of volcanic objects, including explosive eruptions origin - numerous volcanoes (37 units), lava flows, volcano caldera and adventive craters. The height of the volcanoes is up to 300 m, and their diameter is 0.3–2.0 km. Differences in the structure of the Western and Eastern ridges of the Pervenets Rise were revealed. The volcano of a linear type with a length of about 22 km and width of about 3 km is located on the Western ridge. The volcano of the central type with a caldera is located on the Eastern ridge. The bowl of the caldera has a diameter of about 4 km. A complex structure of the caldera is found, which is expressed in the existence of three rings of volcanic structures around it, which may indicate several stages of activation of the volcano on the Eastern ridge of the Rise. It was found that the seamounts Petr Velikij and Siberia correspond to the northern and southern tops of the western ridge of the Pervenets Rise.

Sea of Japan, Pervenets Rise, Petr Velikij (Petr Velikiy) Seamount, Siberia Seamount, bathymetry, multi-beam echo sounder, volcanoes

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