Kuril Arc at 46.3°N

A shallow flat-topped edifice ~8 km in diameter, with depths from 0-50 m, is located in the Urup Strait ~15 km S of the Chernyye Brat'ya (Black Brothers) islands and ~20 km ENE of Urup Island in the Kuril Islands. Although visible using satellite bathymetry and appearing simply as a shallow platform on a map in Blokh et al. (2019) rather than a previously identified volcanic seamount, there is no available research about this edifice. Two reports of uncertain volcanic activity are assigned to this feature. This volcano number was previously created and placed at a location 7.5 km SE of the coast of Urup (~35 km SW), due to reported bubbling water seen from a fishing boat in March 1978 (SEAN 03:05), but was removed from the catalog due to insufficient evidence of any volcanic features. Hydrophones signals detected in April 1972 were interpreted to be from a submarine eruption in the Kuriles, probably between Simushir and Urup Island (Smithsonian CSLP 33-72). This activity was previously arbitrarily linked to Arkhangelsky, the submarine feature most centrally located between Urup and Simushir Islands, but has been reassigned following research showing a Pleistocene age for that massif.