"Bubbling water and seismicity were reported at this location, about 8 km East of Urup Island, in 1978, but it is not certain whether the activity resulted from an eruption (Scientific Event Alert Network, 1978). The longitude was given as 151 degrees 30 minutes in the original report (Japan Meteorological Agency), but the described locality appears to be near 150 degrees 30 minutes. Bathymetric work does not reveal any submarine volcanoes east of Urup Island (Antonov 1991, pers. comm.). The depth at this location is about 100 m."  -Smithsonian Volcano Archive
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