"The Catalog of Active Volcanoes of the World reported an eruption in 1924 from a submarine volcano east of Matua Island in the central Kuriles. Gorshkov (1970) noted confusion in the literature about the location of this eruption and placed it, based on the original description, north of Toporkovyi islet (Banzio-Iwa). A small ridge extending northward from Matua and Toporkovyi reaches to a shallow depth at this point."  -Smithsonian Volcano Archive
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