Kōkō Seamount (Japanese: 光孝海山) is an underwater mountain located in the Pacific Ocean. It belongs to the long chain of submarine volcanoes known as the Hawaiian–Emperor seamount chain.
Nature of the feature
The structure is an extinct underwater volcano and is classified as a seamount. Its summit has been planed flat by erosion and subsidence, so it is also identified as a guyot or tablemount; the name "Kōkō Guyot" is sometimes used.
Age and geology
Radiometric and stratigraphic studies indicate the last volcanic activity from Kōkō occurred about 48 million years ago. Different parts of the edifice have slightly different ages: the northern flank has been dated to at least 52.6 million years old, while material from the southern side yields an age near 50.4 million years.
The seamount is named for Emperor Kōkō of Japan.