Yuryaku Seamount (also called Yuryaku Guyot) is a seamount (underwater volcano) and guyot (flat-topped) located northwest of Hawaii. It is located a little southwest of the V-shaped bend separating the Emperor Seamounts from the older Hawaiian islands, all of the Hawaiian-Emperor seamount chain in the North Pacific Ocean.
Elevation of the Pacific seafloor, showing the Hawaiian-Emperor seamount chain, including Yuryaku Seamount a bit off of the V. The sharp "V" separates the Hawaiian Ridge from the older Emperor Seamount portion of the chain. Yuryaku is the center/northernmost and most elongated of the small grouping of three fairly small volcanoes near the bend.
|Type||Guyot, Hotspot volcano|
|Volcanic arc/chain||Hawaiian-Emperor seamount chain|
|Last eruption||43 million years ago|
Alkalic basalt dredged from Yuryaku Seamount is similar to the alkalic basalt that caps the volcanoes in the Hawaiian Islands. Analyses gave a mean age of 42.3 ± 1.6 m.y. for Yuryaku Seamount. The data collected helped show that the age of the Hawaiian-Emperor bend is about 41 to 43 m.y. Alkalic basalt have been sampled at Yuryaku Seamount.
The following outline is provided as an overview of and introduction to Oceanography.