Volcano

Seamount X

Stratovolcano · -1,230 m · At Sea

Seamount X sits on the Mariana Plate, in a subduction zone.

Elevation

-1,230 m

Type

Stratovolcano

Tectonic Setting

Subduction zone

Dominant Rock

Basalt / Picro-Basalt

Plate

Mariana Plate

Country

At Sea

Last Eruption

unknown

Nearby Cities

Cities of more than 20,000 people within 100 km.

• 83 kmAgana122,000 people

Sources : Global Volcanism Program, 2026. Volcanoes of the World (v. 5.4.0; 7 Aug 2026), Smithsonian Institution, doi:10.5479/si.GVP.VOTW5-2026.5.4 (volcano.si.edu) · NOAA NCEI · USGS · Wikidata