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Country: | United States | |
| Subregion Name: | Mariana Islands | ||
| Volcano Number: | 0804-211 | ||
| Volcano Type: | Submarine volcano | ||
| Volcano Status: | Historical | ||
| Last Known Eruption: | 2009 | ||
| Summit Elevation: | -517 m | - 1,696 feet | |
| Latitude: | 14.601°N | 14°36'4"N | |
| Longitude: | 144.775°E | 144°46'31"E | |
| A submarine volcano detected during a 2003 NOAA bathymetric survey of the Mariana Island arc was found to be hydrothermally active and named NW Rota-1. The basaltic to basaltic-andesite seamount rises to within 517 m of the sea surface SW of Esmeralda Bank and lies 64 km NW of Rota Island and about 100 km north of Guam. When Northwest Rota-1 was revisited in 2004, a minor submarine eruption from a vent named Brimstone Pit on the upper south flank about 40 m below the summit intermittently ejected a plume several hundred meters high containing ash, rock particles, and molten sulfur droplets that adhered to the surface of the remotely operated submersible vehicle. The active vent was funnel-shaped, about 20 m wide and 12 m deep. NW Rota-1 is a large submarine volcano with prominent structural lineaments about a kilometer apart cutting across the summit of the edifice and down the NE and SW flanks. | |||
