Find U.S. Volcano
Ahyi seamount is a large conical submarine volcano that rises to within 137 m of the sea surface about 18 km SE of the island of Farallon de Pajaros (Uracas) in the northern Marianas.
Location: Commonwealth of the Northern Mariana Islands
Latitude: 20.42° N
Longitude: 145.03° E
Elevation: -75 (m) -246 (f)
Volcano type: Submarine
Composition: Andesite - Basalt
Most recent eruption: 2023 CE
Threat Potential: Very low*
*based on the National Volcano Early Warning System
Ahyi seamount is a large conical submarine volcano that rises to within 75 m of the ocean surface ~18 km SE of the island of Farallon de Pajaros in the northern Marianas. Water discoloration has been observed there, and in 1979 the crew of a fishing boat felt shocks over the summit area, followed by upwelling of sulfur-bearing water. On 24-25 April 2001 an explosive eruption was detected seismically by a station on Rangiroa Atoll, Tuamotu Archipelago. The event was well constrained (± 15 km) at a location near the southern base of Ahyi. An eruption in April-May 2014 was detected by NOAA divers, hydroacoustic sensors, and seismic stations.