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Report on Ahyi (United States) — 24 January-30 January 2024


Ahyi

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 24 January-30 January 2024
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2024. Report on Ahyi (United States) (Sennert, S, ed.). Weekly Volcanic Activity Report, 24 January-30 January 2024. Smithsonian Institution and US Geological Survey.

Weekly Report (24 January-30 January 2024)

Ahyi

United States

20.42°N, 145.03°E; summit elev. -75 m

All times are local (unless otherwise noted)


Signs of unrest at Ahyi Seamount continued. Plumes of discolored water extending as far as 19 km from the summit area were identified in satellite images during 23-26 January. Weather clouds obscured or mostly obscured views during the rest of the week. No volcanic activity was identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi). The Aviation Color Code remained at Yellow (the second lowest level on a four-color scale) and the Volcano Alert Level remained at Advisory (the second lowest level on a four-level scale).

Geological Summary. 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.

Source: US Geological Survey