The United States Geological Survey - Northern Mariana Islands (USGS-NMI) reported that unrest continued at Ahyi between 15 August 2025 (local) and 22 August 2025 (local). The alert level at Ahyi remained at "Unassigned" (on a 4-level scale). The aviation alert level remained at "Unassigned" (on a 4-level scale).
The United States Geological Survey - Northern Mariana Islands (USGS-NMI) reported that unrest continued at Ahyi between 15 August 2025 (local) and 22 August 2025 (local). The alert level at Ahyi remained at "Unassigned" (on a 4-level scale). The aviation alert level remained at "Unassigned" (on a 4-level scale).
Wed, 30 Jul 2025, 14:00
At 1047 on 24 July both the Aviation Color Code and the Volcano Alert Level for Ahyi Seamount were lowered to Unassigned because signs of unrest had declined, and discolored seawater over the seamount was last observed on 28 May. The latest phase of activity began in August 2024 and was characterized by visible plumes of discolored seawater observed sporadically in satellite images.
Read allThu, 24 Jul 2025, 10:00
At 1047 on 24 July both the Aviation Color Code and the Volcano Alert Level for Ahyi Seamount were lowered to Unassigned because signs of unrest had declined, and discolored seawater over the seamount was last observed on 28 May. The latest phase of activity began in August 2024 and was characterized by visible plumes of discolored seawater observed sporadically in satellite images.
Read allWed, 4 Jun 2025, 14:00
Unrest at Ahyi Seamount continued during 24-30 May. A small plume of discolored water in the vicinity of the seamount was identified in a satellite image on 28 May, indicating possible submarine activity. Possible infrasound signals coming from the direction of Ahyi were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E) on 29 May.
Read allWed, 28 May 2025, 14:00
No activity at the Ahyi Seamount was detected in either satellite or acoustic data from underwater pressure sensors near Wake Island (about 2,270 km E) during 17-23 May, though unrest continued. The Exploration Vessel Nautilus visited the area and deployed a remotely operated vehicle (ROV) on 19 May. The observations confirmed that lava had erupted over the past few years, building the summit to within 50-60 m of the ocean surface.
Read allThu, 22 May 2025, 10:00
No activity at the Ahyi Seamount was detected in either satellite or acoustic data from underwater pressure sensors near Wake Island (about 2,270 km E) during 17-23 May, though unrest continued. The Exploration Vessel Nautilus visited the area and deployed a remotely operated vehicle (ROV) on 19 May. The observations confirmed that lava had erupted over the past few years, building the summit to within 50-60 m of the ocean surface.
Read allWed, 7 May 2025, 14:00
Unrest at Ahyi Seamount continued during 25 April-1 May. Discolored water in the vicinity of the seamount was last identified in a satellite image on 25 April, indicating possible submarine activity. Signals coming from the direction of Ahyi were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E) during 28 April-1 May.
Read allWed, 30 Apr 2025, 14:00
Unrest at Ahyi Seamount may have continued during 18-25 April. Signals coming from the direction of Ahyi were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi) on 18 and 20 April. No signs of activity at the ocean's surface were identified in satellite images.
Read allWed, 16 Apr 2025, 14:00
Unrest at Ahyi Seamount may have continued during 4-11 April. A diffuse plume of discolored water in the vicinity of the seamount was last identified in a satellite image on 30 March, indicating possible submarine activity. No signals coming from the direction of Ahyi were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi), though sporadic data outages occurred during the week.
Read allWed, 9 Apr 2025, 14:00
Unrest at Ahyi Seamount may have continued during 28 March-5 April. A diffuse plume of discolored water in the vicinity of the seamount was last identified in a satellite image on 30 March, indicating possible submarine activity. No signals coming from the direction of Ahyi were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi).
Read allThu, 3 Apr 2025, 06:00
Unrest at Ahyi Seamount may have continued during 21-28 March. A diffuse plume of discolored water in the vicinity of the seamount was last identified in a satellite image on 15 March, indicating possible submarine activity. 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).
Read allThu, 3 Apr 2025, 02:00
Unrest at Ahyi Seamount continued during 14-21 March. A diffuse plume of discolored water in the vicinity of the seamount was identified in a satellite image on 15 March, indicating possible submarine activity. 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).
Read allWed, 2 Apr 2025, 22:00
Unrest at Ahyi Seamount continued during 14-21 March. A diffuse plume of discolored water in the vicinity of the seamount was identified in a satellite image on 15 March, indicating possible submarine activity. 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).
Read allWed, 2 Apr 2025, 18:00
Unrest at Ahyi Seamount continued during 14-21 March. A diffuse plume of discolored water in the vicinity of the seamount was identified in a satellite image on 15 March, indicating possible submarine activity. 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).
Read allWed, 2 Apr 2025, 14:00
Unrest at Ahyi Seamount continued during 14-21 March. A diffuse plume of discolored water in the vicinity of the seamount was identified in a satellite image on 15 March, indicating possible submarine activity. 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).
Read allWed, 26 Mar 2025, 15:00
Unrest at Ahyi Seamount continued during 14-21 March. A diffuse plume of discolored water in the vicinity of the seamount was identified in a satellite image on 15 March, indicating possible submarine activity. 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).
Read allWed, 19 Mar 2025, 15:00
Unrest at Ahyi Seamount continued during 7-14 March. A few hydroacoustic detections coming from the direction of Ahyi were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi). Weather clouds obscured satellite views of the seamount.
Read allWed, 12 Mar 2025, 15:00
Unrest at Ahyi Seamount continued during 28 February-7 March. A plume of discolored water in the vicinity of the seamount was identified in a satellite image on 3 March, indicating possible submarine activity. Weather clouds obscured views during the rest of the week.
Read allWed, 5 Mar 2025, 15:00
Unrest at Ahyi Seamount continued during 21-28 February. Occasional weak signals coming from the direction of Ahyi were 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).
Read allWed, 26 Feb 2025, 15:00
Unrest at Ahyi Seamount continued during 13-21 February. A plume of discolored water in the vicinity of the seamount was identified in satellite images during 14-16 February, indicating possible submarine activity. No signals coming from the direction of Ahyi were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi).
Read allWed, 19 Feb 2025, 15:00
Unrest at Ahyi Seamount continued during 7-13 February. A satellite image on 8 February showed a plume of discolored water in the vicinity of the seamount, indicating possible submarine activity. 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).
Read allWed, 12 Feb 2025, 15:00
Unrest at Ahyi Seamount continued during 31 January-7 February. A satellite image on 1 February showed a plume of discolored water in the vicinity of the seamount, indicating possible submarine activity. Signals indicting minor activity coming from the direction of Ahyi were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi) on 3 and 5 February.
Read allWed, 29 Jan 2025, 15:00
Unrest at Ahyi Seamount continued through 24 January. Satellite images showed a plume of discolored water in the vicinity of the seamount on 18 January, indicating possible submarine activity. No signals coming from the direction of Ahyi were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi).
Read allWed, 22 Jan 2025, 15:00
Unrest at Ahyi Seamount continued through 17 January. Signals indicating activity, coming from the direction of Ahyi, were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi) on 9 January. Satellite images showed a distinct plume of discolored water originating from the seamount on 10 January.
Read allWed, 8 Jan 2025, 15:00
Unrest at Ahyi Seamount continued through 3 January. Signals indicating activity, coming from the direction of Ahyi, were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi) on 28 and 30 December (UTC). Satellite images showed possible signs of underwater activity on 27 and 28 December, and clearer signs on 2 January consisting of a plume of discolored water extending 2.3 km NNW.
Read allThu, 2 Jan 2025, 11:00
A plume of discolored water surrounding Ahyi Seamount was identified in satellite data on 15 December, indicating continued low-level unrest. Signals from underwater activity coming from the direction of Ahyi were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi) on 24 and 26 December (UTC). Satellite data from those days were obscured by clouds; no evidence of discolored water was identified in a partly cloudy satellite image from 25 December.
Read all
Current status: normal or dormant (1 out of 5)
Ahyi volcano eruptions:
