Ahyi volcano, United States, Mariana Islands: news & activity updates

Ahyi volcano (Mariana Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 27 March-2 April 2024 (Continuing Activity)

Signs of unrest at Ahyi Seamount continued. Small (less than 2 km long) plumes of discolored seawater in the vicinity of the seamount were observed in satellite images during 22 and 24-26 March. 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 all

Ahyi volcano (Mariana Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 6 March-12 March 2024 (New Activity / Unrest)

Signs of unrest at Ahyi Seamount continued. A small plume of discolored seawater in the vicinity of the seamount was observed in a 5 March satellite image. 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 all

Ahyi volcano (Mariana Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 6 March-12 March 2024 (New Activity / Unrest)

Signs of unrest at Ahyi Seamount continued. A small plume of discolored seawater in the vicinity of the seamount was observed in a 5 March satellite image. 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 all

Ahyi volcano (Mariana Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 7 February-13 February 2024 (New Activity / Unrest)

Signs of unrest at Ahyi Seamount continued. Plumes of discolored seawater in the vicinity of the seamount were occasionally observed in satellite images during 2-9 February. No additional signs of unrest were identified in data collected by regional seismic stations or remote underwater pressure sensors located near Wake Island (2,270 km E of Ahyi). Read all

Ahyi volcano (Mariana Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 24 January-30 January 2024 (New Activity / Unrest)

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. Read all

Ahyi volcano (Mariana Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 17 January-23 January 2024 (New Activity / Unrest)

Signs of unrest at Ahyi Seamount continued. Plumes of discolored water extending 4-4.5 km from the summit area were identified in satellite images during 21-23 January. No volcanic activity was identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi). Read all

Ahyi volcano (Mariana Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 10 January-16 January 2024 (New Activity / Unrest)

Signs of unrest at Ahyi Seamount were observed during the previous few weeks. Plumes of discolored water drifting as far as 10 km from the vent were identified in satellite data on 24 December 2023 and again on 4 and 10 January 2024. Hydroacoustic arrays located on Wake Island did not record any significant signals, though submarine plumes have been observed in the past without clear hydroacoustic evidence. Read all

Ahyi volcano (Mariana Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 27 December-2 January 2024 (Continuing Activity)

A plume of discolored water in the vicinity of Ahyi Seamount was observed in satellite images on 1 January. The plume possibly signified underwater volcanic activity but that interpretation could not be confirmed because pressure sensors at Wake Island were not operational; more distant sensors did not record any activity. Both the Aviation Color Code and the Volcano Alert Level remained at Unassigned. Read all