Ahyi Volcano
Updated: Mar 17, 2025 03:21 GMT -
Submarine volcano
United States, Mariana Islands, 20.42°N / 145.03°E 
Summit height: -137 m / - 449 ft
Current status: normal or dormant (1 out of 5)
Last update: 12 Mar 2025 (Smithsonian / USGS Weekly Volcanic Activity Report)
3D model of Ahyi seamount volcano (image via GVP)
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Ahyi volcano eruptions: 1979?, 2001, 2014, 2022 (mid Oct - ongoing, to be confirmed)
Latest nearby earthquakes
| Date and Time | Mag / Depth | Distance / Location | |||
|---|---|---|---|---|---|
Background
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. Water discoloration has been observed over the submarine volcano, and in 1979 the crew of a fishing boat felt shocks over the summit area of the seamount followed by upwelling of sulfur-bearing water. On April 24-25, 2001 an explosive submarine eruption was detected seismically from a seismic station on Rangiroa Atoll, Tuamotu Archipelago. The event was well constrained (+/- 15 km) at a location near the southern base of Ahyi; the summit of the seamount lies within the location uncertainty.---
Smithsonian / GVP volcano information
Significant volcanic eruptions: Ahyi volcano
In the past 10,000 years, Ahyi has had at least 11 confirmed eruptions, all documented by historical records or observations. There is one uncertain or discredited eruption in 1979 from Ahyi volcano.
The table below lists all known eruptions (date in bold face) of Ahyi volcano in historic times and during the past 10,000 years. Updates on the most recent volcanic activity of Ahyi can be found on the news page of Ahyi volcano.
| Date | Note | VEI | Deaths | Damage | |
|---|---|---|---|---|---|
Historical obs./docs. | ? | ||||
Historical obs./docs. | ? | ||||
Historical obs./docs. | 1 | ||||
| Summit crater and SE slope Historical obs./docs. | 2 | ||||
| S of Ahyi (20.34 N, 145.02 E) Historical obs./docs. | 0 | ||||
Historical obs./docs. | 0 | ||||
| SW of Ahyi (~20.3 N, 144.9 E) Historical obs./docs. | 0 | ||||
| SW of Ahyi Historical obs./docs. | 0 | ||||
?? | Uncertain Eruption Historical obs./docs. | 0 | |||
| S of Ahyi (20.24 N, 145.02 E) Historical obs./docs. | 0 | ||||
| SW of Farallon de Pájaros Historical obs./docs. | 0 | ||||
| Vicinity of Farallon de Pájaros Historical obs./docs. | 1 | ||||
Remark:
Our list of volcanic eruptions closely follows the database of eruptions of the Smithsonian's Global Volcanism Project (GVP), the internationally most recognized data source for volcanic eruptions, but also includes significant eruptive episodes or related volcano events. "Volcanic eruptions" are usually to be understood as sequences of individual eruptive episodes that can follow each other, or even overlap (if several vents are involved), and can last many years, decades or even longer. For example, the current activity of Stromboli volcano is understood as a single eruption that has been ongoing since 1934.
Sources: NOAA National Centers for Environmental Information (NCEI), Global Significant Volcanic Eruptions Database. doi:10.7289/V5TD9V7K | Global Volcanism Project / Smithsonian Institution
Ahyi Volcano FAQ
+When was the last eruption of Ahyi volcano?
The last confirmed eruption of Ahyi occurred in 2024.
+How often does Ahyi volcano erupt?
There are no known historic eruptions, but evidence from geologic records shows that it has had at least 11 eruptions over the past 10,000 years. This number is likely much higher because many past eruptions might not have left evidence recognizeable today and/or the volcano might not have been studied in too much detail. Using the available data, a very conservative estimate is that Ahyi volcano erupts every 909 years.
+How active is Ahyi volcano at present?
Ahyi volcano is infrequently active: Since 1900, it has had 11 eruptions, and been active during 11 years out of 126 as of now. This means, Ahyi has been in eruption one in 11.5 years on average. The last eruption was in 2024 and ended 3 months ago.
+When was the largest eruption of Ahyi volcano?
The largest eruption of Ahyi volcano in historic times occurred in 2014. It ranks as a strombolian to vulcanian eruption with a magnitude 2 on the VEI (Volcanic Explosivity Index) scale.
Latest satellite images
Ahyi Volcano Maps
Below is a selection of maps showing the location and surroundings of the volcano at various resolutions based on aerial-imagery / terrain maps. Feel free to use them for non-commercial purposes on your blog or website as long as you credit them with a link back to this page (click to copy it).
Satellite/aerial-type map of Ahyi volcano (world scale)
Terrain-type map of Ahyi volcano (world scale)
Satellite/aerial-type map of Ahyi volcano (region scale large)
Terrain-type map of Ahyi volcano (region scale large)
Satellite/aerial-type map of Ahyi volcano (region scale medium)
Terrain-type map of Ahyi volcano (region scale medium)
Satellite/aerial-type map of Ahyi volcano (region scale small)
Terrain-type map of Ahyi volcano (region scale small)
Satellite/aerial-type map of Ahyi volcano (local scale large)
Terrain-type map of Ahyi volcano (local scale large)
Satellite/aerial-type map of Ahyi volcano (local scale medium)
Terrain-type map of Ahyi volcano (local scale medium)
Satellite/aerial-type map of Ahyi volcano (local scale small)
Terrain-type map of Ahyi volcano (local scale small)
Satellite/aerial-type map of Ahyi volcano (scale of 10s of km)
Terrain-type map of Ahyi volcano (scale of 10s of km)
Satellite/aerial-type map of Ahyi volcano (scale of 20-40 km)
Terrain-type map of Ahyi volcano (scale of 20-40 km)
Satellite/aerial-type map of Ahyi volcano (scale of approx. 10-20 km)
Terrain-type map of Ahyi volcano (scale of approx. 10-20 km)
Satellite/aerial-type map of Ahyi volcano (scale of 5-10 km)
Satellite/aerial-type map of Ahyi volcano (scale of few kilometers)
