Augustine Volcano

Augustine is a stratovolcano in Cook Inlet, Alaska, covering the entirety of small Augustine Island. The summit area contains multiple lava domes and flows, surrounded by volcanic material that extends to the island's coastline.

The volcano suffered a major collapse during the 1883 eruption, triggering a tsunami in Cook Inlet. Since then, the mountain has reshaped itself through several more eruptions in the 20th and 21st centuries.

The Sugpiaq gave the mountain the name Utakineq, while the Dena'ina call it Chu Nula. Both of these indigenous names remain in use throughout the region today.

The Alaska Volcano Observatory monitors the island with seismic instruments to detect signs of activity. The island is uninhabited and difficult to reach, so visits usually occur by air or boat from a safe distance.

The island displays 11 different debris avalanche deposits that reached the sea within the last 2000 years. These deposits shaped the irregular coastline visible from the water today.

Location: Alaska

Elevation above the sea: 1,260 m

GPS coordinates: 59.36197,-153.42978

Latest update: December 20, 2025 14:55