Koniuji
Stratovolcano in United States
Key Facts
Elevation
273 m (896 ft)
Type
Stratovolcano
Location
52.220°, -175.130°
Region
Aleutian Ridge Volcanic Arc
Rock Type
Andesite / Basaltic Andesite
Tectonic Setting
Subduction zone
Location
Loading map...
Overview
The very small, 1 x 1. 5 km Koniuji Island, between Atka and Kasatochi volcanoes, is the emergent top of a mostly submarine volcano. Located about 20 km N of the western side of Atka Island, the volcano is deeply dissected, with a steep, arcuate cliff on the west.
New Ar-Ar dating indicates that the island emerged above sea level aout 15,000 years ago, and that several lava flows and domes were erupted during the Holocene. The summit lava dome is younger than about 3,000 years. Reports of historical eruptive activity may be erroneous and are considered to refer to eruptions of the relatively undissected Kasatochi, 25 km W.
Volcanic Hazards & Risk Assessment
Primary Hazards
- Pyroclastic flows
- Lava flows
- Volcanic bombs and ballistics
- Lahars and mudflows
Risk Level
Geological Composition & Structure
Rock Types
Tectonic Setting
Age & Formation
Eruption Statistics & Analysis
| Metric | Value | Global Ranking | Significance |
|---|---|---|---|
| Total Recorded Eruptions | Unknown | Low | Moderately active volcano |
| Maximum VEI | VEI Unknown | Minor | Local impact potential |
| Recent Activity | 3176 years ago | Historical | Historically active |
Monitoring & Alert Status
Monitoring Networks
Current Status
Nearby Volcanoes in North America Volcanic Regions
Quick Info
- •Smithsonian ID: 311140
- •Evidence: Eruption Dated
- •Epoch: Holocene
About the Photo
A steep, arcuate cliff drops nearly 300 m to the coast on the western side of Koniuji Island. This small, 1 x 1.5 km wide island, located between Atka Island and Kasatochi volcano, is the emergent top of a mostly-submarine volcano. A NE-trending fault is visible on the SE side of the island (right).
Photo by E. Bailey, 1982 (U.S. Fish and Wildlife Service).
Authority Sources
Related Volcanoes
Basic Information
This page shows basic data from the Smithsonian Global Volcanism Program. For more detailed information, visit the official Smithsonian page.