Chiginagak
Stratovolcano in United States
Key Facts
Elevation
2,221 m (7,287 ft)
Type
Stratovolcano
Location
57.135°, -156.990°
Region
Alaska Peninsula Volcanic Arc
Rock Type
Andesite / Basaltic Andesite
Tectonic Setting
Subduction zone
Location
Loading map...
Overview
The symmetrical, glaciated Chiginagak stratovolcano locatedon the Alaska Peninsula ~15 km NW of Chiginagak Bay contains a small summit crater, which is breached to the south, and one or more summit lava domes. Lava domes occur high on the NW and SE flanks of the calc-alkaline volcano. An unglaciated lava flow and an overlying pyroclastic-flow deposit extending E from the summit are the most recent eruption products, which most likely originated from a lava dome on the SE flank, 1 km from the summit.
Brief ash eruptions were reported in July 1971 and August 1998. Fumarolic activity has bene reported on the NE flank, and two areas of hot-spring travertine deposition are located at the NW base near Volcano Creek.
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 | 28 years ago | Recent | Recently active |
Monitoring & Alert Status
Monitoring Networks
Current Status
Nearby Volcanoes in North America Volcanic Regions
Quick Info
- •Smithsonian ID: 312110
- •Evidence: Eruption Observed
- •Epoch: Holocene
About the Photo
Chiginagak is a glacier-covered edifice with hot springs near the base of the N flank. Recent eruption products include an unglaciated lava flow and an overlying block-and-ash-flow deposit on the east side.
Photo by Alaska Volcano Observatory, U.S. Geological Survey
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.