Segula
Stratovolcano in United States
Key Facts
Elevation
1,160 m (3,806 ft)
Type
Stratovolcano
Location
52.015°, 178.136°
Region
Aleutian Ridge Volcanic Arc
Rock Type
Andesite / Basaltic Andesite
Tectonic Setting
Subduction zone
Location
Loading map...
Overview
The 6 x 7 km island of Segula east of Kiska volcano consists of a conical stratovolcano cut by a prominent NNW-SSE-trending fissure that extends to sea level at both ends of the island. The northern end of the fissure is flooded by the sea to produce a long, narrow cove. Segula was constructed above a 100-m-deep submarine platform that extends eastward to Khvostof and Davidof islands.
A submarine debris-avalanche deposit extends up to 18 km offshore to the north. The summit contains a small, poorly defined caldera that is partly overtopped on the south by a cinder cone that forms the high point of the island and on the north by extensive lava flows that reach the NE coast along a broad front. Another lava field on the SE coast originated from a cinder cone at 300 m elevation on the SE flank.
No historical eruptions are known, but Nelson (1959) considered fresh lava flows on the N flank to possibly be only a few hundred years old.
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 | Unknown | Historical | Historically active |
Monitoring & Alert Status
Monitoring Networks
Current Status
Nearby Volcanoes in North America Volcanic Regions
Quick Info
- •Smithsonian ID: 311030
- •Evidence: Evidence Credible
- •Epoch: Holocene
About the Photo
The 6 x 7 km Segula island is seen offshore from the SW. It has a prominent NNW-SSE-trending fissure that extends to sea level at both ends of the island. The summit contains a small, poorly defined caldera that has a scoria cone forming the high point of the island.
Photo by Christina Neal, 2005 (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.