Mount Okmok
E539114
Mount Okmok is a large volcanic caldera on Alaska’s Aleutian Islands known for its explosive eruptions and significant impact on regional and even global climate.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Mount Okmok canonical | 1 |
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
shield volcano
ⓘ
volcanic caldera ⓘ |
| associatedWith | possible link to global climate anomalies around 43–41 BCE ⓘ |
| calderaDiameter |
approximately 10 kilometers
ⓘ
approximately 6 miles ⓘ |
| climateImpact |
regional climate cooling
ⓘ
stratospheric sulfate aerosol injection ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| elevation |
approximately 1530 meters
ⓘ
approximately 5020 feet ⓘ |
| eruptionFrequency | multiple historical eruptions in the 19th and 20th centuries ⓘ |
| eruptionProduct |
andesitic tephra
ⓘ
basaltic lava ⓘ volcanic ash ⓘ |
| eruptionStyle |
explosive
ⓘ
phreatomagmatic ⓘ strombolian ⓘ |
| geologicalAge | Quaternary ⓘ |
| hasCaldera | Okmok Caldera NERFINISHED ⓘ |
| hasCalderaFloorElevation | approximately 400 meters above sea level ⓘ |
| hasCrater | multiple post-caldera cones and craters ⓘ |
| hasFeature |
lava flows filling parts of the caldera floor
ⓘ
scoria cones ⓘ tuff cones ⓘ |
| hazardType |
ashfall
ⓘ
lahars ⓘ pyroclastic flows ⓘ volcanic gas emissions ⓘ |
| includedIn | Global Volcanism Program database NERFINISHED ⓘ |
| isActive | true ⓘ |
| islandVolcano | true ⓘ |
| lastEruption | 2008 ⓘ |
| locatedIn |
Alaska
ⓘ
Aleutian Islands NERFINISHED ⓘ Aleutians West Census Area NERFINISHED ⓘ North Pacific Ocean NERFINISHED ⓘ Umnak Island NERFINISHED ⓘ |
| monitoredBy |
Alaska Volcano Observatory
NERFINISHED
ⓘ
United States Geological Survey NERFINISHED ⓘ |
| mountainRange | Aleutian Range NERFINISHED ⓘ |
| nearbySettlement | Nikolski, Alaska NERFINISHED ⓘ |
| notableEruption |
2008 Okmok eruption
NERFINISHED
ⓘ
43 BCE Okmok caldera-forming eruption ⓘ |
| partOf |
Alaska Peninsula and Aleutian volcanic arc
NERFINISHED
ⓘ
Aleutian Arc NERFINISHED ⓘ |
| tectonicSetting | subduction of the Pacific Plate beneath the North American Plate ⓘ |
| volcanicExplosivityIndex | up to VEI 6 in prehistoric eruptions ⓘ |
| volcanoNumber | 311240 ⓘ |
| volcanoType | shield volcano with summit caldera ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.