Katmai

Photo of this volcano
  • United States
  • Alaska
  • Stratovolcano
  • 1912 CE
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 58.28°N
  • 154.963°W

  • 2047 m
    6714 ft

  • 312170
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Katmai.

The Global Volcanism Program has no Weekly Reports available for Katmai.

The Global Volcanism Program has no Bulletin Reports available for Katmai.

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Eruptive History


There is data available for 6 Holocene eruptive periods.


Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
[ 1931 May 8 ] [ 1931 Jul ] Discredited    
[ 1929 Dec ] [ Unknown ] Discredited    
[ 1921 Nov 27 ] [ Unknown ] Discredited    
[ 1920 Mar 9 ] [ Unknown ] Discredited    
[ 1914 Jul ] [ Unknown ] Discredited    
1912 Jun 6 1912 Jul 21 (in or after) Confirmed 3 Historical Observations

Deformation History


There is no Deformation History data available for Katmai.

Emission History


There is no Emissions History data available for Katmai.

Photo Gallery


Katmai caldera, a collapse feature formed during the catastrophic eruption of the nearby Novarupta vent in June 1912 is seen here in an aerial view from the NE. The steep-walled, 1.5-km-wide Katmai caldera truncates a formerly 2290-m-high cluster of overlapping stratovolcanoes. The caldera is partially filled by a blue-green lake that is about 250 m deep and rising. Beyond the caldera are the multiple peaks of Trident volcano; Mageik volcano is the snow-and-ice-covered cone on the skyline.

Photo by Chris Nye, 1991 (Alaska Division of Geological and Geophysical Surveys, Alaska Volcano Observatory).
See title for photo information.
Katmai caldera, seen here from its west rim, is a 3 x 4.5 km wide caldera that formed in 1912. Little if any eruptive activity took place at Katmai itself, which prior to collapse was a complex of 4 small overlapping stratovolcanoes. Hydraulic draining of magma away from Katmai to Novarupta volcano (10 km to the west) during the catastrophic 1912 eruption caused the collapse of the unsupported summit(s) of Katmai. The 250-m-deep caldera lake covers a small lava dome and tuff ring that were erupted on the floor of the caldera.

Photo by Game McGimsey, 1990 (Alaska Volcano Observatory, U.S. Geological Survey).
See title for photo information.

Smithsonian Sample Collections Database


The following 76 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections, and may be availble for research (contact the Rock and Ore Collections Manager). Catalog number links will open a window with more information.

Catalog Number Sample Description Lava Source Collection Date
NMNH 116509-1 Glass -- 18 Aug 1923
NMNH 116509-10 Andesite -- 3 Sep 1923
NMNH 116509-11 Glass -- 10 Oct 1923
NMNH 116509-12 Basalt -- --
NMNH 116509-13 Glass -- 1 Jul 1923
NMNH 116509-14 Basalt -- 27 Jul 1923
NMNH 116509-15 Dike Rock -- 8 Jun 1923
NMNH 116509-16 Obsidian -- 10 Jul 1923
NMNH 116509-17 Rhyolite -- 5 Jul 1923
NMNH 116509-18 Tuff -- --
NMNH 116509-19 Basalt -- 10 Oct 1923
NMNH 116509-2 Syenite -- 6 Jul 1923
NMNH 116509-20 Obsidian -- 10 Jul 1923
NMNH 116509-21 Granite -- 6 Sep 1923
NMNH 116509-22 Lava -- 14 Jul 1923
NMNH 116509-23 Quartz Porphyry -- 4 Aug 1923
NMNH 116509-24 Glass -- 2 Aug 1923
NMNH 116509-25 Dacite -- 10 Oct 1923
NMNH 116509-26 Rhyolite -- 1 Jul 1923
NMNH 116509-3 Pumice -- 19 Jul 1923
NMNH 116509-4 Glass -- 11 Jul 1923
NMNH 116509-5 Quartz Porphyry -- 20 Aug 1923
NMNH 116509-6 Andesite -- 10 Aug 1923
NMNH 116509-7 Trachyte -- 26 Jul 1923
NMNH 116509-8 Tuff -- 2 Aug 1923
NMNH 116509-9 Pumice -- 13 Aug 1923
NMNH 116550-1 Pumice -- 25 Aug 1923
NMNH 116550-10 Granite -- --
NMNH 116550-2 Pumice -- 25 Aug 1923
NMNH 116550-3 Pumice -- 25 Aug 1923
NMNH 116550-4 Tuffaceous Sand -- 8 Jul 1923
NMNH 116550-5 Tuffaceous Sand -- 30 Apr 1935
NMNH 116550-6 Pumice -- --
NMNH 116550-7 Pumice -- --
NMNH 116550-8 Pumice -- --
NMNH 116550-9 Pumice -- --
NMNH 116660-4 Dacitic Pumice -- --
NMNH 117259-1 Fumarole Deposit -- 30 Jun 1919
NMNH 117259-10 Fumarole Deposit -- 4 Jul 1919
NMNH 117259-11 Fumarole Deposit -- 4 Jul 1919
NMNH 117259-12 Fumarole Deposit -- 6 Jul 1919
NMNH 117259-13 Fumarole Deposit -- 4 Jul 1919
NMNH 117259-14 Fumarole Deposit -- 5 Jul 1919
NMNH 117259-15 Fumarole Deposit -- 5 Jul 1919
NMNH 117259-16 Fumarole Deposit -- --
NMNH 117259-17 Fumarole Deposit -- 14 Aug 1919
NMNH 117259-18 Fumarole Deposit -- 14 Aug 1919
NMNH 117259-19 Fumarole Deposit -- 11 Aug 1919
NMNH 117259-2 Fumarole Deposit -- 15 Aug 1919
NMNH 117259-25 Fumarole Deposit -- --
NMNH 117259-26 Fumarole Deposit -- 9 Aug 1919
NMNH 117259-27 Fumarole Deposit -- 9 Aug 1919
NMNH 117259-28 Fumarole Deposit -- 9 Aug 1919
NMNH 117259-29 Fumarole Deposit -- 9 Aug 1919
NMNH 117259-3 Fumarole Deposit -- 12 Aug 1919
NMNH 117259-30 Fumarole Deposit -- 10 Aug 1919
NMNH 117259-31 Fumarole Deposit -- 8 Aug 1919
NMNH 117259-32 Fumarole Deposit -- 11 Aug 1919
NMNH 117259-33 Fumarole Deposit -- 11 Aug 1919
NMNH 117259-34 Fumarole Deposit -- 12 Aug 1919
NMNH 117259-35 Fumarole Deposit -- 12 Aug 1919
NMNH 117259-36 Fumarole Deposit -- 13 Aug 1919
NMNH 117259-37 Fumarole Deposit -- 15 Aug 1919
NMNH 117259-38 Fumarole Deposit -- 14 Aug 1919
NMNH 117259-39 Fumarole Deposit -- 14 Aug 1919
NMNH 117259-4 Fumarole Deposit -- 12 Aug 1919
NMNH 117259-40 Fumarole Deposit -- --
NMNH 117259-41 Fumarole Deposit -- 14 Aug 1919
NMNH 117259-42 Fumarole Deposit -- 14 Aug 1919
NMNH 117259-43 Fumarole Deposit -- 8 Jul 1919
NMNH 117259-44 Fumarole Deposit -- --
NMNH 117259-5 Fumarole Deposit -- 12 Aug 1919
NMNH 117259-6 Fumarole Deposit -- 26 Jul 1919
NMNH 117259-7 Fumarole Deposit -- 2 Jul 1919
NMNH 117259-8 Fumarole Deposit -- 4 Jul 1919
NMNH 117259-9 Fumarole Deposit -- 4 Jul 1919

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