Griggs

Photo of this volcano
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  • United States
  • Alaska
  • Stratovolcano
  • 1790 BCE
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 58.354°N
  • 155.092°W

  • 2317 m
    7600 ft

  • 312190
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Griggs.

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

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

The summit of Mount Griggs towers above Knife Creek on the NE side of the Valley of Ten Thousand Smokes. The volcano is uniquely offset west of the NE-trending alignment of volcanoes in the Katmai area. The broad, 2317-m-high stratovolcano, formerly known as Knife Peak, consists of a late-Pleistocene volcano with glacial valleys on the north that was truncated on its SW side by an early Holocene edifice collapse. A Holocene volcano was subsequently constructed within the 1.5-km-wide scarp left by the emplacement of a large SW-flank debris avalanche. Nested cones with three concentric craters mostly fill the scarp, and thick, blocky lava flows blanket the SW flanks of the volcano below the collapse scarp. In contrast to the more silicic centers of the Katmai area along the crest of the range, lava flows from Griggs are dominantly andesitic in composition, and dacitic lava flows are uncommon. No historical eruptions have occurred from Griggs, but noisy fumarolic jets near the summit can be heard from the valley floor, 1750 m below.

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1790 BCE ± 40 years Unknown Confirmed   Radiocarbon (corrected)

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.



Synonyms
Knife Peak
Griggs volcano, 2265-m-high, is the highest of a group of volcanoes in the Katmai area. It lies 10 km behind the volcanic arc defined by other Katmai group volcanoes. Griggs is only slightly dissected and is largely of Holocene age. Although no historical eruptions have been reported from Griggs, vigorously active fumarolic fields persist in a summit crater and along the upper SW flank. The slopes of Griggs are heavily mantled by fallout from the 1912 Novarupta eruption in this 1990 view from the SW.

Photo by Game McGimsey, 1990 (U.S. Geological Survey, Alaska Volcano Observatory).
Mount Griggs, seen here from the west rim of Katmai caldera, is a 2265-m stratovolcano that lies west of a NE-trending arc of volcanoes cutting across Katmai National Park. No historical eruptions are known from this largely Holocene volcano. Noisy fumarolic jets at the summit of Griggs can be heard from long distances.

Photo by Game McGimsey (Alaska Volcano Observatory, U.S. Geological Survey).
Geologists walk toward 2265-m-high Griggs volcano from the base of Knife Creek Glacier to its south. The relatively unmodified slopes of the volcano reflect its largely Holocene age. Although no historical eruptions have been reported from Griggs, vigorously active fumarolic fields persist in a summit crater and along the upper SW flank. Noisy fumarole jets can be heard from the valley floor. The slopes of Griggs and the surface of Knife Creek Glacier are heavily mantled by gray fallout from the 1912 Novarupta eruption.

Photo by Game McGimsey (Alaska Volcano Observatory, U.S. Geological Survey).

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

Fierstein J, 2007. Explosive eruptive record in the Katmai region, Alaska Peninsula: an overview. Bull Volc, 69: 469-509.

Henning R A, Rosenthal C H, Olds B, Reading E (eds), 1976. Alaska's volcanoes, northern link in the ring of fire. Alaska Geog, 4: 1-88.

Hildreth W, 1987. New perspectives on the eruption of 1912 in the Valley of Ten Tousand Smokes, Katmai National Park, Alaska. Bull Volc, 49: 680-693.

Hildreth W, Fierstein J, 2000. Katmai volcanic cluster and the great eruption of 1912. Geol Soc Amer Bull, 112: 1594-1620.

Hildreth W, Fierstein J, Lanphere M A, Siems D F, 2002. Mount Griggs: a compositionally distinctive Quaternary stratovolcano behind the main volcanic line in Katmai National Park. In: Wilson R H, Galloway J P (eds), Geologic Studies in Alaska by the U. S. Geological Survey, 2000 {U S Geol Surv Prof Pap}, 1662: 87-112.

Hildreth W, Lanphere M A, Fierstein J, 2003b. Geochronology and eruptive history of the Katmai volcanic cluster, Alaska Peninsula. Earth Planet Sci Lett, 214: 93-114.

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Motyka R J, Liss S A, Nye C J, Moorman M A, 1993. Geothermal resources of the Aleutian arc. Alaska Div Geol Geophys Surv, Prof Rpt, no 114, 17 p and 4 map sheets.

Wood C A, Kienle J (eds), 1990. Volcanoes of North America. Cambridge, England: Cambridge Univ Press, 354 p.

Volcano Types

Stratovolcano
Pyroclastic cone(s)

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Major
Andesite / Basaltic Andesite
Minor
Dacite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
0
0
0
654

Affiliated Databases

Large Eruptions of Griggs Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.