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Griggs volcano

Stratovolcano 2317 m / 7,602 ft
United States, Alaska Peninsula, 58.35°N / -155.09°W
Current status: normal or dormant (1 out of 5) | Reports
Griggs volcano books
Typical eruption style: unspecified
Griggs volcano eruptions: 1790 BC ± 40 years
TimeMag. / DepthDistanceLocation
Sat, 13 Oct
Sat, 13 Oct 15:35 UTCM 1.7 / 59 km27 km- 74km NW of Larsen Bay, Alaska
Sat, 13 Oct 00:47 UTCM 1.43 km- 92km SE of King Salmon, Alaska
Fri, 12 Oct
Fri, 12 Oct 19:42 UTCM 0.4 / 1 km2 km- 95km SE of King Salmon, Alaska
Fri, 12 Oct 02:03 UTCM 1.3 / 4 km1 km- 103km ESE of King Salmon, Alaska
Fri, 12 Oct 01:21 UTCM 0.1 / 6.4 km2 km- 101km ESE of King Salmon, Alaska
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Background:

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.
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Smithsonian / GVP volcano information


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