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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, 16 Mar 2019
Sat, 16 Mar 12:32 UTCM 2.0 / 13.1 km26 km74km NNW of Larsen Bay, Alaska (USA)
Fri, 15 Mar 2019
Fri, 15 Mar 13:36 UTCM 2.3 / 9.6 km27 km73km NNW of Larsen Bay, Alaska (USA)
Thu, 7 Mar 2019
Thu, 7 Mar 22:11 UTCM 5.0 / 149 km36 km5.0 ALASKA PENINSULA (USA)
Sat, 2 Mar 2019
Sat, 2 Mar 01:45 UTCM 1.77 km89km SE of King Salmon, Alaska (USA)
Fri, 1 Mar 2019
Fri, 1 Mar 00:40 UTCM 2.2 / 2.1 km9 km106km NNW of Larsen Bay, Alaska (USA)
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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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