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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)

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Typical eruption style: sin especificar
Erupciones del volcán Griggs: 1790 BC ± 40 years

Latest nearby earthquakes

Fecha / HoraRevista / ProfundidadDistanciaUbicación
Tue, 20 Apr 2021 (GMT) (3 temblores)
20 Apr 2021 17:49:56 GMT
1.4

6 km - Más
94 km90 Km NNW of Aleneva, Alaska, USA
20 Apr 2021 12:56:57 GMT
1.7

5.3 km - Más
20 km87 Km ESE of King Salmon, Alaska, USA
20 Apr 2021 05:58:29 GMT
2.3

122 km - Más
50 km49 Km SE of King Salmon, Alaska, USA
Sun, 18 Apr 2021 (GMT) (2 temblores)
18 Apr 2021 11:15:44 GMT
1.7

131 km - Más
105 km77 Km ESE of Egegik, Alaska, USA
18 Apr 2021 02:29:50 GMT
1.2

89 km - Más
127 km66 Km SE of Pope-Vannoy Landing, Alaska, USA

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


See also: Sentinel hub | Landsat 8
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