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Griggs ηφαίστειο

Τελευταία ανανενώση: 6 Δεκεμβρίου 2022 17:42 GMT -
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)

Διαδραστικός χάρτης
Typical eruption style: δεν έχει καθοριστεί
Griggs ηφαίστειο εκρήξεις: 1790 BC ± 40 years

Latest nearby earthquakes

ΏραMag. / ΒάθοςΑπόσταση/Τοποθεσία
Δευτέρα, 5 Δεκεμβρίου 2022 GMT (1 σεισμός)
5 Δεκ 2022 06:17 (GMT -9) (5 Δεκ 2022 15:17 GMT)
2.0

1.3 km
21 km (13 mi)
99 km νοτιοανατολικά από King Salmon, Bristol Bay, Αλάσκα, Ηνωμένες Πολιτείες
Παρασκευή, 2 Δεκεμβρίου 2022 GMT (1 σεισμός)
1 Δεκ 2022 20:47 (GMT -9) (2 Δεκ 2022 05:47 GMT)
3.0

51 km
21 km (13 mi)
94 km νοτιοανατολικά από King Salmon, Bristol Bay, Αλάσκα, Ηνωμένες Πολιτείες
Τετάρτη, 30 Νοεμβρίου 2022 GMT (2 σεισμοί)
29 Νοε 2022 21:02 (GMT -9) (30 Νοε 2022 06:02 GMT)
2.2
9.2 km (5.7 mi)
86 km βορειοδυτικά από Karluk, Kodiak Island, Αλάσκα, Ηνωμένες Πολιτείες
29 Νοε 2022 20:58 (GMT -9) (30 Νοε 2022 05:58 GMT)
2.5
10.7 km (6.6 mi)
85 km βορειοδυτικά από Karluk, Kodiak Island, Αλάσκα, Ηνωμένες Πολιτείες
Τετάρτη, 23 Νοεμβρίου 2022 GMT (1 σεισμός)
23 Νοε 2022 00:18 (GMT -9) (23 Νοε 2022 09:18 GMT)
2.5
12 km (7.5 mi)
98 km νοτιοανατολικά από King Salmon, Bristol Bay, Αλάσκα, Ηνωμένες Πολιτείες

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 | NASA FIRMS

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