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Griggs vulcano

Aggiornato: 3 feb. 2023 07:39 GMT -
Stratovolcano 2317 m / 7,602 ft
United States, Alaska Peninsula, 58.35°N / -155.09°W
Stato attuale: normal or dormant (1 di 5)

Mostra la mappa interattiva
Stile eruttivo tipico: non specificato
Eruzioni del vulcano Griggs: 1790 BC ± 40 years

Latest nearby earthquakes

Data / oraMag. / Prof.Distanza/Ubicazione
venerdì, 27 gennaio 2023 GMT (1 sismo)
26 gen 2023 20:26 (GMT -9) (27 gen 2023 05:26 GMT)
2.3

3.1 km
15 km (9.3 mi)
99 km a sud-est da King Salmon, Borough di Bristol Bay, Alaska, Stati Uniti
giovedì, 26 gennaio 2023 GMT (1 sismo)
26 gen 2023 09:53 (GMT -9) (26 gen 2023 18:53 GMT)
2.7

37 km
13 km (8.1 mi)
100 km a sud-est da King Salmon, Borough di Bristol Bay, Alaska, Stati Uniti
lunedì, 23 gennaio 2023 GMT (1 sismo)
23 gen 2023 10:12 (GMT -9) (23 gen 2023 19:12 GMT)
1.8
26 km (16 mi)
93 km a sud-est da King Salmon, Borough di Bristol Bay, Alaska, Stati Uniti
domenica, 22 gennaio 2023 GMT (1 sismo)
21 gen 2023 22:13 (GMT -9) (22 gen 2023 07:13 GMT)
1.5

0.6 km
26 km (16 mi)
87 Km NW of Karluk, Alaska
sabato, 21 gennaio 2023 GMT (1 sismo)
21 gen 2023 05:40 (GMT -9) (21 gen 2023 14:40 GMT)
2.5
12 km (7.5 mi)
99 km a sud-est da King Salmon, Borough di Bristol Bay, Alaska, Stati Uniti

Sfondo

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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