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News
mar, 15 set 2020, 19:34
Katmai volcano on 11 September (image: AVO)
The Alaska Volcano Observatory (AVO) reported that strong southerly winds in the vicinity of Katmai and the Valley of Ten Thousand Smokes have picked up loose volcanic ash erupted during the 1912 Novarupta-Katmai eruption and carried it to the north today. The resuspended ash cloud was observed by a local pilot flying in the vicinity of Brooks Camp and Naknek Lake on the Alaska Peninsula at 18:25 local time and is ongoing. The resuspended ash cloud height is unknown but the National Weather Service suggests that it could reached up to 4,000 ft (1,219 m) altitude. ... leggere tutti

Katmai vulcano

Stratovulcano con caldera centrale 2047 m / 6716 ft
Alaska Peninsula, USA, 58.28°N / -154.95°W
Stato attuale: normal or dormant (1 di 5)
Last update: 15 Sep 2020 (strong winds have picked up volcanic ash)

A large stratovolcano in Alaska, near the Novarupta vent, that erupted in 1912 with the largest volcanic eruption in the 20th century, 10 times the size of the 1980 eruption of Mt. St. Helens.

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Stile eruttivo tipico: Esplosivo
Eruzioni del vulcano Katmai: 1912 (Plinian eruption: the largest in the 20th century!)

Latest nearby earthquakes

Data / oraMag. / ProfonditàDistanzaUbicazione
Tue, 13 Apr 2021 (GMT) (5 Terremoti)
13 Apr 2021 21:25:49 GMT
2.1

47 km - Di più
76 km47 Km W of Karluk, Alaska, USA
13 Apr 2021 21:03:24 GMT
0.5

4 km - Di più
12 km86 Km NNW of Karluk, Alaska, USA
13 Apr 2021 16:54:15 GMT
1.5

55 km - Di più
66 km40 Km N of Larsen Bay, Alaska, USA
13 Apr 2021 14:44:57 GMT
0.9

43 km - Di più
31 km59 Km NW of Karluk, Alaska, USA
13 Apr 2021 07:26:49 GMT
2.2

0.1 km - Di più
34 km96 Km S of Kokhanok, Alaska, USA

Sfondo

Katmai volcano is a large stratovolcano about 10 km in diameter with a central lake-filled caldera whose rim is about 4.2 by 2.5 km in area. The caldera rim has a maximum elevation of 2047 m and in 1975 the lake surface was at an elevation of about 1236 m. The estimated elevation of the caldera floor is about 995 m.
The volcano is one of five stratovolcanoes near the Novarupta dome, which was the source of the large Plinian eruption in 1912. The eruption produced voluminous pyroclastic flows and counts as the largest eruption in the 20th century.
Much of the volcano is mantled by snow and ice and several valley glaciers radiate out from the flanks and three glaciers originating from the upper caldera walls descend into the crater to the lake
Katmai volcano is built on the sedimentary rocks of the Naknek Formation of Late Jurassic age, which are exposed just west of the caldera rim at an elevation of about 1520 m, as well as north and southeast of the crater.
(from: Alaska Volcano Observatory's website).

The June 1912 eruption of Novarupta Volcano altered the Katmai area dramatically. Severe earthquakes rocked the area for a week before Novarupta exploded with cataclysmic force. Enormous quantities of hot, glowing pumice and ash were ejected from Novarupta and nearby fissures. This material flowed over the terrain, destroying all life in its path. Trees up slope were snapped off and carbonized by the blasts of hot wind and gas. For several days ash, pumice, and gas were ejected and a haze darkened the sky over most of the Northern Hemisphere. When it was over, more than 40 square miles of lush green land lay buried beneath volcanic deposits as much as 700 feet deep. At nearby Kodiak, for two days a person could not see a lantern held at arm's length. Acid rain caused clothes to disintegrate on clotheslines in distant Vancouver, Canada. The eruption was ten times more forceful than the 1980 eruption of Mount St. Helens. In the valleys of Knife Creek and the Ukak River, innumerable small holes and cracks developed in the volcanic ash deposits, permitting gas and steam from the heated groundwater to escape. It was an apparently unnamed valley whehn the 20th century's most dramatic volcanic episode took place. Robert Griggs, exploring the volcano's aftermath for the National Geographic Society in 1916, stared awestruck off Katmai Pass across the valley's roaring landscape riddled by thousands of steam vents. The Valley of Ten Thousand Smokes, Griggs named it.
(from: U. S. National Park Service Website, Geology Fieldnotes - Katmai National Park and Preserve, Alaska, April 2000, posted on CVO's website at: vulcan.wr.usgs.gov/Volcanoes/Alaska/description_1912_eruption_novarupta.html)


See also: Sentinel hub | Landsat 8
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