File:Volcanic debris flow deposit (upper Holocene, May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 8 (37321528740).jpg
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Summario
DescriptionVolcanic debris flow deposit (upper Holocene, May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 8 (37321528740).jpg |
This is a volcanic deposit near Mt. Lassen (Lassen Peak), a prominent volcano and the key scenery in Lassen Volcanic National Park. Lassen Volcano is part of the Cascade Range, a north-south linear chain of active and potentially active volcanoes in America's Pacific Northwest. It extends from northern California to Oregon, Washington State, and into British Columbia, Canada. The Cascade Range formed as a result of tectonic subduction - the offshore Juan de Fuca Plate is diving below the North American Plate. The diving plate causes melting in the mantle. The melt rises and emerges at the surface at volcanic centers. Famous Cascade Range volcanoes include Mt. St. Helens, which had a large eruption in May 1980, Mt. Rainier near Seattle, Mt. Hood, which is the highest peak in Oregon, and Mt. Mazama, which destroyed itself 7,700 years ago in an enormous eruption that produced the modern-day Crater Lake Caldera (also a national park). Mt. Lassen is a large volcanic dome that developed by lava extruding along the northeastern flanks of a former Cascade Range feature called Brokeoff Volcano (also known as Tehama Volcano). Brokeoff Volcano is an andesitic-dacitic subduction zone stratovolcano (composite volcano). Stratovolcanoes usually have violent, explosive ash eruptions. They tend to erupt igneous materials of intermediate chemistry (between felsic and mafic). Brokeoff Volcano was active from about 4 million years ago, during the Pliocene, to about 400,000 years ago. Only the caldera exists today. Calderas are large holes or depressions left behind after a volcano destroys itself or collapses. The Brokeoff Caldera is an erosional and slow-collapse caldera that formed before about 350,000 years ago. The Mt. Lassen volcanic dome first started forming in the Late Pleistocene, at about 29 ka. It is principally composed of dacite lava, an extrusive igneous rock that is usually porphyritic-textured. Dacite is between andesite and rhyolite in silica content. Activity through time has ranged from dacite lava extrusion to explosive ash eruptions. Mt. Lassen last experienced eruptive activity in the early 1900s (1914 to 1921). The boulders shown here are in a volcanic debris flow deposit from 19 and 22 May 1915, when Mt. Lassen last had a significant eruption. The deposit consists of fine sediments, cobbles, and boulders, some of which are quite large. Clasts in the flow deposit include pinkish-reddish porphyritic dacite and gray porphyritic dacite, both of which formed at 27 ka during the Late Pleistocene, early in Mt. Lassen's history. Another clast type in the deposit is black porphyritic dacite, which formed on 14 May 1915. Other clast types present include dacite pumice and banded andesite-dacite pumice, both of which formed on 22 May 1915. Locality: Devastated Area, Lassen Volcano National Park, northeastern California, USA |
Data | |
Origine | Volcanic debris flow deposit (upper Holocene, May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 8 |
Autor | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/37321528740 (archive). It was reviewed on 24 de februario 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
24 de februario 2018
Objectos representate in iste file
representa
Alcun valor sin elemento Wikidata
copyright status anglese
copyrighted anglese
inception anglese
14 julio 2010
captured with anglese
Nikon D70s anglese
source of file anglese
exposure time anglese
0,005 secunda
f-number anglese
8
focal length anglese
18 millimetro
ISO speed anglese
400
MIME type anglese
image/jpeg
photograph anglese
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Data/Hora | Miniatura | Dimensiones | Usator | Commento | |
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actual | 18:15, 24 februario 2018 | 3 008 × 2 000 (4,83 MB) | Methodood | Transferred from Flickr via #file_candidates |
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Metadatos
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Fabricante del camera | NIKON CORPORATION |
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Modello del camera | NIKON D70s |
Tempore de exposition | 1/200 sec (0,005) |
Numero F | f/8 |
Classification de velocitate ISO | 400 |
Data e hora del generation del datos | 15:29, 14 julio 2010 |
Longitude focal del lente | 18 mm |
Latitude | 3 008 px |
Altitude | 2 000 px |
Bits per componente |
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Composition de pixel | RGB |
Orientation | Normal |
Numero de componentes | 3 |
Resolution horizontal | 300 dpi |
Resolution vertical | 300 dpi |
Software usate | Adobe Photoshop Elements 13.0 (Macintosh) |
Data e hora de modification del file | 17:35, 8 octobre 2017 |
Positionamento Y e C | Co-situate |
Programma de exposition | Non definite |
Version de Exif | 2.21 |
Data e hora del digitalisation | 15:29, 14 julio 2010 |
Significato de cata componente |
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Modo de compression del imagine | 4 |
Velocitate del obturator in unitates APEX | 7,643856 |
Latitude del apertura in unitates APEX | 6 |
Correction de exposition | 0 |
Apertura maxime pro terra | 3,6 APEX (f/3,48) |
Modo de mesura | Patrono |
Fonte de lumine | Incognite |
Flash | Flash non ha fulgurate |
Fractiones de secundas DateTime | 90 |
Fractiones de secundas DateTimeOriginal | 90 |
Fractiones de secundas DateTimeDigitized | 90 |
Version supportate de Flashpix | 1 |
Spatio de colores | sRGB |
Methodo de sensor | Sensor de area de colores a singule chip |
Origine del file | Camera photographic digital |
Typo de scena | Un imagine directemente photographiate |
Processamento de imagines personalisate | Processo normal |
Modo de exposition | Exposition automatic |
Balancia de blanc | Balancia de blanc automatic |
Ration de zoom digital | 1 |
Longitude focal in film de 35 mm | 27 mm |
Typo de captura de scena | Standard |
Controlo de scena | Nulle |
Contrasto | Normal |
Saturation | Normal |
Nitiditate | Normal |
Intervallo de distantia del subjecto | Incognite |
Numero de serie del camera | 200638ad |
Objectivo usate | 18.0-200.0 mm f/3.5-5.6 |
Data del ultime modification del metadatos | 13:35, 8 octobre 2017 |
ID unic del documento original | 10BBEC5BDCE99AF33E0EF1C7E102ADA1 |