File:Dendi Caldera.jpg

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Descriziun Dendi Caldera, Ethiopia is featured in this image photographed by an Expedition 16 crew member on the International Space Station. The Dendi Caldera is located on the Ethiopian Plateau, approximately 86 kilometers to the southwest of Addis Ababa. A caldera is a geological feature formed by the near-total eruption of magma from beneath a volcano, leading to collapse of the volcanic structure into the now-empty magma chamber. This collapse typically leaves a crater or depression where the volcano stood, and later volcanic activity can fill the caldera with younger lavas, ash, pyroclastic rocks, and sediments. While much of the volcanic rock in the area is comprised of basalt erupted as part of the opening of the East African Rift, more silica-rich rock types (characterized by minerals such as quartz and feldspar) are also present. According to scientists, the approximately 4 kilometers wide Dendi Caldera includes some of this silica-rich volcanic rock -- the rim of the caldera, visible in this view, is comprised mainly of poorly-consolidated ash erupted during the Tertiary Period (approximately 65 -- 2 million years ago). A notable feature of the Dendi Caldera is the presence of two shallow lakes formed within the central depression (center). This image also highlights a radial drainage pattern surrounding the remnants of the Dendi volcanic cone. Such patterns typically form around volcanoes, as rainfall has equal potential to move downslope on all sides of the cone and incise channels. No historical volcanic eruptions of Dendi are recorded, however the Wonchi Caldera 13 kilometers to the southwest (not shown) may have been active as "recently" as A.D. 550, say NASA scientists.
Data
Funtana http://spaceflight.nasa.gov/gallery/images/station/crew-16/html/iss016e019239.html
Autur NASA
Luogo dello scatto8° 50′ 23,84″ N, 38° 00′ 49,41″ E Kartographer map based on OpenStreetMap.Posizione di questa e altre immagini su: OpenStreetMapinfo


Questa immagine o filmato è stato catalogato da uno dei centri della
National Aeronautics and Space Administration
 (NASA) degli Stati Uniti d'Americacon il Photo ID: ISS016-E-019239.

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Public domain Questo file è nel pubblico dominio perché creato dalla NASA. La politica sul copyright della NASA afferma che «il materiale della NASA non è protetto da copyright a meno che non sia specificato altrimenti». (NASA copyright policy e JPL Image Use Policy).
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raffigura italiano

data di fondazione o creazione italiano

29 dez 2007

coordinate del punto di vista italiano

8°50'23.837646532676"N, 38°0'49.411010742158"E

tipo di file italiano

image/jpeg

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atuel15:41, 5 aur 2008Miniatura de la version de la 15:41, 5 aur 2008639 × 423 (122 KB)TheDJ{{Information |Description=Dendi Caldera, Ethiopia is featured in this image photographed by an Expedition 16 crew member on the International Space Station. The Dendi Caldera is located on the Ethiopian Plateau, approximately 86 kilometers to the southwe

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