Volcano Teide, Spain (NASA, International Space Station Science, 15/07/09)
Volcano Teide in the Canary Islands of Spain appears in this image photographed by a crew member Expedition 20 on the International Space Station. This photograph features two stratovolcanoes detailed – Pico del Teide and Pico Viejo – located on the island of Tenerife, part of the Canary Islands of Spain. Stratovolcanoes are steep-sided, typically conical structures formed by lavas intercalated and fragmented rock material from explosive eruptions. Pico de Teide has a relatively sharp peak, while an explosion crater is the summit of Pico Viejo. The two stratovolcanoes formed within an even larger volcanic structure known as the Las Cañadas caldera – a large collapse depression usually forms when a major eruption completely empties the underlying magma chamber of a volcano. The last eruption occurred in 1909, Teide. NASA scientists say winding dikes that mark the different flows of lava flow.
Scientists consider the flow as dykes perhaps the most striking volcanic features visible in the image. Flow levees form when the outer edges of a lava flow channeled cool and harden while still molten interior continues to flow downhill – radiate numerous examples of the peaks of both Pico Teide and Pico Viejo. Brown as overlapping lava flows and domes are visible east-southeast of the volcano Teide. Increased seismicity, emissions of carbon dioxide, and fumarolic activity within the Las Cañadas caldera and along the flanks of the volcano’s northwest were observed in 2004. Volcano monitoring to detect renewed activity in the image curso.