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Because dacite is the main type of lava erupted from Mount Garibaldi, lava flows are a low to moderate hazard. [3] Dacite is felsic [ d ] in composition, containing 62–69% silica content. [ 71 ] [ 72 ] This high percentage in silica content increases the viscosity of dacitic melts relative to that of andesite or basalt , generally resulting ...
The resulting deposits formed a fan-like pattern of overlapping sheets, tongues, and lobes. At least 17 separate pyroclastic flows occurred during the May 18 eruption, and their aggregate volume was about 0.05 cu mi (0.21 km 3). [9] The flow deposits were still at about 570 to 790 °F (300 to 420 °C) two weeks after they erupted. [9]
As a result of this fluidity, the peralkaline felsic lava flows were able to form small-scale folds and 1-to-2-metre-diameter (3.3-to-6.6-foot) lava tubes. The liquidus temperatures of these flows were in excess of 1,200 degrees Celsius (2,190 degrees Fahrenheit) with viscosities as low as 100,000 poise .
Time lapse video and photos of the March 27, 2009, eruption, taken from Ninilchik Archived June 4, 2009, at the Wayback Machine BBC page with footage and links to other pages on the volcano Large-format photo essay of the Mount Redoubt eruption from "The Big Picture" blog on Boston.com.
The main summit of the volcano is a lava dome called Pico Laco, which is variously reported to be 5,325 metres (17,470 ft) or 5,472 metres (17,953 ft) high. The edifice has been affected by glaciation, and some reports indicate that it is still fumarolically active. The volcano is known for its magnetite-containing lava flows of enigmatic origin.
The shape of effusive lava flows is governed by the type of lava (i.e. composition), rate and duration of eruption, and topography of the surrounding landscape. [ 3 ] For an effusive eruption to occur, magma must be permeable enough to allow the expulsion of gas bubbles contained within it.
A view of Etna volcano during strong ash and lava spewing in Catania, Italy on July 5, 2024. ... t is dangerous to approach the crater area even if there is no eruptive activity as sudden ...
Cinder cones, maars and accompanying lava flows also occur around Mount Hasan, they are part of a basaltic volcano family [27] that forms parasitic vents. [23] These include the Yıpraktepe cone/maar [28] and a lava flow field at Karataş which covers an area of 60 square kilometres (23 sq mi) and was produced by fissure vents. [29]