Search results
Results from the WOW.Com Content Network
Typical shield volcanoes found in California and Oregon measure 3 to 4 mi (5 to 6 km) in diameter and 1,500 to 2,000 ft (500 to 600 m) in height, [6] while shield volcanoes in the central Mexican Michoacán–Guanajuato volcanic field average 340 m (1,100 ft) in height and 4,100 m (13,500 ft) in width, with an average slope angle of 9.4° and ...
This list of shield volcanoes includes active, dormant and extinct shield volcanoes. Shield volcanoes are one of the three types [ specify ] of volcanoes. They have a short cone shape, and have basaltic lava which means the lava has low viscosity (viscosity is a measure of the ability for a liquid to flow)
A "hotspot," Chadwick explains, is a point source of extra magma supply in one place. ... which means it's shaped like a shield rather than a steep-sided cone volcano. Its caldera at the top is a ...
The field contains at least 35 vents, arranged in a rough concentric pattern 50 kilometers (31 mi) across. The central part of the field is the most mafic, consisting of tholeiitic basalt shield volcanoes, with andesite vents further out and rhyodacite vents in the outer part of the field.
Peralkaline rhyolites erupt at relatively high temperatures of more than 1,200 °C (2,190 °F). They comprise bimodal shield volcanoes at hotspots and rifts (e.g. Rainbow Range, Ilgachuz Range and Level Mountain in British Columbia, Canada). [15] Eruptions of rhyolite lava are relatively rare compared to eruptions of less felsic lavas.
Selected geological features near the Skjaldbreiður shield volcano.(red outline). Light violet shading shows the current surface area of the Skjaldbreiður lava flows. Shading also shows: calderas, central volcanoes and fissure swarms, subglacial terrain above 1,100 m (3,600 ft), and seismically active areas. Clicking on the image enlarges to ...
It is a shield volcano with a diameter of 60–70 kilometres (37–43 mi) [15] or 60–80 kilometres (37–50 mi) [12] and an estimated volume of 2,500 cubic kilometres (600 cu mi). [17] The summit of Emi Koussi is formed by two overlapping calderas , which together form a [ 18 ] 15-by-11-kilometre (9.3 mi × 6.8 mi) wide [ 15 ] elliptical ...
This is because it is more favorable for the emulsifying agent to be at an interface so reducing the interfacial area requires expending energy to return the emulsifying agent to the bulk. Stability of the Macroemulsions are based on numerous environmental factors including temperature, pH, and the ionic strength of the solvent.