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A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. [1] Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and periodic intervals of explosive eruptions and effusive eruptions, although some have collapsed summit ...
Lassen Peak lies near the southern end of the Cascade Volcanic Arc, at the western edge of the Basin and Range Province. Like other Cascade volcanoes, it was fed by magma chambers produced by the subduction of the oceanic Juan de Fuca tectonic plate under the western edge of the continental North American tectonic plate.
Mount Mazama (Tum-sum-ne in the Native American language Klamath [5]) is a complex volcano in the western U.S. state of Oregon, in a segment of the Cascade Volcanic Arc and Cascade Range. The volcano is in Klamath County, in the southern Cascades, 60 miles (97 km) north of the Oregon– California border and. Its collapse, due to the eruption ...
Three survivors were found near the volcano’s crater, described as being in a weak condition and having suffered burns. ... where most likely the dike is fed by magma accumulating beneath ...
Markagunt Plateau. Markagunt Plateau is a volcanic field in southern Utah, United States. Formed in a region of older volcanics, it consists of several cinder cones and associated lava flows. Some of the lava flows feature lava tubes such as Mammoth Cave, while others have formed lava dams and lakes like Navajo Lake.
The biotite-bearing rhyolite composition is like that found within the Maroa Caldera adjacent to the Taupō Volcano. [ 11 ] These initial stages were from magma at relatively low overpressure and if stored and matured in a shallow magma chamber had a temperature of about 780 ± 20 °C, [ 11 ] with between a week to two weeks ascent of magma ...
The Alitar volcano is considered to be of Plio-Pleistocene age. [33] The eruptive episode that formed these centres is thus more recent than the Purico ignimbrite and may have been triggered by mafic magma being injected into the Purico system. It is also much smaller, with volumes ranging 0.36–4 cubic kilometres (0.086–0.960 cu mi).
The Sand Mountain Field is part of the Cascade volcanic arc and is located at the western edge of the High Cascades segment [ 1] of the central Oregon Cascades, [ 2] near the upper McKenzie River watershed [ 1] in Oregon, in the United States. [ 3] It encompasses an area of 29 square miles (76 km 2) [ 4] and has a maximum elevation of 5,463 ...