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A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. When present, a plug can cause an extreme build-up of high gas pressure if rising volatile -charged magma is trapped beneath it, and this can sometimes lead to an explosive eruption.
A volcanic fissure and lava channel with lava fountain Channel of lava erupted during a fissure eruption of Kīlauea volcano, Hawaii, 2007 Eruption fissure with spatter cones, Holuhraun, Iceland, 2014 Mauna Loa with different lava flows and fissure vent A volcanic fissure eruption on Fagradalsfjall, Iceland, 2021 Crater row of Laki Eldhraun, a lava field produced by the Laki craters Cinder ...
The volcanic materials form a vertical column or plume that may rise many kilometers into the air above the vent of the volcano. In the most explosive eruptions, the eruption column may rise over 40 km (25 mi), penetrating the stratosphere. Stratospheric injection of aerosols by volcanoes is a major cause of short-term climate change.
Cabezon Peak is the solidified core of a volcano that erupted 2.658 ± 0.032 million years ago, based on argon-argon dating. The eruption at this volcano likely began with lava fountains from the vent, which built up a scoria cone. Lava later ponded in the interior of the cone, solidifying into a massive plug.
When felsic domes form, they are emplaced within and on top of the conduit. [16] If a dome forms and crystallizes enough early in an eruption, it acts as a plug on the system, [16] denying the main mechanism of degassing. If this happens, it is common that the eruption will change from effusive to explosive, due to pressure build up below the ...
Video of the volcano showed lava spewing into the air. According to the Icelandic Meteorological Office , the volcano shot lava about 50 meters (about 165 feet) high and came from a fissure that ...
Over 400 earthquakes have been detected beneath Washington's Mount St. Helens in recent months, though there are no signs of an imminent eruption.
Volcanoes known to have subglacial activity include: Mauna Kea in tropical Hawaii. There is evidence of past subglacial eruptive activity on the volcano in the form of a subglacial deposit on its summit. The eruptions originated about 10,000 years ago, during the last ice age, when the summit of Mauna Kea was covered in ice. [60]