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  2. Magma chamber - Wikipedia

    en.wikipedia.org/wiki/Magma_chamber

    A magma chamber is a large pool of liquid rock beneath the surface of the Earth. The molten rock, or magma, in such a chamber is less dense than the surrounding country rock, which produces buoyant forces on the magma that tend to drive it upwards. [1] If the magma finds a path to the surface, then the result will be a volcanic eruption ...

  3. Plinian eruption - Wikipedia

    en.wikipedia.org/wiki/Plinian_eruption

    Plinian eruption. Plinian eruption: 1: ash plume; 2: magma conduit; 3: volcanic ash fall; 4: layers of lava and ash; 5: stratum; 6: magma chamber. 1822 artist's impression of the eruption of Mount Vesuvius in 79, depicting what the AD 79 eruption may have looked like, by the English geologist George Julius Poulett Scrope.

  4. Types of volcanic eruptions - Wikipedia

    en.wikipedia.org/wiki/Types_of_volcanic_eruptions

    Magma chamber) Phreatic eruptions (or steam-blast eruptions) are a type of eruption driven by the expansion of steam. When cold ground or surface water come into contact with hot rock or magma it superheats and explodes, fracturing the surrounding rock [63] and thrusting out a mixture of steam, water, ash, volcanic bombs, and volcanic blocks. [64]

  5. Volcano tectonic earthquake - Wikipedia

    en.wikipedia.org/wiki/Volcano_tectonic_earthquake

    A volcano tectonic earthquake or volcano earthquake is caused by the movement of magma beneath the surface of the Earth. [1] The movement results in pressure changes where the rock around the magma has a change in stress. At some point, this stress can cause the rock to break or move. This seismic activity is used by scientists to monitor ...

  6. Geothermal activity - Wikipedia

    en.wikipedia.org/wiki/Geothermal_activity

    Geothermal activity is a group of natural heat transfer processes, occurring on Earth's surface, caused by the presence of excess heat in the subsurface of the affected area, usually caused by the presence of an igneous intrusion underground. [1] Geothermal activity can manifest itself in a variety of different phenomena, including, among ...

  7. Phreatic eruption - Wikipedia

    en.wikipedia.org/wiki/Phreatic_eruption

    Phreatic eruption at the summit of Mount St. Helens, Washington, in the spring of 1980. A phreatic eruption, also called a phreatic explosion, ultravulcanian eruption or steam-blast eruption, [1] occurs when magma heats ground water or surface water. The extreme temperature of the magma (anywhere from 500 to 1,170 °C (930 to 2,100 °F)) causes ...

  8. Christmas Mountains caldera complex - Wikipedia

    en.wikipedia.org/wiki/Christmas_Mountains...

    Christmas Mountains caldera complex. Coordinates: 29.4304°N 103.4358°W. The Christmas Mountains caldera complex is a caldera complex located in the Christmas Mountains in Big Bend National Park in western Texas. [1] It is the oldest such complex preserved in Texas [2] and is the type example of a laccocaldera [1] (eruptive laccolith [3]).

  9. Cinder cone - Wikipedia

    en.wikipedia.org/wiki/Cinder_cone

    Cinder cone. A cinder cone (or scoria cone[1]) is a steep conical hill of loose pyroclastic fragments, such as volcanic clinkers, volcanic ash, or scoria that has been built around a volcanic vent. [2][3] The pyroclastic fragments are formed by explosive eruptions or lava fountains from a single, typically cylindrical, vent.

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