Knowra Supervolcano Supervolcano A volcano capable of producing an eruption that ejects more than 1,000 cubic kilometers of material. Such eruptions can leave vast calderas and reshape regional landscapes.
Caldera : A large volcanic depression formed when the ground collapses after magma drains from an underlying reservoir. Collapse of the roof above an emptied magma system can create the vast basin left by a supereruption.
Toba supereruption : A massive volcanic eruption in Sumatra about 74,000 years ago that produced the Toba caldera. Toba is a canonical supereruption whose possible effects on human populations remain debated.
Volcano monitoring : The observation of volcanic activity through seismic, geodetic, gas, thermal, and other measurements. Monitoring tracks changes in systems such as Yellowstone without implying that an eruption is imminent.
VEI 8 eruption : An explosive eruption assigned the highest category on the Volcanic Explosivity Index, generally involving at least 1,000 cubic kilometers of erupted material. The eruption-size threshold defines the event; “supervolcano” describes the volcanic system capable of producing one.
Magma chamber : An underground region where molten rock accumulates within Earth's crust. The size, state, and recharge of this reservoir shape whether a supereruption can occur.
Yellowstone Caldera : A volcanic caldera in the northwestern United States formed by several large eruptions over the past 2.1 million years. Its eruption history makes Yellowstone a prominent example of an active supervolcanic system.
Volcanic hazard : A potentially harmful volcanic process or condition, including ashfall, lava flows, and volcanic gases. Supervolcanoes produce hazards across unusually broad areas and over long timescales.
Shield volcano : A broad volcano built mainly by repeated effusions of fluid basaltic lava. Its typical low-explosivity eruptions contrast with the rare, enormous explosive events associated with supervolcanoes.
Silicic magma : Magma rich in silica, typically viscous and capable of trapping volcanic gases. Its viscosity and gas content help generate the explosive eruptions associated with many supervolcanoes.
Oruanui eruption : A major eruption of New Zealand's Taupō Volcano about 25,500 years ago, producing the Taupō caldera. It is the most recent known eruption classified as a supereruption.
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