Everything about Rift Zone totally explained
A
rift zone is a feature of some
volcanoes, especially the
shield volcanoes of
Hawaii, in which a linear series of
fissures in the volcanic edifice allows
lava to be erupted from the volcano's flank instead of from its summit. For example, in the currently ongoing eruption of
Kilauea lava is emitted continuously from the
Puu Ōō vent located in Kilauea's East Rift Zone roughly 15 km east of Kilauea Crater. Rift zones tend to extend for tens of kilometers radially outward from the volcanic summit; most Hawaiian volcanoes have two or sometimes three of them. The accumulated lava of repeated eruptions from rift zones causes many Hawaiian volcanoes to have an elongated shape. Perhaps the best example of this is
Mauna Loa, which in
Hawaiian means "long mountain".
The reason lava often erupts from the flanks of Hawaiian volcanoes is gravity: it's easier for liquid lava, which is heavy, to flow laterally out the sides of a mountain than to be pushed up an additional several hundred or several thousand meters in elevation to be erupted from the summit. These systems of fissures that make up a rift zone allow this to happen more easily.
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