Lava lakes are large volumes of molten lava, usually basaltic, contained in a vent, volcanic crater, or broad depression. Scientists use the term to describe both lava lakes that are molten and those that are partly or completely solidified. Lava lakes can form (1) from one or more vents in a crater that erupts enough lava to partially fill the crater; (2) when lava pours into a crater or broad depression and partially fills the crater; and (3) atop a new vent that erupts lava continuously for a period of several weeks or more and slowly builds a crater higher and higher above the surrounding ground. Look up lava, Aa, pahoehoe in Wiktionary, the free dictionary. ... Basalt Basalt is an extrusive igneous rock, sometimes porphyritic, and is often both fine-grained and dense. ... Perhaps the most conspicuous part of a volcano is the crater, a basin of a roughly circular form within which occurs a vent (or vents) from which magma erupts as gases, lava, and ejecta. ... A volcano is a geological landform (usually a mountain) where magma (rock of the Earths interior made molten or liquid by extremely high temperatures along with a reduction in pressure and/or the introduction of water or other volatiles) erupts through the surface of the planet. ...
As the eruption continued, lava poured down the wall of the crater, the lavalake grew larger and deeper, and both the rate the lava extruded from the vent and the size of the lava fountain increased.
During the second phase of the eruption, lava spilled from the lavalake in the deeper east crater and began to flow into the west crater.
Lava from the fissures cascaded over the rim of the caldera and nearly buried all of the flows from the August 1971 eruption.
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