Oblique air photo of Kilauea caldera (view to north). Halema'uma'u pit crater (H) was the location of an active lava lake from prior to the arrival of Westerners until 1924. The smoothness of the extra-caldera surface in the foreground is due to phreatomagmatic deposits from the large 1790 eruption (from Carr & Greeley 1980).

VolcanoWorld