Pit crater

Pit crater, also called pit craters are circular, steep-walled crater caused by the collapse of the soil, after initially including a stocked magma is drained. Unlike calderas one uses the term pit crater for crater to about 1.5 km in diameter.

Pit crater come more often in the rift zones of shield volcanoes before, such as on Mauna Loa or Kilauea in Hawaii or on the summit of Mount Garat on Gaua.

On the Erta Ale in Ethiopia, a pit crater is filled with an active lava lake.