The main crater is  wide and is quite active with frequent small geyser and lava eruptions, however the last major eruptions were during 1952–54. Two more craters make up parts of the park, the extinct Von Frantzuis crater and the Botos crater.
The main crater is wide and frequently erupts with small geysers and lava flows, although the last major eruptions occurred between 1952 and 1954. Two additional craters are present within the park: Von Frantzuis crater and Botos crater.