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 primary crater is expansive and exhibits frequent minor geyser and lava flow activity. However, the most recent significant eruptions happened between 1952 and 1954.  Two other craters are located within the park: Von Frantzuis crater and Botos crater.