San Jerónimo is part of a long alignment of volcanoes along the Calama-Olacapato-El Toro fault. This string of volcanoes is diverse, including calderas and stratovolcanoes on the one hand and plutons and monogenetic volcanoes on the other hand. One volcano that is part of this structure is Aguas Calientes caldera, on whose border the San Jerónimo volcano is constructed.