A small gap about wide, which is known as the Pica gap but includes the Pliocene-Pleistocene Alto Toroni volcano that features vigorous seismic activity, separates Irruputuncu from Isluga in the north. Irruputuncu is part of an elliptical alignment of volcanoes that extends to the east, which may be linked to a cup-shaped intrusion in the crust. Older Pliocene volcanoes around Irruputuncu are Laguna volcano to the northeast and Bofedal to the southeast. Irruputuncu lies at the end of a chain of volcanoes that trends northeastward away from it.