[2] Other volcanic features include Kishimadake (Mount Kishima), Kusasenrigahama, Komezuka, a scoria cone, Ikenokubo maar, a tuff ring and Takanooban, a lava dome.

[5] Magma migrates diagonally upward from approximately 17 km (11 mi) depth through a northward-dipping magma-filled crack propagation zone, then into the shallow magma reservoirs mentioned already and during eruptions into an upright crack intrusion zone at 2–4 km (1.2–2.5 mi) depth.

The caldera formed from four major pyroclastic flow events which occurred between 90,000 and 270,000 years ago.

[7] Ashfall deposit greater than 15 cm (5.9 in) deep was identified on Hokkaido Island about 1,500 km (930 mi) to the north.

The volume of erupted products is much higher):[8] There are multiple active faults both under the volcano and adjacent on this area of the Amur Plate.

[4] The high resolution Bouguer gravity imaging of Kyushu has confirmed the caldera to be piston rather than funnel shaped, as originally proposed, and related to known active faults and in particular the gravity gradient zone of the Aso Caldera is part of the Oita-Kumamoto Tectonic Line (OKTL) gravity gradient zone and this appears to connect with the Japan Median Tectonic Lines gravity gradient zone, strengthening the evidence that the lines are closely related tectonic features.