Fig. 1

Index map of Aso volcano. Red lines denote volcanic craters; dots represent areas of volcanic cones; bold lines and dashed lines denote observed and estimated active faults, respectively; and the fine dashed lines denote the lineaments. The bold dashed square represents the study area. This map was created following Ono and Watanabe (1985). Jn, Janoo scoria cone; Ko, Komezuka volcano; Kk, Kamikomezuka scoria cone; Oj, Ojodake volcano; Ks, Kishimadake volcano; Na, Nakadake volcano; Nr, Naraodake volcano; T, Takadake volcano; M, Maruyama volcano; Kp, Kusasenrigahama volcano; E, Eboshidake volcano; O, Okamadoyama volcano; Y, Yomineyama volcano; Tn, Takanoobane volcano; N, Nekodake volcano