Fig. 13.
From: Seismicity and crustal structure in the vicinity of the southern Itoigawa-Shizuoka Tectonic Line
Major geological units in the southern Japanese Alps area and tectonic interpretation of the tomographic results. Kofu: Kofu basin sediments; Volc.: Volcanic rocks; Trench: Trench fill sediments; Koma: Komaterrane; Misaka: Misaka terrane; Intr.: Granitic intrusions; Shimanto: Shimanto belt; Chichibu: Chichibu belt; Sanbagawa: Sanbagawa belt; Ryoke: Ryoke belt. See also legend in Fig. 2. The * represents the Ichinose fault depth extension after Ikeda et al. (2009). The dashed lines represent the possible boundary between the Koma block and the Misaka block in the Izu-Bonin Arc middle crust (Izc) (black), and the velocity boundary of the Misaka terrane and the Izu-Bonin Arc middle crust (white). The geological ISTL represents the inactive Miocene boundary between the Cretaceous-Tertiary accretionary prism of the southwest Japanese arc and the Koma block of the Izu-Bonin volcanic arc (solid black line starting from the Onajika-toge fault). In contrast, the neotectonically active ISTL is attributed to a reactivation of the boundary fault between the Koma and the Misaka blocks (dashed line starting from the Ichinose fault).