Proceedings of the 12th International INQUA meeting on paleoseismology, active tectonic and archaeoseismology

70 PATA Days 2024 Fig. 2: Secondary surface rupture along the Wakayama valley, with reverse and left-lateral kinematics. Fig. 3: Secondary surface rupture nearby Kaiso port along the western coast, with reverse coseismic kinematics on an inherited normal fault. The scarps have been followed over ~3-4 km; scarp height reaches 2 m at maximum and lateral component 1.2 m. During our field work, we also documented secondary ruptures at different spots: the most striking are (i) first, on the rocky beach close to Kaiso port, with 1.5 m vertical offset on inherited (Miocene?) NNE-trending normal fault (Figure 3) and (ii) second, a right- lateral offset (0.25 m) across the Monzen tunnel (Tun, Figure 1). In addition, a normal fault-bounded coseismic graben (500 m long, 1 mmaximum offset) was mapped at short distance from the shoreline in Ishigamimachi (Ish): in this area of significant long- term and coseismic uplift, those features could be interpreted as bending-moment deformation, also considering that they occurred along a long-term and short graben. Finally, near Togi, left-lateral offsets were identified associated with liquefaction, along a section of a WNW-trending fault. A consequence of offshore faulting on a south dipping reverse fault, running along the close shoreline, is a stunning coastal uplift. This effect is recognized in the field along the ~80-km long strand of the NP western and northern shoreline.