“…Along the eastern margin of the valley (i.e., the western front of the mountain range), a number of fault outcrops have been identified, some of which show that the fault cuts young unconsolidated sediments (Figure 1C; Table 1). In outcrops, trench walls, and drilling surveys, the faults show typical reverse-slip features, such as east-side-up apparent offset, drag pattern, and flat-ramp geometry (e.g., Ryoo et al, 2001Ryoo et al, , 2002Ryoo et al, , 2004Choi et al, 2002Choi et al, , 2003Park et al, 2020;Kim et al, 2021c;Gwon et al, 2021;Naik et al, 2022;Park et al, 2022). The fault strands are featured by slightly curved multiple strands (generally NNW-SSE to N-S), which anastomose and link up with each other.…”