“…We targeted the southern Ryukyu islands where the 1771 Meiwa event occurred and where the inferred seismic coupling estimated from GPS survey and paleotsunamis studies is one of the highest in the arc (5%–35%, Watanabe & Tabei, 2004; 20%, Ando et al., 2018). Fossil coral colonies and microatolls were documented and studied in the area (e.g., Sowa et al., 2014; Yamaguchi, 2016; Yamano et al., 2019) but never for modern tectonic purposes.…”