1996 Volume 105 Issue 3 Pages 297-305
Four major seismic sequences (A, B, C, and pre Quaternary basement) and a major seismic sequence boundary (Reflector T) of an erosional unconformity were recognized in the Tsushima and Korea Straits as a result of shallow seismic stratigraphy. Subsequent sequences A, B, and C were interpreted as recent post-glacial marine transgression sequence, pre glacial marine regressive sequence, and Pleistocene pre-glacial sequence with topmost marine transgressive sequence, respectively.
We estimate that the Reflector T was probably formed by an erosion due to subaerial exposure of the sequence (sequences B or C or the basement) lying immediately below the Reflector T during the last glacial period (LGP) of isotopic stage 2. The existence of the erosional unconformity, the Reflector T, suggests that the Tsushima and Korea Straits were land and the Korean Peninsula was connected with the Japanese Islands during the LGP.
