Geohistory of the San-in and Kita-Kyushu Areas Inferred from Seismic Studies.

Seismic evidence of divergent rifting and subsequent deformation in the southern Japan Sea, and a Cenozoic tectonic synthesis of the eastern Eurasian margin

“…A similar stress regime was confirmed in the northeastern part of southwest Japan on the basis of structural analysis of pre-Neogene rocks (Kano, 2002;Yamakita and Otoh, 2002). Although the intra-arc deformation diminished to the west (Itoh and Ito, 1989), middle Miocene synclinal trends (Itoh et al, 1992;JNOC, 1990) on the back-arc shelf, and contemporaneous coastal sediments (solid stars in Fig. 6(d): Igi et al, 1987) indicate that the bending event affected the regional deformation mode.…”

“…Emplacements of the rift-margin type volcanism (Early Miocene) are after Ishiwatari and Ishida (1995); Ishida et al (1998). Middle Miocene synclinal axes on the back-arc shelf, and coeval marine sediments on the Japan Sea coast are compiled from Itoh et al (1992); JNOC (1990), andIgi et al (1987), respectively. lithosphere and block rotations was a later (early Miocene) event resulting from considerable spreading of the back-arc basin. Fig.…”

Micropaleontological and seismic observations for early developmental stage of the southwestern Ulleung Basin, East Sea (Japan Sea)

“…1999). This zone extends eastward into the southeastern Ulleung Basin, where ENE‐trending folds are present (Minami 1979; Itoh et al . 1992; Choi et al .…”

“…The Deformed zone (or 'Dolgorae' area) south of the thrust belt is characterized by uplift and folding and faulting of the Miocene succession as a result of back-arc closing caused by changes in the motion of the Philippine Sea Plate (Chough & Barg 1987;Lee et al 1999). This zone extends eastward into the southeastern Ulleung Basin, where ENE-trending folds are present (Minami 1979;Itoh et al 1992;Choi et al 1994;Itoh 2000). In the Undeformed Zone (or 'Gorae' area), the sedimentary successions are comparatively undisturbed except for a broad anticlinal fold zone in the middle (anticlinal flexure;Chough et al 1997).…”

“…These previous studies have mainly focused on analyses of seismic profiles (Minami 1979;Chough & Barg 1987;Itoh et al 1992;Yoon et al 2003). This is because accessibility to the samples of drilled sediments had been limited.…”