Seismic geomorphology of Miocene shelf-to-slope depositional system in the southeastern part of the Tsushima Basin

Kosuke EGAWA; Genki SAKATA; Hiroki MIYAMOTO; Yosuke ABE; Shinji MATSUURA; Tetsumi IMAMURA; Takateru HARA; Toru AKUTSU

Presentation information

Oral

Symbol H (Human Geosciences) » H-CG Complex & General

[H-CG35] Interdisciplinary approach to earth's changing surface

Wed. May 27, 2015 11:00 AM - 12:45 PM 105 (1F)

Convener:*Naofumi Yamaguchi(Center for Water Environment Studies, Ibaraki University), Hajime Naruse(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University), Koji Seike(Atmosphere and Ocean Research Institute, University of Tokyo), Hideko Takayanagi(Institute of Geology and Paleontology, Graduate School of Science, Tohoku University), Masayuki Ikeda(Shizuoka University), Chair:Koji Seike(Atmosphere and Ocean Research Institute, University of Tokyo)

11:15 AM - 11:30 AM

[HCG35-08] Seismic geomorphology of Miocene shelf-to-slope depositional system in the southeastern part of the Tsushima Basin

*Kosuke EGAWA¹, Genki SAKATA¹, Hiroki MIYAMOTO¹, Yosuke ABE¹, Shinji MATSUURA¹, Tetsumi IMAMURA¹, Takateru HARA¹, Toru AKUTSU¹ (1.INPEX Corporation)

Keywords:Seismic geomorphology, 3-D seismic survey, Tsushima Basin, Shelf-to-slope depositional system, Miocene

We report three-dimensional (3-D) seismic geomorphologic features of a shelf-to-slope depositional system in the southeastern part of the Tsushima Basin, offshore Southwest Japan, by using the 3-D seismic survey dataset of Shimane-Yamaguchi-oki. The studied Miocene succession presents seismic facies characterized by incised valleys/channels and subsequent multiple stacked slope channels from shelf to slope, with well-developed clinoform reflections. Such seismic aspects strongly suggest the development of a prograding delta system during Miocene time similar to offshore South Korea.