[H-CG35] 堆積・侵食・地形発達プロセスから読み取る地球表層環境変動

[HCG35-08] 対馬堆積盆南東部における中新統陸棚－斜面堆積システムの震探地形学的特徴

*江川 浩輔¹、坂田 玄輝¹、宮本 広樹¹、阿部 洋祐¹、松浦 紳二¹、今村 哲己¹、原 尊照¹、阿久津 亨¹ (1.国際石油開発帝石株式会社)

キーワード：震探地形学, 3次元地震探査, 対馬堆積盆, 陸棚－斜面堆積システム, 中新統

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.