Abstract
The seismic stratigraphy of Quaternary subsurface sediments around Kobe area has been analyzed from selected seismic profiles, namely Toga-gawa, Juniken-doro, and Shuku-gawa lines. The lithostratigraphic condition from the nearest boring cores, namely Maya (MY), GS-K1 and Minami-Ashiyahama (SA), is considered as a basis to identify the characteristics of reflections in each profile. The seismic profile is then divided to produce zonation. The result shows that there are 2 major seismic zones. The seismic zone N shows non-parallel, very poor to non-continuity and non-clarity reflections, which can be correlated with the Miyakojima Formation. The seismic zone P shows parallel, good to poor continuity and clarity reflections, which can be correlated with the Tanaka Formation. Based on the amplitude and interval of reflections, the seismic zone P is divided to become sub-seismic zones P1 and P2. The sub-seismic zone P1 is correlated with the intercalation of sand, silt, volcanic ash layers and thin marine clay beds within Ma-1 to Ma 2 beds. And the sub-seismic zone P2 is correlated with the intercalation of gravel, sand, silt, volcanic ash layers and thin marine clay beds within Ma 2 to Ma 12 beds. This result shows similarity with seismic stratigraphy division in the neighborhood of the Osaka Plain.
