Abstract
The base depth distributions of 16 Quaternary marine clay beds (Ma-1 bed-Ma10 bed) in Osaka Plain were investigated statistically with 13 deep core drilling data.
The result of the investigation was that the base depth distribution of marine clay beds at these drilling site is explained by one-dimensional linear approximation with two coefficients, such as coefficients on thickness and vertical displacement, based on the OD-1 drilling data which is used as the standard stratigraphy in Osaka Plain. The standard probability curve on base depth of marine clay beds was created from probability distribution of each marine clay bed based on the OD-1 site with the linear relation. The standard curve revised appropriately with the two coefficients can represent the distribution of marine clay bed and geological structure in Osaka Plain.
This standard curve was preliminarily applied to the interpretation of a depth section of seismic reflection survey. The correlation of reflectors with basis of marine clay beds was attempted by analysis of the interrelation between reflectors and the standard curve revised with the two coefficients. The result of this attempt shows that this method is effective to investigate the activity of faults and three-dimensional distribution of marine clay beds.
