Quaternary tectonic warping and strata formation in the southern Osaka Basin inferred from reflection seismic interpretation and borehole sequences

Neotectonic Intra-Arc Basins Within Southwest Japan — Conspicuous Basin-Forming Process Related to Differential Motion of Crustal Blocks

“…Similar events of crustal deformation are also confirmed in the Osaka Bay area. Itoh et al [43] and Inoue et al [44] indicated that a N-S warping (2 in Figure 7a) emerged around the mid-Quaternary and acted as a sedimentation divide in Osaka Bay. Basement altitude estimated from gravity (Figure 7b; [45]) implies that other subordinate structures emerged synchronous with the basin development.…”

Three-Dimensional Architecture of the Median Tectonic Line in Southwest Japan Based on Detailed Reflection Seismic and Drilling Surveys

“…Such a tendency and the gentle tilt of the sedimentary units imply the recent uplift of the southwestern basin margin. This is a north-trending basement high discovered by means of gravity, seismic, and borehole investigation (Figure 11; [20][21][22]). The homoclinal tilting of the upper unit is suggestive of the episodic and possibly ongoing uplift of the mound accompanied by basement deformation.…”

Numerical Assessment for the Behavior of the Pleistocene Marine Foundations due to Construction of the 1st Phase Island of Kansai International Airport

“…The importance of the permeability of the Pleistocene sand gravel layers was recognized through the in-situ measurement of the excess pore water pressure in the individual layers (Akai and Tanaka, 1999). On the basis of theˆndings by Itoh et al (2001), Takemura and Nakaseko (2005) summarized the status of the Pleistocene sand gravel deposits at KIX based on the geophysical and geological investigation. The brief evaluation for the individual sand gravel layers (Ds) is explained as follows: Ds1: This unit is correlated with the Tenma Formation at Osaka Plain.…”

“…In the sense, the phenomenon taking place due to the reclamation of KIX is proceeding far from the conventional concept of consolidation in which deformation advances associated with the dissipation of excess pore water pressure. Itoh et al (2001) summarized on the basis of the data from elastic wave exploration and in-situ boring logs that the Pleistocene sand gravel deposits are not always distributed uniformly in thickness, consistently and that the amount ofˆne contents included in them is signiˆcant. The most serious problem originating from these sand gravel deposits is the``permeability'' that controls the rate of consolidation of sandwiched Pleistocene clays because it does not necessarily follow that the net values of the coe‹cient of permeability based on laboratory experiments function as representatives for such nonuniform sand gravel layers with occasional horizontal discontinuity and/or variation of thickness.…”