**Author details**

and Osaka Bay are the largest and most important for understanding the paleoenvironmental changes in southwest Japan. Takemura and others in this book present a comprehensive

**Figure 8.** a) Sediment thickness diagram from the late Pliocene to early Pleistocene (from top of the basement to the Ma 2 marine clay intercalated in the Osaka Group) [42]. See Figure 7 for plan view and nomenclature of the analyzed domains. (b) Interval subsidence rates through the late Quaternary in the Osaka Plain [42]. See Figure 7 for locations

202 Mechanism of Sedimentary Basin Formation - Multidisciplinary Approach on Active Plate Margins

It is noted that the majority of the subordinate faults have a N-S azimuth (Figure 1). Their activity results in the formation of N-S warping zones within the island arc as shown in Figure 7. Based on detailed well stratigraphy, Itoh et al. [42] showed that the largest warping in the Osaka sedimentary basin (Uemachi basement-high; 1 in Figure 7a) has been developing since the late Pliocene (Figure 8a), and episodically grew around 550 kyr, which is shown by

history of the Lake Biwa sedimentary basin.

of the selected boreholes

Yasuto Itoh1 , Keiji Takemura2 and Shigekazu Kusumoto3

1 Graduate School of Science, Osaka Prefecture University, Osaka, Japan

2 Graduate School of Science, Kyoto University, Kyoto, Japan

3 Graduate School of Science and Engineering for Research, University of Toyama, Toyama, Japan

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