Contents

**Preface XIII**




Chapter 12 **Numerical Modeling of Sedimentary Basin Formation at the**

**Propagation has Occurred 273**

Tamaki

**Termination of Lateral Faults in a Tectonic Region where Fault**

Contents **VII**

Shigekazu Kusumoto, Yasuto Itoh, Osamu Takano and Machiko

Yasuto Itoh, Shigekazu Kusumoto and Keiji Takemura

## Chapter 12 **Numerical Modeling of Sedimentary Basin Formation at the Termination of Lateral Faults in a Tectonic Region where Fault Propagation has Occurred 273**

Chapter 5 **Tectonic Process of the Sedimentary Basin Formation and**

**Central Japan 109** Akira Takeuchi

**VI** Contents

**of Stress Regimes 129**

Gentaro Kawakami

Takeshi Nakajima

**Central Japan 209**

**on an Active Margin 233**

**Geomagnetic Data 255**

Yasuto Itoh

**Hokkaido, Northern Japan 131**

**Motion of Crustal Blocks 191**

Chapter 7 **Late Cenozoic Tectonic Events and Intra-Arc Basin Development in Northeast Japan 153**

**Evolution in the Late Cenozoic Arc-Arc Collision Zone,**

**Section 3 Intra-Arc & Foreland Basins Under the Influence of Fluctuation**

Chapter 6 **Foreland Basins at the Miocene Arc-Arc Junction, Central**

Chapter 8 **Neotectonic Intra-Arc Basins Within Southwest Japan —**

Chapter 9 **Tectonic Basin Formation in and Around Lake Biwa,**

Yasuto Itoh, Keiji Takemura and Shigekazu Kusumoto

**Section 4 Geophysical Methods for Basin Research: From Micro-Fabric to Quantification of Evolutionary Process 231**

Chapter 10 **Rock Magnetic Properties of Sedimentary Rocks in Central**

Yasuto Itoh, Machiko Tamaki and Osamu Takano

Chapter 11 **Characteristic Basin Formation at Terminations of a Large**

Yasuto Itoh, Shigekazu Kusumoto and Keiji Takemura

**Conspicuous Basin-Forming Process Related to Differential**

Keiji Takemura, Tsuyoshi Haraguchi, Shigekazu Kusumoto and

**Hokkaido — Insights into Sedimentary and Tectonic Processes**

**Transcurrent Fault — Basin Configuration Based on Gravity and**

Shigekazu Kusumoto, Yasuto Itoh, Osamu Takano and Machiko Tamaki

Preface

forearc region.

including the formation of sedimentary basins.

controls the formation of barriers to sediment influx.

This book presents the mechanisms of sedimentary basin formation on active plate margins. The crust of continental margins experiences tectonic stress as a result of the subduction of oceanic plates. A part of this strain is released elastically as earthquakes and the remainder causes permanent deformation. The formation process of crustal depressions, that is sedi‐ mentary basins, has been one of the most significant themes of Earth science because the thick deposits burying sedimentary basins are abundant in natural resources such as hydro‐ carbons; the densely populated overlying surface is also investigated from the viewpoint of natural disaster prevention. Practical aspects aside, sedimentary layers within a basin are an excellent record of long-term environmental change, and the mass balance of arc-trench sys‐ tems is understood by the integrated research of tectonic processes around active margins

The focus of this book is set on the eastern Eurasian margin, where most of the various types of tectonic episodes on active margins can be found and have been discussed through indepth studies. Since the amalgamation of the major continental blocks by the middle of the Mesozoic era, eastern Eurasia has been under the influence of the subduction of oceanic plates. For example, the rapid northerly migration of the Izanagi Plate during the early Cre‐ taceous gave rise to conspicuous tectonic events along the continental margin. It has been clearly established that the obliquity of subduction is a key factor in the mode of crustal de‐ formation. Namely, normal subduction results in a dominance of compressive stress on ac‐ tive margins, vigorous arc volcanism and provokes induced convection in the wedge of the upper mantle, leading to the eventual opening of a backarc basin. Oblique subduction acti‐ vates bisecting faults within arcs and causes a large amount of lateral transportation of crus‐ tal blocks. Prevailing shear stress affects the architecture of basins in forearc regions and

The chronicle of the sedimentary basin development around the Japanese Archipelago in

1) Prolonged transcurrent faulting from the late Cretaceous to Paleogene resulted in the for‐ mation of many pull-apart basins on the margin. The propagation of fault terminations caused a migration of depocenters; wrench deformation was related to compartmentaliza‐ tion of the basins. Trench slope breaks developed during some contraction episodes on the

2) Succeeding to the Philippine Sea Plate spreading, the Neogene was heralded by the emer‐ gence of rift zones and the backarc opening of the Japan Sea. It was also characterized by the remarkable rise of a compressive stress regime as a result of multiple arc-arc collision events such as the Kurilenortheast Japan collision around Hokkaido and the southwest JapanIzu-

the Eurasian active margin since the late Mesozoic is summarized as follows:
