Formation mechanism of fault rocks in ductile-brittle regime

地震破裂在孕震带内的传播过程在各个尺度上都是复杂的，但缺乏足够的地质数据阻碍了对实际破裂和滑动过程的详细研究。在断裂带中以简单脉状或注入网络形式发现的与断层有关的假玄武岩被广泛认为记录了“化石”地震，即在脆性-半韧性和韧性状态下沿断层发生的地震滑动事件。假硅质岩是少数几种记录了从脆性到韧性状态的古断层地震性质的材料之一。本文列举了在地壳浅-深脆-韧性状态下同一剪切带中C-铂和M-铂共存的实例。在此期间发生了3次大地震：集集(台湾)地震、鸟取县西武地震和中昆仑(中国)地震。我们还开展了实地考察，了解地震断裂、活动断裂和发震构造之间的关系。与该项目有关的37篇论文已在国际和国内期刊上发表，并已列入发表名单。

The process of earthquake rupture propagation within a seismogenic zone is inherently complex at all scales, but a lack of adequate geologic data inhibits any detailed investigations into the actual process of rupture and slip. Fault-related pseudotachylytes found as simple veins or injected networks in fault zones are widely considered to record "fossil" earthquakes, i.e. events of seismic slip along faults within brittle to semi-ductile and ductile regimes. Pseudotachylyte is one of only a few materials that record the seismic nature of ancient faults from the brittle to ductile regimes. This study presents some examples of the coexistence of C-Pt and M-Pt generated in the same shear zone in the brittle-ductile regimes from shallow-deep crust.During this study period, there are 3 large earthquake occurred : Chi-Chi (Taiwan) earthquake, Totori-ken Seibu earthquake, and Central Kunlun (China) earthquake. We also carried out the field investigations to understand the relationship between the seismic fault, active fault, and seismogenic structures.37 papers related to this project have been published in international and domestic journals, which have been shown in the publication list.