Integrated study of material analysis of drilled core and geophysical borehole logging of Chelung-pu fault, Taiwan

台湾车笼埔断层岩心材料分析与地球物理钻孔测井综合研究

• 批准号: 13573009
• 负责人: KIMURA Gaku
• 金额: $ 7.68万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13573009/
• 关键词: Taiwan; Chelungpu fault; Fault zone drilling; Chi-Chi earthquake; Intrafault materils; Frictional heating

Through this integrated research, three research groups, (1) Geophysical logging group, (2) Material analysis group, and (3) Geological investigation group presented the results as follows.(1) Geophysical logging group : Fiber thermistor was installed into the Nantou Borehole (160m depth). Continuous monitoring of temperature had been performed, which clarified that there was a broad low-temperature region 30 to 40m above the fault surface. This would be caused by inflow of cold ground water into the region from very close to the surface. The permeable region would be enhanced by increase in pore volume by fracturing of rocks by an earthquake. The results of temperature logging performed right after the drilling indicate that broad increase in temperature around the fault zone in both northern and southern boreholes. Coefficients of friction during earthquake slip are estimated using these data to be around 0.2 and 0.8 to the northern and southern fault surface.(2)Material analysis gro … More up : distribution of fault zone rocks was examined in detail by observations. The results clarified contrasting mode of fault rock distribution between northern and southern fault zones. The fault rocks of northern fault zone are composed of thin (<1cm in thickness) slip layer composed of clay minerals surrounded by thick (>10min thickness) 'random-fabric' fault breccia. Those of southern fault zone are composed of thick (around 1m in thickness) ultra-cataclasite (relict Pseudotachyite fragments are included) zone, surrounded by thick (> 10min thickness) 'foliated' fault breccia. These contrasting characteristics of fault rock distribution may correspond to the contrasting mode of historical slips between northern and southern fault zones.(3) Geological investigation group : Vitrinite reflectance was utilized to estimate frictional heating within slip zones. Several shear zones around Chelungpu fault was tested by this method. The results clarified that reflectance was raised within a shear zone. Quantitative esitimation will be testified by experiments. Less

通过这项综合研究，三个研究组，（1）地球物理记录组，（2）材料分析组和（3）地质投资组提出了如下的结果。（1）地球物理记录组：纤维热敏球员安装到Nantou Borehole（160m深度）中。对温度进行了连续监测，这阐明了在断层表面上方30至40m的宽阔的低温区域。这可能是由于冷水从非常靠近地面的流入地区流入该区域所致。通过地震将岩石压裂，可以通过增加孔体积来增强可渗透区域。钻井后立即执行的温度记录结果表明，北部和南部井眼周围温度的较大升高。使用这些数据估计地震滑移期间的摩擦系数在北部和南部断层表面的0.2和0.8左右。（2）材料分析GRO…更多：更多：通过观察详细检查了断层区岩石的分布。结果阐明了北方断层区域之间断层岩石分布的对比模式。北部断层区域的断层岩石由薄（厚度<1厘米）的滑动层组成，该滑动层由粘土矿物组成，这些粘土矿物被厚（> 10分钟的厚度）“随机 - 固定”断层角砾岩组成。南部断层区的那些由厚（厚度约为1m）组成的超ot骨岩（包括遗物伪造片碎片）区域，周围环绕着厚（> 10分钟的厚度）“叶状”断层角砾岩。这些断层岩石分布的这些对比特征可能对应于北部和南部断层区域之间历史滑移的对比模式。（3）地质投资组：玻璃体反射率可用于估计滑动区域内的摩擦加热。通过这种方法测试了Chelungpu断层周围的几个剪切区。结果阐明了反射率是在剪切区内提出的。定量的消性将通过实验测试。较少的

项目成果

H.Tanaka, A.Sakaguchi et al.: "Outline results of drilling investigation of Chelung-pu fault zone."Special Issue of Earth monthly "Seismogenic zone drilling within subduction zones". 36. 97-106 (2002)

H.Tanaka、A.Sakaguchi 等：“车笼铺断裂带钻探调查概要”。地球月刊“俯冲带内地震带钻探”特刊。

C.Y.Wang, H.Tanaka et al.: "Shallow reflection seismics aiding geological deilling into the Chelungpu fault after the 1999 Chi-Chi earthquake, Taiwan"Terrestrial, Atmospheric and Oceanic Sciences. (印刷中). (2002)

C.Y.Wang、H.Tanaka 等人：“1999 年台湾集集地震后浅层反射地震有助于车龙埔断层的地质作用”，《陆地、大气和海洋科学》（2002 年出版）。

R.Heemance, Z.K.Shipton, J.P.Evans: "Structural controls and the nature of slip distribution for Earthquake propergation in the 1999 rupture of the northen end of the Chelung-pu fault, Taiwan"ICDP workshop on drilling the Chelungpu fault, Taiwan. Vol.2. 2

R.Heemance、Z.K.Shipton、J.P.Evans：“1999 年台湾车龙埔断层北端破裂时的结构控制和滑移分布性质，”台湾车龙埔断层钻探 ICDP 研讨会。

C.Y Wang, H.Tanaka et al.: "Shallow reflection seismics aiding geological drilling into the Chelungpu fault after the 1999 Chi-Chi earthquake, Taiwan"Terrestrial, Atmospheric and Oceanic Sciences. 12. 153-170 (2002)

C.Y Wang、H.Tanaka 等人：“1999 年台湾集集地震后浅反射地震有助于车龙埔断层地质钻探”陆地、大气和海洋科学。

S.Huang, J.Wu, J.Hung, H.Tanaka: "Studies of Sedimentary Fades, Stratigraphy, and Deformation Structures of the Chelungpu Fault Zone on cores from Drilled Wells in Fengyuan and Nantou, Central Taiwan."Terrestrial, Atmospheric and Oceanic Sciences. 13. 253

S.Huang、J.Wu、J.Hung、H.Tanaka：“基于台湾中部丰原和南投钻井岩芯的车龙埔断裂带沉积衰落、地层学和变形结构研究”。