Understanding the physical processes of frictional slip of subduction zone earthquakes from the characteristics of fault rocks.
从断层岩特征认识俯冲带地震摩擦滑移物理过程
基本信息
- 批准号:12440132
- 负责人:
- 金额:$ 9.79万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2000
- 资助国家:日本
- 起止时间:2000 至 2001
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Followings were known from the analysis of the core samples from the southern and northern boreholes penetrating the Shelungpu fault, the seismic fault of the 1999 Chi-Chi earthquake in Taiwan.1. At the depth of 176m of the southern borehole, we found the crushed pseudotachylyte layer about 2m thick. Recycled pseudotachylyte grains are common, indicating that seismic slips have repeated in this shear zone. Very small part of grains of crushed pseudotachylyte record high temperature (up to 1730℃) signatures, but major part of grains shows the texture of very low degree of melting.2. At the depth of 223-227m and 283-320m of the northern borehole, we found the several shear zones of the Shelungpu fault. The fault core of these shear zones is composed of soft clay layer of 1-3cm thickness, and it is commonly associated with a layer of about 1m thick fault breccia with mosaic texture. Clay veins from the fault core frequently intrude the fault breccia. This clay injection structure suggests … More the generation of instantaneous and abnormally high pore pressure.3. The southern and northern parts of the Shelungpu fault behaved very differently during the 1999 Chu-Chu earthquake; moderate slip associating the radiation of high frequency wave, while very large and smooth slip lacking the radiation of high frequency wave. These contrasting slip behaviors appear to be consistent with the fault rocks. Namely, the highly viscous melt of very low degree of melting in the south would have restrained the seismic slip, while the slip would have been promoted by the elastohydrodynamic lubrication (Brodsky and Kanamori, 2001) of fault clay layer.We studied the comminution and fluidization of fault gouges through analyzing fault gouges.1. Comminution starts at the fractal dimension 2.5 of grain size frequency, and the fractal dimension increases as further comminution. Fractal granular materials can be packed most densely when the fractal dimension is 2.5. Therefore, comminution itself is a slip-weakening mechanism.2. We developed a new method how to distinguish the gouges whether they have experienced fluidization or not.3. Normal interface vibration by Brune et al. (1993) is a most plausible cause of fluidization, and we presented two field evidences that support this mechanism.4. The knowledge of powder science teaches us that fault plane becomes nearly frictionless when gouge is fluidized. Less
通过对1999年台湾集集地震的地震断层--社笼埔断层的南部和北方钻孔的岩心样品进行分析,我们知道以下几点:1.在南部钻孔176m处发现了约2m厚的破碎的假玄武玻璃层。普遍存在具褶皱的假玄武玻璃颗粒,表明该剪切带内曾多次发生地震滑动。破碎后的假玄武玻璃中,只有极少数颗粒记录到高温(1730 ℃)特征,但大部分颗粒显示出极低熔融度的结构.在北方钻孔223 - 227 m和283 - 320 m处,发现了社龙铺断裂的多条剪切带。这些剪切带的断层核由1 - 3cm厚的软粘土层组成,通常与一层厚约1m的断层角砾岩共生,具有镶嵌结构。断层核部的粘土脉经常侵入断层角砾岩中。这个粘土注入结构表明 ...更多信息 瞬时异常高孔隙压力的产生. 1999年楚-楚地震期间,社龙埔断裂的南、北方段表现截然不同,中等滑动伴随着高频波的辐射,而非常大而光滑的滑动则缺乏高频波的辐射。这些对比鲜明的滑动行为似乎是一致的断层岩。也就是说,南部熔融程度很低的高粘度熔体抑制了地震滑动,而断层粘土层的弹性流体动力学润滑(Brodsky and Kanamori,2001)则促进了地震滑动。粉碎开始于粒度频率的分形维数2.5,并且随着进一步粉碎,分形维数增加。当分形维数为2.5时,分形颗粒材料的堆积最致密。因此,粉碎本身就是一种滑移弱化机制.提出了一种新的判别断层泥是否经历过流态化的方法. Brune等人(1993)提出的界面振动是流化的最合理的原因,我们提出了两个支持这一机制的现场证据.粉体学的知识告诉我们,断层泥流化后,断层面几乎没有摩擦力。少
项目成果
期刊论文数量(20)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Seno, T., Otsuki, K., Yang, C.N.: "The 1999 Chi-Chi,Taiwan earthquake : A subdction zone earthquake on land"Bull. Earthq. Res. Inst. Univ. Tokyo. 75. 57-77 (2000)
Seno, T.、Otsuki, K.、Yang, C.N.:“1999 年台湾 Chi-Chi 地震:陆地上的俯冲带地震”Bull。
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- 影响因子:0
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Otsuki, K., Monzawa, N.: "Contrasting fault rocks from two boreholes penetrating Chelung-pu Fault, Taiwan"Proceedings of ICDP Workshop on Drilling the Chelungpu Fault, Taiwan, held on Sept. 27-29 in Taipei. (in press). (2002)
Otsuki, K.,Monzawa, N.:“对比来自台湾车龙埔断层的两个钻孔的断层岩石”9 月 27 日至 29 日在台北举行的 ICDP 台湾车龙埔断层钻探研讨会论文集。
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Monzawa, N., Otsuki, K.: "Comminution and fluidization of fault gouge : Their implications to fault slip behavior"Tectonophysics. (in press). (2002)
Monzawa, N., Otsuki, K.:“断层泥的粉碎和流化:它们对断层滑动行为的影响”构造物理学。
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Otsuki, K., Monzawa, N., Nagase, T.: "Fluidization and melting of fault gouge during seismic slip : The record in fault rocks with implications for focal earthquake mechanisms"J. Geophys. Res.. (in press). (2002)
Otsuki, K.、Monzawa, N.、Nagase, T.:“地震滑动过程中断层泥的流化和熔化:断层岩中的记录对震源地震机制的影响”J.
- DOI:
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- 影响因子:0
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- 通讯作者:
Monzawa, N. and Otsuki, K.: "Comminution and fluidization of fault gouge: Their implications to fault slip behavior."Tectonophysics. (in press). (2002)
Monzawa, N. 和 Otsuki, K.:“断层泥的粉碎和流化:它们对断层滑动行为的影响。”构造物理学。
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OTSUKI Kenshiro其他文献
OTSUKI Kenshiro的其他文献
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{{ truncateString('OTSUKI Kenshiro', 18)}}的其他基金
Basic study for prediction of large earthquakes off Miyagi Prefecture by monitoring deep groundwater fluctuations
通过监测深层地下水波动预测宫城县近海大地震的基础研究
- 批准号:
18204046 - 财政年份:2006
- 资助金额:
$ 9.79万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Research for the deformation field in middle to lower crust from the viewpoints of water-rock interactions.
从水-岩相互作用角度研究中下地壳变形场。
- 批准号:
14204047 - 财政年份:2002
- 资助金额:
$ 9.79万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Study on the Extension Tectonics of Northeast Honshu Arc Just Before 15 Ma.
本州岛东北弧15 Ma之前的伸展构造研究。
- 批准号:
01540622 - 财政年份:1989
- 资助金额:
$ 9.79万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)