项目编号: | 1727661
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项目名称: | Bulk rheology of fault damage zone materials and its implication for interseismic fault mechanics |
作者: | Hiroki Sone
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承担单位: | University of Wisconsin-Madison
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批准年: | 2017
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开始日期: | 2017-08-01
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结束日期: | 2020-07-31
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资助金额: | 338895
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资助来源: | US-NSF
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项目类别: | Standard Grant
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国家: | US
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语种: | 英语
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特色学科分类: | Geosciences - Earth Sciences
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英文关键词: | damage zone
; fault
; chelungpu fault
; off-fault
; fault plane
; current earthquake fault model
; fault core
; total fault deformation
; project
; permanent off-fault deformation
; fault mechanic
; numerical fault mechanic model
; steady off-fault deformation
; fault frictional property
; taiwan
; high-quality core material
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英文摘要: | This project aims to better understand the tectonic loading process leading to devastating earthquakes in major plate boundaries. Advances in the past decade allows scientists to capture and simulate first-order characteristics of the earthquake cycle, but challenges remain in understanding the randomness and spatial variability of earthquake phenomena. This project specifically focuses on one of the complexities that may arise due to the fact that faults may not only slip at the very fault plane itself, but the surrounding damaged rock can also deform to accommodate plate motion. The project, carried out in collaboration with researchers from National Central University, Taiwan, involves characterization of damage zone samples from the Chelungpu fault, Taiwan, coupled with deformation experiments on those samples to explore the behavior of the damage zone under stress. Better understanding of such phenomena will illuminate what is still lacking in current earthquake fault models and lead to improved accuracy of seismic hazard analyses. The project would also advance desired societal outcomes through a strong research collaboration with Taiwanese scientists plus the opportunity for graduate students to exchange scientific ideas and cultural experiences essential to foster future generation of scientists who will work in an international collaborative environment.
The objective of this study is to characterize the ductile deformational properties of fault damage zone rocks and to evaluate the importance of such behavior on fault mechanics. Most analytical and numerical fault mechanics models treat faults as a frictional interface embedded between elastic host rocks and does not take into account the peculiar characteristics of the damage zone surrounding the fault plane. However, damage zone rocks may undergo time-dependent ductile deformation even under crustal conditions, which has significant consequences on how shear stress develops on a fault during the interseismic period. The project focuses on the Chelungpu fault, Taiwan, where the high-quality core material was recovered from the 2004 International Continental Drilling Project. Detailed description of the fault damage zones in the Chelungpu fault system will be made with emphasis on fracture density, followed by creep experiments using damage zone samples to measure time-dependent strain behavior. Using lab-derived constitutive equations, deformation behavior of the damage zone under tectonic conditions will be evaluated. The ductile constitutive law will be combined with fault frictional properties in a numerical model to quantify the relative contribution of each domains, damage zone and fault core, to the total fault deformation during interseismic tectonic loading. Many geophysical observations suggest that permanent off-fault deformation may be occurring over long time scales (greater than a year). If, for instance, the partial-coupling of subduction interfaces inferred from geodetic studies is indeed due to steady off-fault deformation, the study may impact understanding of the stress accumulation process during interseismic tectonic loading. |
资源类型: | 项目
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标识符: | http://119.78.100.158/handle/2HF3EXSE/89434
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Appears in Collections: | 全球变化的国际研究计划 科学计划与规划
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Recommended Citation: |
Hiroki Sone. Bulk rheology of fault damage zone materials and its implication for interseismic fault mechanics. 2017-01-01.
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