Factors that affect coseismic folds in an overburden layer
Factors that affect coseismic folds in an overburden layer
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影响上覆层同震褶皱的因素
DOI：
10.1007/s11707-016-0618-8
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发表时间：
2018-01
影响因子：
2
通讯作者：
Yongen Cai
中科院分区：
文献类型：
--
作者：
Shaogang Zeng;Yongen Cai
隐伏逆冲断层诱发的同震褶皱在许多地震区都有观测到，受到了地质学家和地球物理学家的广泛关注。人们对褶皱运动学进行了大量的研究，但很少对褶皱动力学进行定量研究。本文建立了具有逆冲断裂带和构造应力载荷的概念模型，用有限元方法研究了影响同震褶皱的因素及其形成机制。数值结果表明，断层倾角是控制褶皱的关键因素。倾角越大，褶皱坡度越陡。第二个最重要的因素是覆盖层厚度。覆盖层越厚，褶皱就越平缓。在这种情况下，褶皱在实地调查中很难识别。因此，如果可以很容易地用肉眼识别褶皱，那么覆盖层很可能很浅。最不重要的因素是覆岩的力学参数。覆岩的杨氏模数越大，褶皱的位移和褶皱斜率就越小。断裂带附近覆岩的强烈水平挤压和垂直伸展是形成同震褶皱的主要机制。
Coseismic folds induced by blind thrust faults have been observed in many earthquake zones, and they have received widespread attention from geologists and geophysicists. Numerous studies have been conducted regarding fold kinematics; however, few have studied fold dynamics quantitatively. In this paper, we establish a conceptual model with a thrust fault zone and tectonic stress load to study the factors that affect coseismic folds and their formation mechanisms using the finite element method. The numerical results show that the fault dip angle is a key factor that controls folding. The greater the dip.angle is, the steeper the fold slope. The second most important factor is the overburden thickness. The thickerthe overburden is, the more gradual the fold. In this case, folds are fifficult to identify in field surveys. Therefore, if a fold can be easily identified with the naked eye, the overburden is likely shallow. The least important factors are the mechanical parameters of the overburden. Thelarger the Young’s modulus of the overburden is, the smaller the displacement of the fold and the fold slope. Strong horizontal compression and vertical extension inthe overburden near the fault zone are the main mechanisms that form coseismic folds.
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影响因子：
5.8
作者：
R. Larson
通讯作者：
R. Larson
DOI：
10.1061/(asce)0733-9410(1984)110:5(599
发表时间：
1984-05
期刊：
Journal of Geotechnical Engineering
影响因子：
--
作者：
D. Cole;P. Lade
通讯作者：
D. Cole;P. Lade
影响因子：
1.4
作者：
A. Geyer;Agust Gudmundsson
通讯作者：
A. Geyer;Agust Gudmundsson
影响因子：
2.9
作者：
J. Suppe
通讯作者：
J. Suppe
影响因子：
3.1
作者：
M. Qayyum;D. Spratt;J. M. Dixon;R. D. Lawrence
通讯作者：
M. Qayyum;D. Spratt;J. M. Dixon;R. D. Lawrence