Three-dimensional mechanical modeling of large-scale crustal deformation in China constrained by the GPS velocity field
Three-dimensional mechanical modeling of large-scale crustal deformation in China constrained by the GPS velocity field
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GPS速度场约束下的中国大范围地壳变形三维力学模拟
DOI：
10.1016/j.tecto.2007.11.006
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发表时间：
2008
期刊：
影响因子：
2.9
通讯作者：
Jian Wang
中科院分区：
文献类型：
--
作者：
Jian-Kun He;Zheng-Ren Ye;Jian Wang
利用三维有限元程序ADELI，建立了中国地区地壳相对欧亚板块运动的定量模型。该模型由弹塑性上岩石圈和粘弹性下岩石圈组成。岩石圈由其底部的静水压力支撑。印度-欧亚碰撞被模拟为速度边界条件。在模拟中引入了10条大型断层作为库仑型摩擦带。东北向速度分量差的均方根值(RMS(UE)和RMS(Un))介于观测和预报之间，可作为评估模拟结果的指标。通过调整断层摩擦系数，考虑了岩石圈粘度变化和地形载荷的影响，模拟了中国地区的长期地壳形变。我们的结果表明，大多数大型断层摩擦不大于0.1，这与其他大型断层，如北安纳托利亚断层(Provost，A.S.，Chery，J.，Hassani，R.，2003)一致。北安纳托利亚断裂GPS速度场的三维力学模拟地球星球。SCI。让我们来吧。209,361-377)和圣安德烈亚斯断层(芒特，V.S.，苏佩，J.，1987)。圣安德烈亚斯断层附近的应力状态：对扭动构造的影响。地质学，15,1143-1146)。此外，我们还考察了大断裂、岩石圈粘性结构和地形载荷三个原因对中国地区地壳长期形变的影响。结果表明，岩石圈粘性结构和地形载荷对中国地区的地壳形变有重要影响，而大断层的影响较小。虽然我们的模拟很好地再现了中国地区的地壳运动概貌，但该模型与四川-云南地区的全球定位系统速度场的一致性较差。这可能是由于我们的简单模型造成的，例如断层从模型表面到底部都是垂直的，并且忽略了缅甸板块俯冲造成的影响。
We present a quantitative model for the crustal movement in China with respect to the Eurasia plate by using the three-dimensional finite element code ADELI. The model consists of an elastoplastic upper lithosphere and a viscoelastic lower lithosphere. The lithosphere is supported by the hydrostatic pressure at its base. The India–Eurasia collision is modeled as a velocity boundary condition. Ten large-scale faults are introduced as Coulomb-type frictional zones in the modeling. The values for the root mean square (RMS) of the east and north velocity components differences (RMS(Ue) and RMS(Un)), which are between the observation and the prediction, are regarded as the measurements to evaluate our simulations. We model the long-term crustal deformation in China by adjusting the faults frictions ranged from 0.01 to 0.5 and considering the effects resulted from lithospheric viscosity variation and topographic loading. Our results suggest most of the large-scale faults frictions are not larger than 0.1, which is consistent with other large-scale faults such as the North Anatolian fault (Provost, A.S., Chery, J., Hassani, R., 2003. Three-dimensional mechanical modeling of the GPS velocity field along the North Anatolian fault. Earth Planet. Sci. Lett. 209, 361–377) and the San Andreas fault (Mount, V.S., Suppe, J., 1987. State of stress near the San Andreas fault: implications for wrench tectonics. Geology, 15, 1143–1146). Further, we examine the effects on the long-term crustal deformation in China of three causes: the large-scale faults, lithospheric viscosity structure and topographic loading. Results indicate that the lithospheric viscosity structure and the topographic loading have important influences on the crustal deformation in China, while the influences caused by the large-scale faults are small. Although our simulations satisfactorily reproduce the general picture of crustal movement in China, there is a poor agreement between the model and the observed GPS velocity field in Sichuan–Yunnan area. It may result from our simple models such as that the faults are all vertical from model surface to bottom and that the effects caused by the subduction of Burma slab are neglected.
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影响因子：
5.8
作者：
A. Draut;P. Clift
通讯作者：
A. Draut;P. Clift
影响因子：
--
作者：
P. England;G. Houseman;L. J. Sonder
通讯作者：
P. England;G. Houseman;L. J. Sonder
影响因子：
--
作者：
W. Holt;N. Chamot‐Rooke;X. Pichon;A. Haines;B. Shen-Tu;J. Ren
通讯作者：
W. Holt;N. Chamot‐Rooke;X. Pichon;A. Haines;B. Shen-Tu;J. Ren
DOI：
10.1002/nag.1610130106
发表时间：
1989
影响因子：
4
作者：
Y. Leroy;M. Ortiz
通讯作者：
Y. Leroy;M. Ortiz
影响因子：
3.9
作者：
Calais, E;Vergnolle, M;Déverchère, J
通讯作者：
Déverchère, J