| 数值模拟探讨青藏高原东部应力应变场及断裂活动性 |
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| 关键词:eastern Tibetan Plateau numerical simulation stress strain rate |
| 基金项目:中国地质调查局地质调查项目(编号: DD20160268; 12120113038000);国家自然科学基金(编号: 41641039; 41574090);中国地质科学院基本科研业务费(编号: YYWF201720) |
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| 摘要: |
| Numerical Study of the Crustal Stress, Strain Rate and Fault Activity in the Eastern Tibetan Plateau |
| The seismic activity in the eastern part of the Tibetan Plateau is very strong. The localization of stress and strain rate is very important for the active tectonic study. In this study, based on geological data and rock mechanical properties, the authors constructed a numerical model. With the constraint of GPS observation, the localization of stress and strain rate and the activity of major faults in this area were investigated. The results show that the convergence velocity, the maximum compressive strain rate and the maximum compressive stress are very high around the Indo-Asian collision zone. With decreasing distance from the collision zone, their values decrease accordingly. Around the eastern Himalayan syntaxis, a series of faults form a arcuate structural system. The localization of stress and strain rate along these faults is very high, which indicates that the seismic activity is strong in this area. Faults such as Yushu–Xiangshuihe–Xiaojiang faults, Batang–Jingshajiang faults and Jiali fault control the rotation and extrusion of substances in the southeastern Tibetan Plateau. Along other faults and in the interior of blocks, the localization of stress and strain rate is low. The faults with high strain rate spend short time to reach yield strength, indicating short earthquake recurrence period. |
| CHEN Xiao-yun,GUO Chang-bao,WU Zhong-hai,FAN Tao-yuan,LI Hai-long.2017.Numerical Study of the Crustal Stress, Strain Rate and Fault Activity in the Eastern Tibetan Plateau[J].Acta Geoscientica Sinica,38(3):385-392. |
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