Stress Model NE Tibet

Stress Field in the NE Tibetan Plateau

PhD thesis X. Li

3-D geomechanical model of the northeastern Tibetan Plateau and its application in seismic hazard assessment

(a) Distribution of active faults (black lines) and large earthquakes (M≥8, red circles) in the northeastern Tibetan Plateau. (b) Finite element model of the study area that contains faults and consists of the layered crust and the top of the upper mantle.
(a) Distribution of active faults (black lines) and large earthquakes (M≥8, red circles) in the northeastern Tibetan Plateau. (b) Finite element model of the study area that contains faults and consists of the layered crust and the top of the upper mantle.

Crustal stress plays a key role in the occurrence of earthquakes and it is important to study the distribution and evolution of the stress field to better understand the occurrence and development of an earthquake. The northeastern Tibetan Plateau, characterized by active faults and folds, is undergoing widespread strong tectonic activity. Several large earthquakes with M8 and above have occurred in this area historically, causing great financial losses and social fatalities. Thus, it is of great significance to study the kinematics and dynamics of the northeastern Tibetan Plateau for better seismic hazard assessment. Numerical modelling is an important and powerful tool to quantitatively study the stress and strain field. Based on the findings from geological, geophysical and geodetic studies, we establish a comprehensive 3-D geomechanical model which is consistent with the model-independent kinematic and stress observations. This model will provide important reference for assessing seismic hazard along large active faults in the northeastern Tibetan Plateau. As a joint PhD. program, this work is supported by the China Scholarship Council (CSC).

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