The India plates continuous motion to the north, the convective removal to the thickening lithosphere caused by small-scale mantle convection and the effect of denudation on the uplifted plateau are regarded as main d...The India plates continuous motion to the north, the convective removal to the thickening lithosphere caused by small-scale mantle convection and the effect of denudation on the uplifted plateau are regarded as main driving forces that make the patterns of stress field of East Asia continent at present time. The method of numerical simulation is used to study the deformation and the stress field of East Asia continent under different boundary conditions, different denudation coefficients and different rock mechanics parameters within a trapezoid geological frame. Comparing with the results obtained by modern space geodetic technique (such as GPS) the results derived from seismological data show that the predicted data by our model can fit them very well. The degree of the fitness in the west is better than that in the east. These results imply that the main driving force of the deformation and the stress patterns of the west part of East Asia continent may come from the collision and compression between the India and the Eurasia plates. The interaction to the Pacific and the Philippines plates in the east part need to be considered. It also shows that the convective removal to the thickening lithosphere caused by small-scale mantle convection and the effect of denudation cannot be negligible in the evolution of the stress patterns.展开更多
Based on the collection of active fault slip rate data of large intra-continental shallow thrust earthquakes occurring in the triangular seismic region of the East Asia continent,a preliminary analysis has been perfor...Based on the collection of active fault slip rate data of large intra-continental shallow thrust earthquakes occurring in the triangular seismic region of the East Asia continent,a preliminary analysis has been performed with results showing that the Wenchuan,Sichuan, China earthquake ( MS = 8.0) of May 12,2008 occurred on the Longmenshan Mountain active fault with an abnormally low slip rate.展开更多
基金The Development Program on National Key Basic Researches under the Project Mechanism and Prediction of Continental Strong Earthquakes (G19980407).
文摘The India plates continuous motion to the north, the convective removal to the thickening lithosphere caused by small-scale mantle convection and the effect of denudation on the uplifted plateau are regarded as main driving forces that make the patterns of stress field of East Asia continent at present time. The method of numerical simulation is used to study the deformation and the stress field of East Asia continent under different boundary conditions, different denudation coefficients and different rock mechanics parameters within a trapezoid geological frame. Comparing with the results obtained by modern space geodetic technique (such as GPS) the results derived from seismological data show that the predicted data by our model can fit them very well. The degree of the fitness in the west is better than that in the east. These results imply that the main driving force of the deformation and the stress patterns of the west part of East Asia continent may come from the collision and compression between the India and the Eurasia plates. The interaction to the Pacific and the Philippines plates in the east part need to be considered. It also shows that the convective removal to the thickening lithosphere caused by small-scale mantle convection and the effect of denudation cannot be negligible in the evolution of the stress patterns.
基金Funded as a sub-project entitled"Tectonic Patterns of Strong Earthquakes in the Central Asia Continent and Its Dynamic Setting(2008CB425703)"within the project"A Study on the Occurrence Mechanism of the Wenchuan Earthquake and Its Large-scale Regional Dynamic Setting" under the National Key Basic R & D Program (973 Program),China
文摘Based on the collection of active fault slip rate data of large intra-continental shallow thrust earthquakes occurring in the triangular seismic region of the East Asia continent,a preliminary analysis has been performed with results showing that the Wenchuan,Sichuan, China earthquake ( MS = 8.0) of May 12,2008 occurred on the Longmenshan Mountain active fault with an abnormally low slip rate.
