摘要
基于向错-位错组合模型模拟渭河盆地内主要断层的滑动与转动运动变形,通过数值计算获得断层滑动及转动变形引起的地表水平位移,并与盆地内实测GPS水平位移进行了对比。结果表明:采用向错-位错组合模型能够完整地描述断层实际的滑动与转动运动变形状态,组合模型模拟断层滑动与转动引起的地表水平位移与实测GPS水平位移,无论在量级或是运动趋势上均具有较好的一致性特征。
The Weihe Basin,which is situated in the middle of China,was the area of interest for this study.The basin is several hundred kilometers long and forms an S-shape,representing a deep rift that divides China into eastern and western parts.Bounded by the Ordos,North China,and South China blocks,the Weihe Basin is the accommodation zone for the differential motion of these three blocks and also the border and decoupled strip of tectonics between western and eastern China.We simulated the deformation state of the main fault slip and rotation in the Weihe Basin using a combined disclination-dislocation model.The horizontal displacements caused by fault slip and rotation were acquired through numerical calculation and compared with GPS-measured horizontal displacements in the Weihe Basin.The results were as follows.（1）The movements of fault slip and rotation can be described well by the combined disclination-dislocation model,and there are only small differences between the modeling results and monitoring data.（2）Use of only the dislocation model does not adequately describe the activity features of the faults within the Weihe Basin that show slip and rotation,and there are significant differences between the model results and monitoring data,particularly in the direction of crustal movement.（3）Compared to the dislocation model,there is good consistency between the simulated horizontal displacements of the combined model and the measured GPS results.
出处
《地震工程学报》
CSCD
北大核心
2015年第4期996-1000,共5页
China Earthquake Engineering Journal
基金
国家自然科学基金(41374028
41202189
41274005)
中国博士后基金(2013M530412)
中央高校基本科研业务费专项资金(CHD2012TD004
2014G1261050
CHD2014G3263014)
长安大学基础研究支持计划专项基金
关键词
渭河盆地
向错-位错组合模型
断层滑动与转动
水平位移
GPS
Weihe Basin
combined disclination-dislocation model
fault slip and rotation
horizontal displacement
GPS
