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基于合成速率法的青藏块体东北缘断裂活动分析
唐红涛1, 张学刚2, 高子让3, 丁国丽4, 李瑞莎1
1.中国地震局第二监测中心, 西安 710054;2.青海省测绘质量监督检验中心, 西宁 810001;3.湖南省第二测绘院, 长沙 410118;4.国家测绘地理信息局第一航测遥感院, 西安 710054
摘要:
基于合成速率法、趋势累积率法与跨断层资料等的结合,从时空的不同角度分析了青藏块体东北缘主要断裂应变积累的运动特征。结果显示:①2010~2016年,祁连山断裂带呈微弱拉张的运动态势,海原断裂带由张转压,六盘山断裂带在门源地震前显示张性运动,震后发生转折;②长期来看,基于趋势累积率Dc的计算结果显示了祁连山断裂带中、西段累积应变略高于东段,从量值上看整个青藏块体东北缘Dc高值区位于六盘山断裂带附近。
关键词:  合成速率  趋势累积率  跨断层  青藏块体东北缘  断裂
DOI:
分类号:P315
基金项目:中国综合地球物理场观测大华北地区项目(201508009)、中国地震局地震科技星火计划项目(XH17062Y)共同资助
The Fracture Activity Analysis of the Northeast Margin of Qinghai-Tibetan Block Based on the Synthetic Rate Method
Tang Hongtao1, Zhang Xuegang2, Gao Zirang3, Ding Guoli4, Li Ruisha1
1.The Second Monitoring and Application Center, CEA, Xi'an 710054, China;2.Qinghai Surveying and Mapping Quality Supervision and Inspection Center, Xining 810001, China;3.Hunan Second Surveying and Mapping Institute, Changsha 410118, China;4.The First Institute of Aerial Surveying and Remote Sensing, National Bureau of Surveying, Mapping and Geographic Information, Xi'an 710054, China
Abstract:
Based on the combination of the synthetic rate,the trend accumulation rate method and the cross-fault data,this paper analyzes the movement characteristics of the main fault strain accumulation in the northeastern margin of the Qinghai-Tibetan Block from different angles of time and space. The result shows that:(1)In the short term,the movement situation of the Qilianshan fault zone is weak. The movement characteristics of the Haiyuan fault is from extension to extrusion. Before the Menyuan earthquake,the movement characteristics of the Liupanshan fault is extension,and has a turning point.(2)In the long run,the calculation results based on trend accumulation rate show that the cumulative strain of the middle west of Qilianshan Fault zone is slightly higher than the East. From the numerical value about the northeast margin of Qinghai-Tibetan Block,the Dc high value region is near the Liupanshan faults.
Key words:  Synthetic rate  Trend accumulation rate  Cross-fault  Northeast Margin of Qinghai-Tibetan Block  Fault