We obtain the preliminary result of crustal deformation velocity field for the Chinese con-tinent by analyzing GPS data from the Crustal Motion Observation Network of China (CMONOC), particularly the data from the reg...We obtain the preliminary result of crustal deformation velocity field for the Chinese con-tinent by analyzing GPS data from the Crustal Motion Observation Network of China (CMONOC), particularly the data from the regional networks of CMONOC observed in 1999 and 2001. We de-lineate 9 tectonically active blocks and 2 broadly distributed deformation zones out of a denseGPS velocity field, and derive block motion Euler poles for the blocks and their relative motionrates. Our result reveals that there are 3 categories of deformation patterns in the Chinese conti-nent. The first category, associated with the interior of the Tibetan Plateau and the Tianshan oro-genic belt, shows broadly distributed deformation within the regions. The third category, associatedwith the Tarim Basin and the region east of the north-south seismic belt of China, shows block-likemotion, with deformation accommodated along the block boundaries only. The second category, mainly associated with the borderland of the Tibetan Plateau, such as the Qaidam, Qilian, Xining(in eastern Qinghai), and the Diamond-shaped (in western Sichuan and Yunnan) blocks, has thedeformation pattern between the first and the third, i.e. these regions appear to deform block-like,but with smaller sizes and less strength for the blocks. Based on the analysis of the lithosphericstructures and the deformation patterns of the regions above, we come to the inference that thedeformation modes of the Chinese continental crust are mainly controlled by the crustal structure.The crust of the eastern China and the Tarim Basin is mechanically strong, and its deformationtakes the form of relative motion between rigid blocks. On the other hand, the northward indentation of the Indian plate into the Asia continent has created the uplift of the Tibetan Plateau and the Tianshan Mountains, thickened their crust, and raised the temperature in the crust. The lower crust thus has become ductile, evidenced in low seismic velocity and high electric conductivity observed. The brittle part of t展开更多
1997年底,国家重大科学工程——中国地壳运动观测网络(Crustal Movement Obser-vation Network of China,缩写为CMONOC)开始建设,整个工程在2000年底建成。中国地壳运动观测网络以监测地壳运动服务于地震预测预报为主要目标,同时兼顾大...1997年底,国家重大科学工程——中国地壳运动观测网络(Crustal Movement Obser-vation Network of China,缩写为CMONOC)开始建设,整个工程在2000年底建成。中国地壳运动观测网络以监测地壳运动服务于地震预测预报为主要目标,同时兼顾大地测量和国防建设的需要。该工程由中国地震局、总参测绘局、中国科学院、国家测绘局共同承担,包括基准网、基本网、区域网、数据传输与处理分析系统四大部分。 中国地壳运动观测网络以全球卫星定位系统(GPS)观测技术为主,辅之甚长基线射电干涉测量(VLBI)和人卫激光测距(SIR)等空间技术,结合精密重力和精密水准测量,构成大范围、高精度、高时空分辩率的地壳运动监测系统。这是一个综合性、多用途、开放型、数据资源共享、全国统一的观测网络,具有连续动态监测功能。网络将从根本上改善中国对地球表层固、液、气三个圈层的动态监测方式。展开更多
文摘We obtain the preliminary result of crustal deformation velocity field for the Chinese con-tinent by analyzing GPS data from the Crustal Motion Observation Network of China (CMONOC), particularly the data from the regional networks of CMONOC observed in 1999 and 2001. We de-lineate 9 tectonically active blocks and 2 broadly distributed deformation zones out of a denseGPS velocity field, and derive block motion Euler poles for the blocks and their relative motionrates. Our result reveals that there are 3 categories of deformation patterns in the Chinese conti-nent. The first category, associated with the interior of the Tibetan Plateau and the Tianshan oro-genic belt, shows broadly distributed deformation within the regions. The third category, associatedwith the Tarim Basin and the region east of the north-south seismic belt of China, shows block-likemotion, with deformation accommodated along the block boundaries only. The second category, mainly associated with the borderland of the Tibetan Plateau, such as the Qaidam, Qilian, Xining(in eastern Qinghai), and the Diamond-shaped (in western Sichuan and Yunnan) blocks, has thedeformation pattern between the first and the third, i.e. these regions appear to deform block-like,but with smaller sizes and less strength for the blocks. Based on the analysis of the lithosphericstructures and the deformation patterns of the regions above, we come to the inference that thedeformation modes of the Chinese continental crust are mainly controlled by the crustal structure.The crust of the eastern China and the Tarim Basin is mechanically strong, and its deformationtakes the form of relative motion between rigid blocks. On the other hand, the northward indentation of the Indian plate into the Asia continent has created the uplift of the Tibetan Plateau and the Tianshan Mountains, thickened their crust, and raised the temperature in the crust. The lower crust thus has become ductile, evidenced in low seismic velocity and high electric conductivity observed. The brittle part of t
文摘1997年底,国家重大科学工程——中国地壳运动观测网络(Crustal Movement Obser-vation Network of China,缩写为CMONOC)开始建设,整个工程在2000年底建成。中国地壳运动观测网络以监测地壳运动服务于地震预测预报为主要目标,同时兼顾大地测量和国防建设的需要。该工程由中国地震局、总参测绘局、中国科学院、国家测绘局共同承担,包括基准网、基本网、区域网、数据传输与处理分析系统四大部分。 中国地壳运动观测网络以全球卫星定位系统(GPS)观测技术为主,辅之甚长基线射电干涉测量(VLBI)和人卫激光测距(SIR)等空间技术,结合精密重力和精密水准测量,构成大范围、高精度、高时空分辩率的地壳运动监测系统。这是一个综合性、多用途、开放型、数据资源共享、全国统一的观测网络,具有连续动态监测功能。网络将从根本上改善中国对地球表层固、液、气三个圈层的动态监测方式。
