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The vP Velocity Structures of Sub-blocks in the North China Craton from Active Source Waveform Modeling and Tectonic Implications
LIU Hanqi1, TIAN Xiaofeng1, LIU Baofeng1, WANG Honglei2
1.Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450003, China;2.Hebei Earthquake Agency, Shijiazhuang 050021, China
摘要:
We present the 1-D crustal velocity structure of the major tectonic blocks of the North China Craton (NCC) along 36°N based on synthetic seismogram modeling of long-range wide-angle reflection/refraction data. This profile extends from southwest Yan'an of central Shaanxi Province of China (109.47°E), across the southern Trans-North China Orogen (TNCO), the southwestern part of the North China Plain (NCP), the Luxi Uplift (LU) and the Sulu Orogen (SLO), ending at Qingdao City of Shandong Province, the eastern margin of China (120.12°E) along 36°N. We utilized reflectivity synthetic seismogram modeling of the active source data to develop 1-D velocity structures of the sub-blocks of the NCC. Our final model shows that the NCC crust varies remarkably among the tectonic units with different velocity structure features. Higher lower crustal velocity and Moho depth~42km is a major feature of the crust beneath southern Ordos Blockt. The TNCO which is composed of Lyuliangshan Mountains (LM), Shanxi Graben (SXG) and Taihangshan Mountains (TM) shows dominant trans-orogenic features. The NCP shows a dominant thickening of sediments, sharp crust thinning with Moho depth~32km and significant lower average velocity. The SLO and the LU shows a stratified crust, higher average velocity and crust thinning with Moho depth of~35km. Our model shows the coincidence between the deep structure and the surface geology among all the tectonic sub-blocks of the NCC.
关键词:  The North China Craton  Crustal velocity structure  Craton destructure  Wide-angle reflection/refraction
DOI:10.19743/j.cnki.0891-4176.201902009
分类号:
基金项目:This project sponsored by the National Natural Science Foudation of China (NSFC) (41574084 and 41774071).
The vP Velocity Structures of Sub-blocks in the North China Craton from Active Source Waveform Modeling and Tectonic Implications
LIU Hanqi1, TIAN Xiaofeng1, LIU Baofeng1, WANG Honglei2
1.Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450003, China;2.Hebei Earthquake Agency, Shijiazhuang 050021, China
Abstract:
We present the 1-D crustal velocity structure of the major tectonic blocks of the North China Craton (NCC) along 36°N based on synthetic seismogram modeling of long-range wide-angle reflection/refraction data. This profile extends from southwest Yan'an of central Shaanxi Province of China (109.47°E), across the southern Trans-North China Orogen (TNCO), the southwestern part of the North China Plain (NCP), the Luxi Uplift (LU) and the Sulu Orogen (SLO), ending at Qingdao City of Shandong Province, the eastern margin of China (120.12°E) along 36°N. We utilized reflectivity synthetic seismogram modeling of the active source data to develop 1-D velocity structures of the sub-blocks of the NCC. Our final model shows that the NCC crust varies remarkably among the tectonic units with different velocity structure features. Higher lower crustal velocity and Moho depth~42km is a major feature of the crust beneath southern Ordos Blockt. The TNCO which is composed of Lyuliangshan Mountains (LM), Shanxi Graben (SXG) and Taihangshan Mountains (TM) shows dominant trans-orogenic features. The NCP shows a dominant thickening of sediments, sharp crust thinning with Moho depth~32km and significant lower average velocity. The SLO and the LU shows a stratified crust, higher average velocity and crust thinning with Moho depth of~35km. Our model shows the coincidence between the deep structure and the surface geology among all the tectonic sub-blocks of the NCC.
Key words:  The North China Craton  Crustal velocity structure  Craton destructure  Wide-angle reflection/refraction