High Precision 3D P-Wave Velocity Model of the Upper Crust under the Chinese Capital Region Based on Oil Seismic Stack Velocity and Deep Seismic Sounding
详细信息
- 责任者：Yang Feng (Institute of Geophysics ; China Earthquake Administration ; Beijing 100081 ; China) ; Huang Jinli
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(5)
- 关键词：上地壳 ; upper crust ; 地壳结构 ; crustal structure ; 河北 ; Hebei Province
- 页码：p.1487-1496
- 图表：illus., 1 table, 29 refs.
- 分类号：0400
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
We collected oil seismic stack velocities of 40 survey points in the Chinese capital region and processed them to obtain curves which reveal the variations of velocity depend on the depth at each point,digitized 9 profile results of Deep Seismic Sounding(DSS) to get discrete velocities under the each profile,built up high precision 3D P-wave velocity model of the upper crust under the Chinese capital region(115.50°E—117.6°E,38.40°N—40.75°N) by using above data and geologic modeling software.The results show that the North China basin is an area with alternating uplifts and depressions,they are Huanghua depression,Cangxian uplift,Jizhong depression from east to west,and the upper crust velocity structures are quite complex.The depth of crystalline basement varies dramatically under the North China basin.Under the Jizhong depression,the depth of crystalline basement can reach to 10km at the deepest part,and it is deep in the southwest and sallow in the northeast along the structural orientation as a whole.Under the Cangxian uplift,the depth of crystalline basement is about 2~4 km,and under the Huanghua depression,it can reach to 9 km at the deepest part.The great relief of basement indicates the difference of settlement of these three secondary tectonic units and the strong extension tectonic movement since Mesozoic and Cenozoic era.The crystalline basement is shallower under the Taihangshan uplift and Yanshan uplift than under the North China basin,which suggests the raising tectonic movement of uplift area since Cenozoic era.It is the first time to use oil seismic stack velocities on the establishment of the crust velocity model under the Chinese capital region in this study,comparing with models obtained from DSS profiles,our present model are better to reflect the complex upper crust structures under the North China basin.
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