文安─蔚县─察右中旗剖面地壳上地幔速度结构与构造研究
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摘要
利用文安～蔚县～察右中旗深地震测深剖面的资料，进行了一维、二维射线追踪走时拟合与合成地震图计算，获得了本区地壳上地幔速度结构。结果表明，地壳上地幔速度结构在纵向和横向上具有明显的不均一性。M面起伏较大，其埋深由冀中拗陷的31．0km向西至山西隆起区北部天镇达42．0km左右。浅部断裂较发育，根据对应其地壳深部界面及速度等值线起伏变化程度和反映断裂带附近各波组特征，推测了地壳深部断裂。
In this paper, 1-D and 2 -D ray tracing traveltime fitting and calculation of synthetic seismograms are performed from DSS data on Wen'an -Yuxian -Qaharyouyizhongqi profile. The velocity structure and tectonics of the crust and upper manttle is determined. The result shows that velocity structure of the crust and upper mantle is obviously inhomgeneous in vertical and lateral directions- M-discontinuity undulates sharply, from a depth of 31km near Baxian in Jizhong depression westward to around 42km at Tianzhen in the north of Shanxi uplift. Shallow faults develop, and deep crustal faults are infered accord ing to the undu1ation of the corresponding deep crustal interfaces, velocity contours and wave group characteristics near the foult zone.
In this paper, 1-D and 2 -D ray tracing traveltime fitting and calculation of synthetic seismograms are performed from DSS data on Wen'an -Yuxian -Qaharyouyizhongqi profile. The velocity structure and tectonics of the crust and upper manttle is determined. The result shows that velocity structure of the crust and upper mantle is obviously inhomgeneous in vertical and lateral directions- M-discontinuity undulates sharply, from a depth of 31km near Baxian in Jizhong depression westward to around 42km at Tianzhen in the north of Shanxi uplift. Shallow faults develop, and deep crustal faults are infered accord ing to the undu1ation of the corresponding deep crustal interfaces, velocity contours and wave group characteristics near the foult zone.
引文
1吴乾著,谢我真,租金华,等.华北地热场研究.中国地震, 1988, 4(1)
2刘国栋,史书林,王宝钩.华北地区壳内高导层及其与地壳构造活动性的关系.中国科学(B辑),1984,(9).
3 Michel B,Hirn A.Velocity-Depth estimation from wide angle seismic reflection arrivals.Annales de Geo physique ,1980,36,(1).
4 Holbrook WS Mooney W D Christersen N I .The seismic velocity structure of the deep continental crust In Continental Lower Crust Developments in Geotectonics 1992,(23)
5 国家地震局地球物理勘探大队译.欧州中部爆破地震研究.地震出版祉,1983.75～134
6 Bodri L,Bodri B.On the correlation between heat flow and crustal thickness Tectonophysics 1985,120,(1/2)
7Fountain D M, Arculus R, hay R W. Continental lower crust. Developments in geotectonlcs(23). The Nether lands:Elsevier Science publishers:1992.45-79
8 刘国栋,刘昌投华北北部地区地壳上地幔构造及其与新生代构造活动的关系.中国科学(B辑),1982,(2)
9王椿镛,王贵美,林中洋,等.用深地震测深方法研究邢台地震区地壳细结构.地球物理学报,1993,36,(4)
10祝治平,张先康,盖玉杰,等.邢台震源区及相邻地区地壳上地慢速度结构研究.地震学报,1995,17,(3)
11曾胜生,张少泉,周海南,等.唐山地区的地壳结构及大陆地震成因的探讨.地震学报,1985,7,(2)
2刘国栋,史书林,王宝钩.华北地区壳内高导层及其与地壳构造活动性的关系.中国科学(B辑),1984,(9).
3 Michel B,Hirn A.Velocity-Depth estimation from wide angle seismic reflection arrivals.Annales de Geo physique ,1980,36,(1).
4 Holbrook WS Mooney W D Christersen N I .The seismic velocity structure of the deep continental crust In Continental Lower Crust Developments in Geotectonics 1992,(23)
5 国家地震局地球物理勘探大队译.欧州中部爆破地震研究.地震出版祉,1983.75～134
6 Bodri L,Bodri B.On the correlation between heat flow and crustal thickness Tectonophysics 1985,120,(1/2)
7Fountain D M, Arculus R, hay R W. Continental lower crust. Developments in geotectonlcs(23). The Nether lands:Elsevier Science publishers:1992.45-79
8 刘国栋,刘昌投华北北部地区地壳上地幔构造及其与新生代构造活动的关系.中国科学(B辑),1982,(2)
9王椿镛,王贵美,林中洋,等.用深地震测深方法研究邢台地震区地壳细结构.地球物理学报,1993,36,(4)
10祝治平,张先康,盖玉杰,等.邢台震源区及相邻地区地壳上地慢速度结构研究.地震学报,1995,17,(3)
11曾胜生,张少泉,周海南,等.唐山地区的地壳结构及大陆地震成因的探讨.地震学报,1985,7,(2)
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