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.
出处
《华北地震科学》
1997年第3期18-28,共11页
North China Earthquake Sciences
基金
国家科委"八.五"科技重点项目
关键词
地壳
地幔
壳幔构造
构造研究
地震测深
crustal thickness
M-discontinuity
seismic sounding
mantle structure
