【摘要】 综合基础地理信息数据、数字化地质图、沉积层的地脉动探测结果、人工地震测深和宽角折射等多种资料,在对数据进行分析和整理的基础上,利用建模工具软件GoCAD,建立了北京地区(东经115.5°—117.5°,北纬39°—41°)地壳及上地幔顶部P波速度结构和地质界面模型。在模型建立的过程中,分析得到了人工地震剖面数据的地学统计特性,并设计了一种适合离散光滑插值(DSI)约束点权重的光滑估计方差,对模型的插值结果进行了质量评估。分析了北京地区地壳上地幔速度结构的特征,又将速度结构模型与层析成像结果进行对比,模型比较好地反映了北京地区的地下结构。更多还原

【Abstract】 A 3-D structure model covering the crust and the top of upper mantel P-wave velocity and geological boundaries of Beijing area (115.5°—117.5°E,39°—41°N) has been built up using GoCAD, with data from GIS, numeric geological maps, micro-tremor measurements and wide-angel refraction/ reflection Deep Seismic Sounding (DSS) profiles. Using statistics tool we analyzed the geological character of DSS profiles applied in our model, and designed a new kind of Smooth Estimate Variation, which is suitable to the constraint weight of Discrete Smooth Interpolation (DSI), to estimate the quality of interpolations in the modeling. By analyzing characters of the crust and the top of upper mantel P-wave velocity and comparing our model with seismic tomography results, we conclude out that our model is good in embodying the structure characters nether Beijing area.更多还原