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给出了利用反射波走时重建地壳三维界面的方法 ,并处理了华北地区人工地震测深测线网中的PmP走时资料 ,获得了研究区莫霍界面的三维构造形态 ,确定了壳内深断裂的展布。结果表明 ,研究区莫霍界面埋深整体上由东南向西北加深 ,并在这一背景之上呈现波浪起伏 ,断陷盆地对应上地幔的隆起 ;区内存在数条延伸至莫霍面的地壳深断裂 ,其中大致沿北东走向展布的地壳厚度陡变带和沿北西西向的地壳厚度变异带是区内两条主要的深部构造带。将研究结果与本区中、强地震空间分布特征相结合 ,揭示了地震活动的深部构造背景。
The method to reconstruct the three-dimensional interface of the crust by means of reflected waves is given and the PmP traveltime data in the artificial seismic sounding survey network of North China are processed. The three-dimensional structure of the Moho interface in the study area is obtained, The exhibition. The results show that the burial depth of Moho interface in the study area deepens from southeast to northwest in general, and undulations appear on this background, corresponding to uplift of the upper mantle in fault basins. There are several crusts extending to the Moho in the study area The deep faults, of which the steep change of crustal thickness distributed along the north eastward direction and the crustal thickness variation zone along the northwest-west direction are the two major deep structural belts in the area. Combining the results with the spatial distribution of moderate and strong earthquakes in this area reveals the deep tectonic setting of seismic activity.