| 台湾的现代构造地貌及其深部重力机制问题 |
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| 引用本文： | 刘光夏.台湾的现代构造地貌及其深部重力机制问题[J].台湾海峡,1993,12(4):402-406. |
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| 作者姓名： | 刘光夏 |
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| 作者单位： | 国家地震局地球物理勘探大队 郑州，450003 |
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| 基金项目： | 地震科学联合基金资助项目 |
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| 摘 要： | 经过三维重力正演计算，我们从台湾的布格重力异常中求得了深部重力异常，其深度相当于地壳下层。分析对比之后发现，深部重力异常等植线的形态，较好地反映了台湾的现代构造地貌特征。如东部等值线的同步弯曲，犹如错断水系，反映现代板块运动的方向；中部大面积零值和负值线圈闭，反映中央山脉的整体上升；在一些等值线聚合成梯度的地带，又往往是某些深断裂的反映。是否可以这样认为，深部重力异常是地壳深处介质密度沿某一方向的
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| 关 键 词： | 构造地貌学 深部重力机制 台湾 |
Modern tectonic Iandform and its problem of deep gravity mechanism of Taiwan |
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| Liu Guangxia.Modern tectonic Iandform and its problem of deep gravity mechanism of Taiwan[J].Journal of Oceanography In Taiwan Strait,1993,12(4):402-406. |
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| Authors: | Liu Guangxia |
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| Abstract: | By using 3-D gravity forward calculation,we obtained the deep gravity anomalies of Tai-wan from its Bouguer anomaly.Its depth corresponds to the lower crust. Correlation andanalysis results show that the shape of contour lines of the deep gravity anomaly well charac-terizes the modern tectonic landform of taiwan.On the Eastern,Northeastern and Western foothills in Taiwan there are typical offsetstreams and the contour lines of deep gravity anomalies also appear synchronously withbend,reflectiong the dislocation of some faults and the direction of modern plate movementfrom surface to the interiors of the Earth.In the Central Part,the Central Range is an acutelyuplifting area and the contour lines of deep gravity anomaly show regular zero-value and neg-ative value trap.In other regions,the gravity lines show some gradient belts,where someheavily influenced fault zones exist.Perhaps it may be considered that the deep gravity anomaly is the mutation of the densi-ty of the deep crustal media along some directions,and the modern tectonic landform is thesurface revelation of the deep physical properties.This is true in Taiwan that in all the regions where the modern plate tectonic movementis acute,the surfacial landform has its deep geophysical mechanics. |
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| Keywords: | Tectonic landform deep gravity anomaly Bouguer anomaly deep gravity mechanism Taiwan |
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