呼永强,李伟. 利用水系类型和GPS数据研究龙日坝断裂带变形模式[J]. 华北地震科学,2021, 39(4):57-62. doi:10.3969/j.issn.1003−1375.2021.04.009.
引用本文: 呼永强,李伟. 利用水系类型和GPS数据研究龙日坝断裂带变形模式[J]. 华北地震科学,2021, 39(4):57-62. doi:10.3969/j.issn.1003−1375.2021.04.009.
HU Yongqiang,LI Wei. Research on the Deformation Pattern of Longriba Fault Zone Using River Drainage Pattern and GPS Data[J]. North China Earthquake Sciences,2021, 39(4):57-62. doi:10.3969/j.issn.1003−1375.2021.04.009.
Citation: HU Yongqiang,LI Wei. Research on the Deformation Pattern of Longriba Fault Zone Using River Drainage Pattern and GPS Data[J]. North China Earthquake Sciences,2021, 39(4):57-62. doi:10.3969/j.issn.1003−1375.2021.04.009.

利用水系类型和GPS数据研究龙日坝断裂带变形模式

Research on the Deformation Pattern of Longriba Fault Zone Using River Drainage Pattern and GPS Data

  • 摘要: 利用arcgis软件提取了龙日坝断裂带地区的汇水流域及其河流,利用Topotoolbox工具计算了汇水流域及河流的方位角和偏转角,并结合GPS运动学数据所揭示的运动学特征,探讨了构造作用对水系类型的控制作用。结果显示,研究区内较大一级汇水流域的形态呈现出顺着块体运动方向由开阔状转狭长状的变化;另外,沿龙日坝断裂带走向分布的17个次级汇水流域的方位角主要分布在0°和350°左右,沿龙日坝断裂带中段(北西盘)的7个次级汇水流域与断层大致斜交,表现出沿着断层走滑方向的系统性偏转和拉长,表明可能受到了断层走滑作用的影响;沿龙日坝断裂带北东段(西盘)的10个次级汇水流域与断层近平行,表明可能受块体运动方向上的挤压应变所主导。

     

    Abstract: This paper uses the Arcgis software to extract the catchment basins and its rivers in the Longriba fault zone, and uses the Topotoolbox tool to calculate the azimuth and deflection angles of the catchment basins and rivers. Combined with the kinematic characteristics revealed by GPS data, we discuss the control effect of tectonic strain on river drainage pattern. The results show that the shape of the larger first-order catchment basin in the study area changes from open to long and narrow along the movement direction of the block. In addition, along the fault zone to the distribution of Longriba fault zone, 17 secondary azimuth of catchment basin are mainly distributed in 0 ° and 350 °. The 7 secondary catchment basins along the middle section of the Longriba fault zone(North-west wall)are roughly oblique to the fault, showing systematic deflection and elongation along the strike-slip direction of the fault, indicating that they may have been affected by the strike-slip. The 10 secondary catchment basins along the north-east section of the Longriba fault zone(West wall)are nearly parallel to the fault, indicating that it may be dominated by the compression strain in the direction of the block movement.

     

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