摘要
基于ASTER GDEM V2数据,提取福建沿海地区主要的水系网络和流域盆地,计算亚流域盆地的面积-高程积分值(HI值),以分析区内流域地貌与新构造运动的响应关系。结果表明,HI值从沿海向内陆呈条带状逐渐递减,与本区NW向主要断裂带的活动特征和小震活动分布特征具有较好的一致性,这也可能是区内向内陆地区方向受到台湾岛动力触角的影响逐渐减弱的原因。同时南海盆地打开的裂谷扩张和太平洋板块向东俯冲过程的博弈结果在福建沿海地区的流域地貌中也得到了比较充分的反映。
In this paper,the major river system network and drainage basins in the coastal zone of Fujian are extracted based on ASTER GDEM 2data,and the hypsometric integral（HI）value of the sub-drainage basins is calculated to analyze the response relation between watershed morphology and Neotectonic activities in the area of analysis.Results show the HI value to be distributed in evident bands,where it tends to gradually reduce from the coast to inland in areas divided into ZonesⅠ,Ⅱ,and Ⅲ,in accordance with features of the NW fracture zone and distributional characteristics of weak earthquakes in this area.In ZoneⅠ,regions such as Fuzhou and Fu＇an have a low HI value because they are costal basins characterized by basinal deposits and partial tectonic descents.The western boundary of ZoneⅡis represented by the line of Pucheng-Jianyang-MingxiLiancheng,indicating that ZoneⅡis basically situated between the Zhenghe—Dapu fault zone on the east side and the Shaowu-Heyuan fault zone on the west side.Observations of vertical modern crust deformation indicate an obvious differential uplift on both sides of the Zhenghe—Dapu fault zone,with a higher uplifting amplitude in the east than the west,which is a reflected by a remarkably higher HI value in ZoneⅠthan in ZoneⅡ;this is obviously higher in the transitional landform zone towards the inland than in Zone Ⅲ.Zone Ⅲis mainly situated in the area west of the Pucheng—Jianyang—Mingxi—Liancheng line,where the HI value has a well-marked low-value anomaly,which may reflect relatively weak tectonic movement in the region and a relatively light influence from coastal tectonic deformation as it is situated far from the coastal zone.The distribution of HI values basically coincides with activity attributes of major NE fault zones in this region,which may be caused by the gradually weakening influence of dynamic antennas on Taiwan Island towards the inland area.In addition,the conflict between expansion of the open rift valley in the South China Sea Basin a
出处
《地震工程学报》
CSCD
北大核心
2016年第4期638-646,共9页
China Earthquake Engineering Journal
基金
中国地质调查局"海西经济区遥感地质综合调查"项目(12120114074701)
