地震工程学报2016，Vol.38Issue(4)：638-646,9.DOI:10.3969/j.issn.1000-0844.2016.04.0638
福建沿海地区流域盆地的面积-高程积分特征及其新构造指示意义
Hypsometric Integral of Drainage Basins in the Coastal Area of Fuj ian and Associated Neotectonic Significance
摘要
Abstract
In this paper,the maj or river system network and drainage basins in the coastal zone of Fujian are extracted based on ASTER GDEM 2 data,and the hypsometric integral (HI)value of the sub-drainage basins is calculated to analyze the response relation between watershed morphol-ogy 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 Zones Ⅰ,Ⅱ,and Ⅲ,in accordance with features of the NW fracture zone and distributional char-acteristics of weak earthquakes in this area.In Zone Ⅰ,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 Zone Ⅱ is represented by the line of Pucheng-Jianyang-Mingxi-Liancheng,indicating that Zone Ⅱ is 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 remark-ably higher HI value in Zone Ⅰ than in Zone Ⅱ;this is obviously higher in the transitional land-form zone towards the inland than in Zone Ⅲ.Zone Ⅲ is 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 distribu-tion of HI values basically coincides with activity attributes of major NE fault zones in this re-gion,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 and the eastward diving process of the Pacific Plate is also fully reflec-ted in the watershed morphology of the coastal zone of Fuj ian.关键词
流域面积-高程积分/新构造活动/福建沿海地区Key words
hypsometric integral/Neotectonic activity/coastal area of Fujian分类
建筑与水利引用本文复制引用
张洁,王少军,梁明剑..福建沿海地区流域盆地的面积-高程积分特征及其新构造指示意义[J].地震工程学报,2016,38(4):638-646,9.基金项目
中国地质调查局“海西经济区遥感地质综合调查”项目(12120114074701) （12120114074701）
