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- Title
嘉黎断裂带中段流域地貌形态 指数与新构造活动特征.
- Authors
黄峰; 熊仁伟; 林敬东; 赵峥; 杨攀新
- Abstract
435 tributary basin standardised steepness indices (), 43 tributary valley width-height ra/tio (VF), 55 basin Area-elevation integral index (HI), 10 tributary channel longitudinal profiles and knick points were extracted by using 30 m resolution SRTM DEM data for the middle section of the Jiali Fracture Zone (Niwuxiang-Guxiang). Based on the river steepness indices of different reaches and the distribution characteristics of a series of rift points along the river longitudinal profile, the study area was divided into three areas for comparative analysis: upstream, the south side and the north side of the lower part. The upstream k& and HI were lower than the downstream values, while the VF values were higher than the downstream values. The study resuIts indicated that the tectonic uplift activity in the downstream area of the middle section of the fault was strong, while the uplift in the upstream area was relatively weak. Five tributaries from the north and south were selected respectively for analysis in the downstream part of the Niwuxiang-Guxiang section, and the remote sensing interpreta/tion resuIts showed that the fracture spreads roughly along the southern side of the river valley, and was mostly in the same position as the development of low elevation rift points of the first-order tributaries on the southern side. Combining with the resuIts of the field fracture profile survey and dating resuIt, the analysis suggested that the middle section of the fracture was of early Holocene or la/te Pleistocene age, and was accompanied by significant recoil extrusion in addition to right-slip activity. The reason was that the middle section of the fault was located directly north of the eastern tectonic junction of the Qinghai-Xizang Pla/teau, and it was assumed that in addition to the eastwaxd transport of the Qiangtang block, the recoil is the resuIt of the continuous northward pushing of the tectonic junction.
- Publication
Earthquake (1000-3274), 2024, Vol 44, Issue 1, p1
- ISSN
1000-3274
- Publication type
Article
- DOI
10.12196/j.issn.1000-3274.2024.01.001