本文關(guān)鍵詞：地貌形態(tài)指數(shù)反映的青藏高原東北部宛川河流域新構(gòu)造活動　出處：《地理學(xué)報》2016年03期 　論文類型：期刊論文

  更多相關(guān)文章： 地貌指數(shù) 河流縱剖面 區(qū)域構(gòu)造 斷層 宛川河

【摘要】：宛川河為黃河的一級支流,位于青藏高原東北部的蘭州盆地東部。該區(qū)域歷史時期曾發(fā)生多次6級以上地震。以DEM數(shù)據(jù)為基礎(chǔ),通過河流水系分析和地貌形態(tài)指數(shù)的計算,討論了區(qū)域新構(gòu)造活動特征。山前曲折度指數(shù)(SMF)在宛川河北為1.03~1.18,在興隆山北前緣為1.83~2.88;河谷寬高比指數(shù)(VF)在宛川河北部為0.36~2.34,在南部的興隆山為0.55~13。SMF與VF值的大小和分布特征表明研究區(qū)新構(gòu)造活動活躍,且宛川河以北(前人推測有斷層存在)新構(gòu)造活動的活躍程度更高。流域盆地非對稱性指數(shù)(AF)在宛川河北部東南端的異常揭示存在掀斜斷塊和褶皺運動;結(jié)合裂點分布和溝谷錯斷等地貌特征,發(fā)現(xiàn)宛川河北正斷裂的東南端也存在西北—東南向走滑活動。
[Abstract]:The Wanchuan River is a first-order tributary of the Yellow River, located in the eastern part of Lanzhou Basin in the northeast of the Qinghai-Xizang Plateau. There have been many earthquakes of magnitude 6 or above in the historical period of the region, based on DEM data. Based on the analysis of river system and the calculation of geomorphology index, the characteristics of regional neotectonic activity are discussed. The forward zigzag index (SMF) in Wanchuan and Hebei is 1.03N1.18. In the north front of Xinglong Mountain, 1.83N 2.88; The VF index of the river valley is 0.36 ~ 2.34 in the north of Wanchuan River. The magnitude and distribution of the values of SMF and VF in the southern Xinglong Mountain are 0.55 and 13.The results indicate that the neotectonic activity is active in the study area. Moreover, the activity of neotectonic activity in the north of Wanchuan River (where faults are presumed to exist) is more active. The anomaly of the basin asymmetry index (AFF) in the southeastern end of Wanchuan River reveals the existence of tilting fault blocks and fold movement. According to the geomorphologic features of the fracture point distribution and gully fault, it is found that the northwest to southeast strike-slip activities also exist at the southeast end of the normal fault in Wanchuan.
【作者單位】： 南京大學(xué)地理與海洋科學(xué)學(xué)院;南京大學(xué)地球科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(41522101)~~
【分類號】：P546
【正文快照】： 1引言利用現(xiàn)代地表形態(tài)可反演近地表的構(gòu)造活動過程,如何從現(xiàn)有的地貌形態(tài)中提取相關(guān)的構(gòu)造活動信息是構(gòu)造地貌研究的核心問題�，F(xiàn)代3S技術(shù)的發(fā)展尤其是高分辨率數(shù)字高程模型(DEM)的出現(xiàn),為構(gòu)造地貌的定量化研究提供了新的契機。地貌形態(tài)指數(shù)是對由內(nèi)力作用形成地貌的外在形態(tài)

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本文編號：1390252