热水——日月山断裂带遥感特征初步探讨
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摘要
热水—日月山断裂带在遥感影像上具有明显的线性构造特征,通过解译认为该断裂带由6条不连续的断裂段右阶羽列组成,活动特征很明显,造成一系列水系断错,最大水平位错940 m,并沿断裂带形成一系列小拉分盆地,认为该断裂带具有较强的右旋走滑特征。其中牧场部—大崖根段北西西向沿湟水河河谷发育,除其本身具有发生强震的构造能力外,其延伸是否与西宁市区中的沿湟水河谷地附近的地表断层相连,对西宁盆地的构造活动形式及地震构造特征有十分重要的意义。历史地震表明曾在热水煤矿与大通山构造复合部位于1927年连续发生多次M4.5～5.5级中强地震。
Reshui-Riyue mountain fault zone has obvious linear structural characteristics in remote sensing image.The fracture zone constructed by six dextral slip order plume discontinuous fracture sections and clear activity features by the interpretation,and it caused a series of offset in water system,the maximum horizontal dislocation is 940 m along the fault.At the same time,it formed a series of small pull-apart basins,and the fault has strong dextral strike-slip feature.The direction of ranch department to Daya root fault along Huangshui River Valley is NWW,in addition to its strong earthquakes tectonic capacity,whether the fault extended to Xining basin,and the tectonic activity patterns and structural characteristics of earthquakes are very important.Historical earthquake research show that tectonic complex located in the department of Reshui coal mine to Datong mountain had consecutive occurred multiple M4.5~5.5 moderately strong earthquakes in 1927.
Reshui-Riyue mountain fault zone has obvious linear structural characteristics in remote sensing image.The fracture zone constructed by six dextral slip order plume discontinuous fracture sections and clear activity features by the interpretation,and it caused a series of offset in water system,the maximum horizontal dislocation is 940 m along the fault.At the same time,it formed a series of small pull-apart basins,and the fault has strong dextral strike-slip feature.The direction of ranch department to Daya root fault along Huangshui River Valley is NWW,in addition to its strong earthquakes tectonic capacity,whether the fault extended to Xining basin,and the tectonic activity patterns and structural characteristics of earthquakes are very important.Historical earthquake research show that tectonic complex located in the department of Reshui coal mine to Datong mountain had consecutive occurred multiple M4.5~5.5 moderately strong earthquakes in 1927.
引文
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[2]李智敏,田勤俭,姚生海,等.青海大通断裂带初步研究[J].地震地质,2007,29(4):856-862.
[3]田勤俭,李智敏,张军龙,等.西宁市活断层地震构造模型初步研究[J].地震地质,2007,29(2):311-319.
[4]田勤俭,丁国瑜,申旭辉.青藏高原东北隅强震构造模型[J].地震,2002,22(1):9-16.
[5]滕瑞增,金瑶泉,李西侯,等.西秦岭北缘断裂带新活动特征[J].西北地震学报,1994,16(2):85-90.
[6]王二七,张旗.青海拉脊山:一个多阶段抬升的构造窗[J].地质科学,2000,35(4):493-500.
[7]Metivier F,Gaudemer Y,Tapponnier P,et al.North-eastward growth of the Tibet Plateau deduced from bal-anced reconstruction of two depositional areas:The Cai-dam and Hexi Corridor basins,China[J].Tectonics,1998,17(6):823-842.
[8]Tapponnier P,XU Zhiqin,Roger F,et al.Obliquestepwise rise and growth of the Tibet Plateau[J].Sci-ence,2001,294(23):1 671-1 677.
[9]袁道阳,刘小龙,刘百篪,等.青海热水—日月山断裂带古地震的初步研究[J].西北地震学报,2003,25(2):42-48.
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