基于遥感技术研究萧山—球川断裂带
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摘要
遥感影像不仅从宏观上展现了活动断裂与其它活动构造的影像全貌,而且直观地揭示了活动断裂的影像信息,为分析断裂的活动状态及其与地震活动的相关性,识别发震构造与强震的孕育地段提供了丰富的信息。本文以萧山—球川断裂为例,在地质地貌特征上进行了详细的分析,揭示其几何学和运动学特征。采用图像增强与融合等处理方法,增加了图像的立体感,提高了遥感影像清晰度和解译精度。研究表明:NE向的萧山—球川断裂是杭州地区规模最大的断裂,它既具有早期左旋挤压剪切的特点,同时还具有后期右旋张扭的运动特征,表明该断裂带在各个地段和各个时期表现形式截然不同,对杭州地区古生代以来的地层沉积和构造演化有着直接的控制作用,形成了断裂两侧不同的地层与地貌特征。本次研究成果将对杭州地区大型工程建设、城市规划以及新构造运动的研究有一定的借鉴意义。
Remote sensing image not only expresses the panorama of active faults and active tectonics on macroscopic view,but exposes the image information of active faults directly.It offers profuse information for analysing the active states of faults,their correlation with seismicity,the tectonics developing earthquakes and strong earthquake preparation.In this paper,we take Xiaoshan-Qiuchuan Faults as an example,the detailed rupture character is analyzed from a viewpoint of geological and topographic features,and the fault geometry and kinematics characteristics are revealed.Remote sensing image definition and precision were greatly improved by image enhancements and fusions.The result shows that Xiaoshan-Qiuchuan Faults which is of NE-direction are the largest faults in Hangzhou area with different form in different segment and time,not only have left-revolve extrusive shear characteristic early,but right-revolve wrenched movement characteristic later.It has controlled sedimentary strata and tectonic evolution since Paleozoic and formed different stratum and topographic features.The result will offer significance to large engineering project、city planning and study of neotectonies.
Remote sensing image not only expresses the panorama of active faults and active tectonics on macroscopic view,but exposes the image information of active faults directly.It offers profuse information for analysing the active states of faults,their correlation with seismicity,the tectonics developing earthquakes and strong earthquake preparation.In this paper,we take Xiaoshan-Qiuchuan Faults as an example,the detailed rupture character is analyzed from a viewpoint of geological and topographic features,and the fault geometry and kinematics characteristics are revealed.Remote sensing image definition and precision were greatly improved by image enhancements and fusions.The result shows that Xiaoshan-Qiuchuan Faults which is of NE-direction are the largest faults in Hangzhou area with different form in different segment and time,not only have left-revolve extrusive shear characteristic early,but right-revolve wrenched movement characteristic later.It has controlled sedimentary strata and tectonic evolution since Paleozoic and formed different stratum and topographic features.The result will offer significance to large engineering project、city planning and study of neotectonies.
引文
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[2]邓起东,徐锡伟,张先康等.城市活动断裂探测的方法和技术[J].地学前缘,2003,10(1):93 104.
[3]叶建青.城市活断层研究与浙江省的城市化建设[J].上海地质,2001,4:31 33.
[4]DENG Qindong,FENG Xianyue,ZHANG Peizhan,etal.Active reverse fault-fold zones and earthquakes a-long northern Tianshan,Xinjiang,China[J].Seis-mology and Geology,1996,18(Suppl):21 37.
[5]赵冬,叶建青,马志江,等.萧山—球川断裂(富阳—盐官段)活动性研究[M].杭州:浙江省工程地质研究所.2004.
[6]FUIS G S,RYBERG T,GODEFREG N J,et al.Crustal structure and tectonics from the Los AngelesBasin to the Mojave Desert,Southern California[J].Geology,2001,29(1):15 18.
[7]张景发,陶夏新,田云峰,等.城市周边活断层探测中遥感技术的应用[J].自然灾害学报,2004,13(1):137145.
[8]章孝灿,黄智才,赵元洪.遥感数字图像处理[M].杭州:浙江大学出版社,1997.
[9]齐跃明,陈启国.安徽南部东西向断裂构造的遥感研究[J].西部探矿工程,2003,11:77 79.
[10]李长江,王永江,沈晓华,等.浙江省国土资源遥感调查与综合研究[M].北京:地质出版社,2004.
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