新疆帕米尔东北侧地区现今地壳运动的GPS监测研究
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摘要
通过加密帕米尔东北侧地区的GPS监测网并进行复测 ,结合周边地区的IGS站数据 ,计算得到了该地区 4 0多个GPS点位运动速率 ,由此得到了该地区的现今地壳形变速率图及GPS基准站的时间序列。结果表明 :各GPS站主要运动方向为北北西 ,基本上与天山褶皱带走向正交 ,即形成对天山的正向挤压。伽师附近及其西南区的运动形态与周邻测站有所不同 ,表明伽师地区的构造变形与近几年地震活动有某种关联。环塔里木盆地周边点在各区内的速率变化较小 ,方向也基本一致 ,说明塔里木盆地内部变形较小或基本不变形。
The present day crustal deformation velocity map composed of motion rates of more than 40 GPS stations and time series of GPS fiducial stations are derived by a densification of GPS network and repeated observations in the northeast Pamir. All the GPS stations move toward Tianshan mainly in NNW direction which is basically perpendicular to Tianshan fold belt, implying a push to Tianshan along a direction to the north. the crustal motion at GPS sites nearby Jiashi and southwest of Jiashi is different from that of its surroundings, implying the link between current deformation and Jiashi earthquakes in the past several years. The velocity change among GPS station surrounding Tarim basin is small and the direction is similar, which indicates the internal deformation within Tarim basin is much small or no deformation at all.
The present day crustal deformation velocity map composed of motion rates of more than 40 GPS stations and time series of GPS fiducial stations are derived by a densification of GPS network and repeated observations in the northeast Pamir. All the GPS stations move toward Tianshan mainly in NNW direction which is basically perpendicular to Tianshan fold belt, implying a push to Tianshan along a direction to the north. the crustal motion at GPS sites nearby Jiashi and southwest of Jiashi is different from that of its surroundings, implying the link between current deformation and Jiashi earthquakes in the past several years. The velocity change among GPS station surrounding Tarim basin is small and the direction is similar, which indicates the internal deformation within Tarim basin is much small or no deformation at all.
引文
白超英、王莜荣 ,1999,1997年新疆伽师强震群序列活动特征 ,华南地震 ,19(1) ,2 3～ 30。
党亚民、陈俊勇、刘经南、葛茂荣 ,1998,利用国家A级网资料对中国大陆现今水平形变场的初步分析 ,测绘学报 ,2 7(3) ,2 6 7～ 2 73。
游新兆、王 琪、乔学军 ,1998,中国大陆地壳运动GPS监测网 ,地壳形变与地震 ,1998,18(增刊 ) ,12 8～ 136。
乔学军、王 琪、游新兆、沈春琳 ,1998,中国GPS地壳运动监测网的精度分析与评定 (1992～ 1996 ) ,地壳形变与地震 ,18(1) ,5 2～ 5 6。
胥 颐、刘福田、刘建华、孙若昧 ,2 0 0 0 ,天山地震带的地壳结构与强震构造环境 ,地球物理学报 ,43(2 ) ,184～ 192。
周硕愚、张跃刚、丁国瑜、吴 云、秦晓军、施顺英、王 琪、游新兆、乔学军、帅 平、邓干金 ,1998,依据GPS数据建立中国大陆板内块体现时运动模型的初步研究 ,地震学报 ,2 0 (4 ) ,347～ 35 5。
王 琪、游新兆、乔学军 ,1998,GPS测地综合分析软件系统 (GSAIS) ,地壳形变与地震 ,18(增 ) ,88～ 93。
AvouacJ .P .,P .Tapponnier ,1993.KinematicmodelofactivedeformationincentralAsia ,Geophys.Res .Lett ,2 0 :895～898.
党亚民、陈俊勇、刘经南、葛茂荣 ,1998,利用国家A级网资料对中国大陆现今水平形变场的初步分析 ,测绘学报 ,2 7(3) ,2 6 7～ 2 73。
游新兆、王 琪、乔学军 ,1998,中国大陆地壳运动GPS监测网 ,地壳形变与地震 ,1998,18(增刊 ) ,12 8～ 136。
乔学军、王 琪、游新兆、沈春琳 ,1998,中国GPS地壳运动监测网的精度分析与评定 (1992～ 1996 ) ,地壳形变与地震 ,18(1) ,5 2～ 5 6。
胥 颐、刘福田、刘建华、孙若昧 ,2 0 0 0 ,天山地震带的地壳结构与强震构造环境 ,地球物理学报 ,43(2 ) ,184～ 192。
周硕愚、张跃刚、丁国瑜、吴 云、秦晓军、施顺英、王 琪、游新兆、乔学军、帅 平、邓干金 ,1998,依据GPS数据建立中国大陆板内块体现时运动模型的初步研究 ,地震学报 ,2 0 (4 ) ,347～ 35 5。
王 琪、游新兆、乔学军 ,1998,GPS测地综合分析软件系统 (GSAIS) ,地壳形变与地震 ,18(增 ) ,88～ 93。
AvouacJ .P .,P .Tapponnier ,1993.KinematicmodelofactivedeformationincentralAsia ,Geophys.Res .Lett ,2 0 :895～898.
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