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.
出处
《中国地震》
CSCD
北大核心
2000年第4期342-351,共10页
Earthquake Research in China
基金
国家科技部及中国自然科学基金会"九五"重点科技(攻关 )项目!"伽师强震群区及帕米尔东北侧现代构造运动和地形变的GPS监测研究"资助 (N
