利用GRACE、GPS和水准数据研究西秦岭地区现今地壳垂直运动特征

发布时间：2018-04-06 21:01

本文选题：西秦岭　切入点：GRACE　出处：《大地测量与地球动力学》2017年10期

【摘要】：利用GRACE卫星数据改正GPS连续站垂向位移时间序列中的周期变化,用主成分分析方法消除区域共模噪声误差,计算获取西秦岭地区GPS连续站的垂直运动速率,并将其作为速率参考基准,联合水准观测资料基于线性动态平差模型,处理得到西秦岭地区现今地壳垂直运动速度场。结果显示,西秦岭整体处于差异性的快速隆升,主要是由青藏高原东北缘的地壳缩短作用所致。六盘山和天水南侧均以3mm/a速率抬升,是本区上升最快的地方;其次是陇西地块和鄂尔多斯地块南部,分别以2mm/a和1mm/a的速率上升;秦岭造山带和渭河盆地的西部表现为下沉,但渭河盆地下沉最快。西秦岭现今地壳垂直运动可能暗示青藏高原东北缘的现今横向逃逸运动通道已从早期的西秦岭-秦岭地块向北转移到六盘山构造带、鄂尔多斯地块南部。
[Abstract]:Using the GRACE satellite data to correct the periodic variation in the vertical displacement time series of the GPS continuous station, to eliminate the regional common-mode noise error by using the principal component analysis method, and to calculate the vertical motion rate of the GPS continuous station in the West Qinling region.The velocity field of the present crustal vertical movement in the West Qinling region is obtained by using the combined leveling data based on the linear dynamic adjustment model.The results show that the rapid uplift of the western Qinling is mainly caused by the shortening of the crust in the northeastern margin of the Qinghai-Tibet Plateau.But the Weihe basin sinks fastest.The present vertical crustal movement in the West Qinling Mountains may indicate that the current lateral escape channel in the northeastern margin of the Qinghai-Xizang Plateau has shifted from the early West Qinling-Qinling Block to the Liupanshan tectonic belt, south of the Ordos block.
【作者单位】：中国地震局第二监测中心;
【基金】：国家自然科学基金(41590860) 中国地震局地震科技星火计划(XH15064Y)~~
【分类号】：P22;P315.7

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