海原断裂东段至六盘山断裂西段GPS剖面地壳变形与应变积累分析

利用2004~2013年3期GPS速度场数据，从断裂两侧的水平挤压、拉张与走滑等3方面，对海原断裂东段至六盘山断裂西段GPS剖面变形与应变积累进行研究。结果表明：1)海原断裂东段与六盘山断裂西段在运动方式上具有较强的一致性；2)在近10 a时间尺度上，该活动断裂整体表现为以左旋走滑为主，兼顾压性变化的运动特征，在上、下盘的相对运动差异速率上，走滑方向上达到2.0~5.5 mm/a，断裂垂直方向上约为0.5~3.0 mm/a。

Analysis of the GPS Section Deformation and Strain Accumulation of the Eastern Haiyuan and the Western Liupanshan Faults

This paper analyzes the GPS section deformation and strain accumulation of the Eastern Haiyuan fault and the Western Liupanshan fault with three episodes of GPS velocity field data, recorded between 2007-2013. We undertake a comparative analysis of three properties: compression, tension and slip. The results show that, first, the Eastern Haiyuan fault and the Western Liupanshan fault have the same movement style. Second, in the past 10 years, these active faults’ main campaign feature is mainly a left rotation, and pressure changes are minor. In terms of the relative motion differences rate between the upper and the under plates, the measure range is 2.0-5.5 mm/a in the slip direction, and 0.5-3.0 mm/a in the vertical direction.