关键词: 地壳形变, GPS观测, 数据处理, 青藏高原

Abstract: In order to investigate the present-day movement characteristics of Haiyuan active fault zone and Xiangshan-Tianjingshan active fault zone on the northeast margin of Tibetan Plateau in detail, we established a GPS profile across the fault zones. The profile, extending from Lanzhou, Gansu to Zhongwei, Ningxia, is composed of 12 stations and locally reinforced the existing regional GPS network of Crustal Movement Observation Network of China (CMONOC). These new stations, together with the existing GPS stations, constructed a spatially dense profile whose average interval of the stauions is ~22km. Considering that there were two continuous GPS stations of CMONOC (i.e. XNIN and YANG) around the region, we tried a “Flexible Observation Method” in GPS observations. The method allows non-synchronal observations for all the GPS observation teams and makes the observation schedule rather flexible. In data processing, we used the advanced strategy of “Precise Point Positioning” of GIPSY software. Our result shows that with the support of CMONOC, especially the continuously observed fiducial GPS network of CMONOC, we can use the “Flexible Observation Method” and “Precise Point Positioning” data processing strategy to effectively observe local GPS networks to monitor crustal deformation with satisfying accuracy.

Key words: crustal deformation, GPS observation, data processing, Tibetan Plateau