【摘要】 在"中国地壳运动观测网络"已有站点的基础上,沿甘肃兰州至宁夏中卫一线布设了一条由12个站点构成的跨青藏高原东北缘断裂带的GPS测线网。该测线网与已有站点相互补充,构成了一条平均点距约22km的密集GPS跨断裂剖面,为青藏高原东北缘海原断裂带及香山-天景山断裂带的现今走滑及逆冲运动状况进行更加精细的研究提供有效的约束。阐述该GPS测线网的站点布设情况、各观测组未必同步的"自由观测方式"、先进的GIPSY软件"精确单点定位"数据处理方案,并对观测结果进行分析。实测结果表明,这种方案能够在确保精度要求的前提下更加有效、灵活地实施GPS的地壳形变监测。更多还原

【Abstract】 Based on the existing regional GPS network of Crustal Movement Observation Network of China (CMONOC), a GPS profile across the fault zones of northeast margin of Tibetan Plateau is established. The profile, extended from Lanzhou, Gansu to Zhongwei, Ningxia, is composed of 12 stations. These new stations, together with the existing GPS stations, construct a spatially dense profile whose average interval of the stations is about 22 km. This profile provides effective restriction for investigating the present-day movement characteristics of Haiyuan and Xiangshan-Tianjingshan active fault zones in detail. The stations distribution of GPS profile is introduced. A "nonsynchronous observation method" in GPS observations, which allows a flexible observation schedule for each team, is proposed. The strategy of "Precise Point Positioning" of GIPSY software is used and the data processing results of the GPS profile are analyzed. The practical results show that the adopted scheme, "nonsynchronous observation method" and "Precise Point Positioning" data processing strategy, can effectively observe crustal deformation with satisfying accuracy.更多还原