跨地震带GPS剖面线观测与数据分析
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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。
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.
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.
引文
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Wang Q,Zhang P Z,Freymueller TJ,et al.2001.Present-day crustaldeformation in China constrained by Global Positioning System meas-urements[J].Science,(294):574-577.
Zumberge J F,Heflin M B,Jefferson D C,et al.1997.Precise pointpositioning for the efficient and robust analysis of GPS data from largenetworks[J].J.Geophys.Res.,(102):5005-5017.
甘卫军,沈正康,张培震,等.2004.青藏高原地壳水平差异运动的GPS观测研究[J].大地测量与地球动力学,24(1):29-35.
国家地震局质研究所.1990.海原活动断裂带[M].北京:地震出版社.
李铁明,邓志辉,吕弋培,等.2003.鲜水河断裂带北段GPS测量及其运动特征[J].西北地震学报,25(4):312-318.
李延兴,郭良迁.2002.云南中北部地区水平形变应变场研究[J].中国地震,18(2):141-147.
王晓强,王琪,程瑞忠,等.2002.新疆伽师及邻近地区现今地壳形变的GPS监测与研究[J].西北地震学报,24(3):199-207.
张培震,王琪,马宗晋.2002.中国大陆现今构造运动的GPS速度场与活动地块[J].地学前缘,9(2):430-441.
Wang Q,Zhang P Z,Freymueller TJ,et al.2001.Present-day crustaldeformation in China constrained by Global Positioning System meas-urements[J].Science,(294):574-577.
Zumberge J F,Heflin M B,Jefferson D C,et al.1997.Precise pointpositioning for the efficient and robust analysis of GPS data from largenetworks[J].J.Geophys.Res.,(102):5005-5017.
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