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介绍了中国地壳运动观测网络 1 998～ 1 999年基准站 GPS观测概况 ,简要介绍了用伯尔尼 (Bernese)软件对 GPS观测数据的处理结果 ,详细介绍了所获取的 1 998年 9月初～ 1 999年 7月初基准网地壳运动 ,包括各基准站位移与网内各部分的应变 .在所述观测期间 ,我国东部地区较为稳定 .相对东部地区 ,西南部地区以向北运动为主 ,位移量约 1 7mm,受北北东向挤压为主 ;西北部地区以北西向运动为主 ,位移量约 1 1 mm;而云南地区以向南运动为主 ,位移量约 1 4 mm.我国中部南北地震带则是一强烈的剪切变形带 .网内最大主应变量为2 .9× 1 0 -8.观测结果表明 ,印度板块向北挤压依然是影响我国地壳运动的主要因素 .
This paper introduces the survey of the GPS observations of the crustal movement observation network in China from 1998 to 1999. It briefly introduces the processing results of the GPS observation data by the Bernese software and details the results obtained from the beginning of September 1998 to January 999 During the observation period, the eastern part of our country is relatively stable. Relative to the eastern part, the southwest part is dominated by the northward movement and the displacement is about 1 7mm, which is dominated by the north-north eastward extrusion; the northwestern part is mainly northwestward with a displacement of about 11 mm; while the south of Yunnan is dominated by a southward movement with a displacement of about 14 mm. The seismic belt is a strong shear deformation zone.The maximum principal strain in the network is 2.9 × 10 ~ 8. The observation shows that the northward compression of the Indian plate is still the main factor affecting the crustal movement in China.