中国地壳运动观测网络基准站GPS观测的位移时间序列结果

对中国地壳运动观测网络基准网于1998年9月－2001年10月GPS连续观测结果所获得的位移时间序列进行了初步分析，讨论了适用于地震分析预报的位移时间序列生成中的基准选择。选东部长期相对水平位移很小的9个站组成的一组稳定点作为基准，得到水平位移时间序列；选分布于不同区域相对垂直位移较小的7个站为稳定点组，得到垂直位移时间序列。2000－2001年我国西部的基准站出现2次明显的水平与垂直位移异常变化，这种异常变化有可能与南北地震带上云南地区发生的6级左右地震活动有一定的关系。

TIME SERIES OF DISPLACEMENTS FROM GPS OBSERVATION AT FIDUCIAL STATION IN THE CRUSTAL MOVEMENT OBSERVATION NETWORK OF CHINA

A preliminary analysis on the time series of displacements from continuous GPS observations at fiducial stations during Sept. 1998 to Oct. 2001 in the CMONC(Crustal Movement Observation Network of China) is made in this paper. The selection of datum for displacement time series which is suitable for earthquake prediction is discussed. Time series of horizontal crustal displacements are obtained by defining a datum of a stable group of 9 stations with very small horizontal displacements in the eastern part of China. Time series of vertical crustal displacements are obtained by defining a datum of a stable group of 7 stations scattered in different regions with relatively small vertical displacements. During 2000 to 2001 anomalous horizontal and vertical displacements appeared twice at fiducial stations in the western part of China. These anomalies may be related with the seismic activities of magnitudes about 6 in the Yunnan region on the South North seismic belt.