Significant advancement for the monitoring of crustal deformation in the Chinese mainland was accomplished in 1998 when the Crustal Movement Observation Network of China (CMONOC) was established. This National Key Scientific Infrastructural Project provides important information on present-day crustal deformation that can be used for many aspects of earth sciences such as navigation, positioning, and surveying. The principal GPS data used for this study come from the CMONOC collected from 1998 to 2004, including 27 fiducial stations which operate continuously since 1988, 56 basic stations observed annually with an occupation of at least 7 days (approx 168 hours' data collection) in each survey, and 961 regional stations observed in 1999, 2001, and 2004 with an occupation of at least 3 days (approx 72 hours' data collection) in each survey.
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