Study on Secular Influence Factors of Station's Vertical Displacement

摘要

Considering various dynamic factors, the instantaneous position of the solid Earth's surface is influenced by plate motion, regional tectonic detection, postglacial rebound and other local deformations which will directly affect their veracity and consistency of global vertical datum's definition. The secular factors influencing on station's vertical displacement was analyzed and discussed such as postglacial rebound, land subsidence and so on. The origin of those factors and the changed level of vertical displacement are also discussed, and how to detect and forecast those deformations and movements are as well as involved. In the end, a method to establish global vertical datum of the crustal motion is put forward, which takes Satellite Laser Ranging (SLR) vertical velocity fields as reference datum of vertical motion of the crust, and also is validated by using the vertical velocity fields of SLR technology based on ITRF2008.