Intraplate Deformation of Asia Derived from ITRF2000 Velocity Field
摘要
The definition of an intraplate fixed frame remains a significant error source for crustal motion studies at a few millimeters per year level. An appropriate implementation of such a frame is very important to avoid biased velocities and to confirm a valid geophysical interpretation. Here, we establish the newest global plate motion model of ITRF2000VEL and research the definition of an Asian-fixed frame in Asia using the ITRF2000 velocity field. By X2 and F ratio tests, we find a subset site in Asia that satisfies a rigid rap rotation with residual velocities ＜0. 95 mm/a and provide a Asia reference frame (SARF). In this reference frame, we find residual velocities at Asiatic ITRF2000 sites that are consistent with known active tectonic feature. An important result of this study is the identification of internal deformation of the order of 1-2 mm/a in an area usually interpreted as stable Asia. These results should be further checked as newer, denser and more accurate space geodetic data sets with longer observation time span, which become available for Asia.