9LARSON K M, AGNEW D C. Application of the globalpositioning system to crustal deformation measurement: 1.Precision and accuracy[J]. Journal of Geophysieal Researeh, 1991, 96(B10): 16547- 16565.
10MATTIOLI G S, DIXON T H, FARINA F, et al. GPS measurements of surface deformation around Soufriere Hills Volcano, Montserrat from October 1995 to July 1996[J]. Geophysical Research Letters, 1998, 25(18): 3417-3420.
