Earth Planets Space, Vol. 60 (No. 5), pp. 519-528, 2008
Eun Soo Lee1, Young Wook Lee2, and Jung Hyun Park3
1Department of Cadastral Information, MyongJi College, 356-1 Hongen3-Dong, Seodaemun-Gu, Seoul 120-776, Korea
2Institute for Geomatics, Korean Association of Surveying & Mapping, Dongyang Tower B/D 93-1 Dangsan-dong 4Ga, Youngdeungpo-Gu, Seoul 150-722, Korea
3National GNSS Research Center, Remote Sensing Department Satellite Operation & Application Center, Korea Aerospace Research Institute, 45 Eoeun-Dong, Youseong-Gu, Daejeon 305-333, Korea
(Received September 1, 2006; Revised September 4, 2007; Accepted October 7, 2007; Online published May 16, 2008)
The displacement of the SAMP GPS station located in Medan City, Indonesia, is analyzed by means of an on-line point positioning method, the Canadian Spatial Reference System-Precise Point Positioning (CSRS-PPP). Based on the comparison of the results obtained with those from previous studies, we propose that CSRS-PPP can be applied to analyses of the displacement of a GPS station. Previous studies have focused solely on the "Sumatra-Andaman Islands Earthquake of December 26, 2004"; in contrast, we provide here an in-depth analysis of the crustal movements at the SAMP station for an expanded period of 2.5 years. CSRS-PPP, an Internet data processing service of the Department of Natural Resources Canada (NRCan), was used to process the data obtained at the SAMP station from January 2004 to July 2006. The data show a clear displacement in the southwestern direction from December 26, 2004 to March 28, 2005 when two major earthquakes occurred. However, after the midpoint of 2005, the data show displacement at a regular speed. In particular, the "Sumatra-Andaman Islands Earthquake (Mw = 9.0) of December 26, 2004" led to a displacement of 0.1387 m (dn = -0.0122 m, de = -0.1382 m) to the southwest. The earthquake (Mw = 8.7) that occurred on March 28, 2005 led to a displacement of 0.1921 m (dn = -0.1400 m, de = -0.1315 m) to the southwest. Starting from December 26, 2004, displacement to the southwest continued. From April 2005, however, the speed of the displacement gradually slowed down. The dn variation shows a displacement at a regular rate (-55.69 mm/year) from April 28, 2005 to July 2006, while the de variation shows a displacement at a regular rate (-23.66 mm/year) from July 5, 2005 to July 2006.
Key words: Displacement, GPS station, Indonesia, CSRS-PPP, dn variation, de variation.