Establishing a Horizontal Velocity Model for a Semi-dynamic Datum of Taiwan

• Main Authors: Syu-ShenKuo, 郭徐伸
• Other Authors: Ming Yang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/80361158393998465761

碩士 === 國立成功大學 === 測量及空間資訊學系 === 102 === Taiwan is located at the plate boundary between the Eurasian plate and Philippine Sea plate. There is significant crustal deformation due to the collision between plates. However, current geodetic datum of Taiwan is a static geocentric datum, in which coordinates of control points are held fixed. Therefore, relative accuracy between control points decreases with time. The objective of this research is establishing a horizontal velocity model into the original static datum let it can be semi-dynamic datum. We use velocity field from 1110 Global Positioning System (GPS) stations and Kriging method to establish a horizontal velocity model. In the external validation of velocity model, the RMS residual were 2.4 mm/year for the east and 1.8 mm/year for the north components. The accuracy result is close to the accuracy of western contiguous United States (CONUNS) and New Zealand velocity model. However, the accuracy of velocity model is not consistent at different districts, it is highest in central and northern Taiwan, lower in southwestern Taiwan, and lowest in eastern Taiwan. Assuming no large deformation event (ex. earthquake), adopting the velocity model to implement semi-dynamic datum can effectively maintain relative accuracy between control points.