PHYSICAL BASIS AND SPATIAL NATURES OF A COORDINATE SYSTEM
Huang Shengming 1) ; Liu Xuyan 1) ;,Liang Quanqiang 2) ; Ji Yingfeng 3) ; and Li Hua 1)
1)Earthquake Administration of Fujian Province,Fuzhou 3500032)Xianmen Research Centre of earthquake Surveging,Xiamen 3610213)Faculty of Science,Kobe University,Rokkotaimachi 1-1,Nade,Kobe 657-8501 Japan
Abstract By outlining the spacetime theory in Newtonian mechanics and Einstein’s Relativity, it is pointed out that the crustal movement is a kind of macrophenomenon of low speed. Thus adopting the Newtonian mechanics to describe position of a crustal particle as well as how it is changed by external forces along with the time are absolutely feasible, and a reference frame without any motion of acceleration is pretty necessary for depicting a crustal movement in a right way by using the Newton Laws. That is, a reference frame in accordance with the Newton inertia Law is one of the physical foundation of coordinate system for the purpose of crustal motion analysis. Considering that different coordinates have their own metric tensors in the respective virtual space on reference surface, they also have different sets of intrinsic geometric properties .Finally, a discussion on the spatial natures of the Cartesian, plane and spherical coordinate systems is made.
