Analysis Of The Crustal Deformation In The New Form Of Geodetic Coordinate System

The earth's surface is the system of the lithosphere with the hydrosphere, atmosphere, and biosphere. Under the influence of a variety of interior and external forces, the earth's surface is moving and deforming from time to time. As the rapid development of modern space technology, the stronger tools shall be provided for monitoring the earth's deformation, especially in the global area, and so, we have obtained the capacity of measuring the earth's deformation rapidly and accurately at any position of the world. In order to analyze the deformation in a larger area, conventional solution in a plane coordinate system can not satisfy the requirement of high accuracy, and a new kind of means of analyzing earth's deformation directly based on the ellipsoidal surface is proposed in this paper.On the basis of the new form of geodetic coordinate system, which is defined and built up by my tutor-professor Shi, geometrical quantities are expressed by those parameters in the new geodetic coordinate system to unitedly define 3D geometrical quantities and variation of certain positions on the ellipsoidal surface. This kind of expression of measurement and metric tensor is based on the earth's surface in the new form of geodetic coordinate system to depict the terrene as a curved surface, so compared with the conventional 3D displacement in the topocentric horizontal coordinate system, it is not only convenient for calculating internal geometric properties, such as length, angle, area, etc. but also further indicating the geometric properties of surface deformation related with curved interspaced shape.Via calculating data of two stages of GPS deformation monitoring net in Shanghai with the method of obtaining minimal absolute value of the single norm of coordinate difference to define relative stable points, abnormal displacement in local area could be well reflected. Moreover, the geometric model of 3D deformation of earth's surface and strain analysis in a larger area is contributed to express and analyze the characteristics of geometrics and mechanics of crustal deformation more comprehensively and accurately.