General Strain Rosette Method and its Application to the Computation of Geo-Strain Rate in Chinese Sichuan-Yunnan Area

doi:10.7523/j.issn.2095-6134.2005.3.006

Abstract

Abstract:

GPS (global positioning system) velocity can be used to calculate the horiwntal strain rate，but it should be done with great care because digital differentiation is involved，which brings about a prominent problem in minimizing the error. In this paper,a general strain rosette method(GSRM) is proposed，in which the plane strain rosette method in engineering is widened to include spherical earth surface. Then the GSRM is compared with the least squares collocation method (LSCM) in specific case by a digital experiment in which displacements and the strain field are known. The result shows that the accuracy of strain rate computed by GSRM is higher than that of L SRM.Finally，with Chinese Sichuan-Yunnan area as an example,the strain rate is calculated by GPS data and some discussions of computation methods and results are made.

Key words: GSRM, LSCM, GPS measurements, geo-strain rate field, Sichuan-Yunnan area

CLC Number:

P541

ZHU Shou-Biao, SHI Yao-Lin. General Strain Rosette Method and its Application to the Computation of Geo-Strain Rate in Chinese Sichuan-Yunnan Area[J]. , 2005, 22(3): 292-302.

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