Abstract:In order to study the variation characteristics of strain field in Sheshan area, three sets of annual strain rate, maximum shear strain rate and their responses are obtained using the borehole-lined model formula, the variation and difference values of observed data from 2013 to 2018 of Sheshan station, and three strain conversion methods, including no correction, change correction and difference correction. Three sets of surface strain annual rate, maximum shear strain annual rate change and strain main direction calculation results were obtained.It is found that the difference value is more effective in calculating the main direction of strain and extracting the characteristic curves of annual strain rate and maximum shear strain rate.
NI Youzhong,YE Qing,ZHU Guohao et al. On Variation Characteristics of Main Strain and Main Direction in Sheshan Area Using Four Element Borehole Strain Observations[J]. jgg, 2019, 39(10): 1091-1095.