Quantitative analysis of the deformation structure and use and development of the Mohr circle

Abstract：Simultaneously with the founding of the hypothesis of plate tectonics in the 1960s, another revolution, i.e. quantification of deformation structure analysis instead of qualitative analysis, took place. The important marker of the quantification is the introduction of the Mohr circle construction from mechanics into structural geology and improvement and development of it. The finite strain Mohr circle has been established for the analysis of large deformation and the polar Mohr circle has also been established in order to adapt to general shear deformation. Chinese geologists have made their due contributions.