Mechanical analysis of en echelon structure and its significance of controlling earthquakes |
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| Authors: | Xin-Sheng Xie and Xiao-Ping Ruan |
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| Institution: | (1) Institute of Crustal Dynamics, State Seismological Bureau, 100085 Beijing, China |
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| Abstract: | The paper deals with the mechanical origin and rules ofen echelon folds and their secondary fractures by means of elastic stability theory and nonlinear fracture criterion. Obtains the quantitative
relations amongen echelon angles ofen echelon folds, ratios of boundary stresses anden echelon pitches of shear zone under an action of general boundary forces (tension shear, pure shear or compression shear). As an
applied example, the paper researches the displacement field, stress field, distortion energy distribution, state of secondary
fractures and energy released by fracturing ofen echelon fold structure developed at the east foot of Taihang Mountain. The results of research show that maximum principal (compressive)
stresses, maximum shear stresses, high value area of distortion energy are in the nuclear parts ofen echelon folds. In these parts compressive fractures were easily developed in approximately parallel with fold axis. So it is verified
that the secondary fracture ofen echelon folds is a mechanism controlling a strong earthquake. |
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| Keywords: | en echelon structure stress ratio en echelon angle secondary fracture state structure controlling earthquake |
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