水平主应力的相对方向与地区稳定性
THE RELATIVE DIRECTION OF THE PRINCIPAL HORIZONTAL STRESS AND REGION STABILITY
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摘要: 本文结合水压致裂实测应力方向讨论了主应力与断层面走向的相对方向及其变化对地震孕育、发生的影响。得出,在远低于发震应力条件下,活断层面间就可能发生粘滞滑动,不同的相对方向下,相对滑动导致不同的结果。山主应力的相对方向判断一个地区的稳定性,可靠性应该是很高的。Abstract: In this paper, the effects of relative directions of principal stress and the fault trend and their variation on the preparation of earthquakes have been discussed along with stress direction measured by the hydrofracturing. It is obtained that the viscous slip may occur on the surfaces between the active faults under the condition of the stress far less than the seismic stress; and the relative slip at different direction may result in various effects. The reliability of the judgment for a region stability from the relative direction of principal stress should be very high.