潮汐应力与云南及邻区的地震

提出了潮汐应力对发震断层的力学模式，描述了附加潮汐应力对发震断层的促滑作用方式，并将该模式应用于云南及邻区的地震，计算了173个地震震源处沿主压应力P轴和主张应力T轴方向的附加潮汐应力分量，分析了这睦量对发震断层的作用方式以及受潮汐应力促滑作用的发震断层类型，结果表明，所研究的云南及邻区发生的173个地震中，64％的地震发震断层受到潮汐应力的促滑作用，其中，受减压型促滑作用的发震断层数比例略大于受增压型促滑作用的发动层数比例；在受到潮汐应力促滑作用的111个发震断层中，走滑型发震断层占67％，倾滑斜滑型发震断层占33％，说明云南及邻区的走滑型地震较易受到潮汐应力的触发作用。

Tidal Stress and Earthquakes in Yunnan and Its Neighbor Area

The mechanical modal of tidal stress effects on seismic faults is proposed.The ways of mechanical effects on seismic faults by tidal stress components is described.The modal is applied to the earthquakes of Yunnan and its neighbor area.Tidal stress components along P axis and T axis of 173 earthquake focuses are calculated.Patterns of tidal stress effect on the earthquake faults and the types of seismic fault under slip accelerating effect of tidal stress are analyzed.The results indicate that the proportion of the numbers of seismic faults affected by slip accelerating effect of tidal stress is 64% of the 173 earthquakes;Proportion of the numbers of seismic faults affected by the compression reducing type is slightly larger than that affected by the compression adding type;Among 111 seismic faults which is affected by slip accelerating effect,the proportion of strike slip faults is 67% and the proportion of dip oblique slip faults is 33%.This shows that the earthquakes of strike slip type are more liable to be triggered by tidal stress.