The focal mechanisms of aftershocks of the focal zone of the Spitak earthquake of December 7, 1988, have been constructed. The method of averaged mechanisms is applied using data from the international seismological center. Along the boundaries of active faults of the study area, four blocks are distinguished with pairs of compressive tension forces different in directions. The prevailing types of movements in the foci of the Spitak earthquake aftershocks are revealed. It is shown that the prevailing uplift type of movement in the aftershock foci changes from the rupture of the Spitak earthquake in the northern and southeastern direction to the predominant shear type. Solutions of the averaged mechanisms for the selected blocks, the parameters of faults, the angles of incidence and strike, and the types of movements are obtained. It is shown that the nodal planes reflect tectonically active faults.

中文翻译：

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平均余震机制构建的Spitak震源区破裂面参数

1988年12月7日斯皮塔克地震震源区余震震源机制已经建立。平均机制的方法是使用国际地震中心的数据应用的。沿研究区活动断层边界，以不同方向的成对压缩拉力区分四个块体。揭示了斯皮塔克地震余震震源的主要运动类型。结果表明，余震震源的隆起运动类型由北、东南方向的Spitak地震破裂为主转变为剪切型为主。获得了所选区块的平均机制、断层参数、入射角和走向角以及运动类型的解。