Abstract
The focal mechanisms of foreshock, main shock, and 190 aftershocks of the Spitak earthquake, which occurred on December 7, 1988, were obtained using the signs of the first motion of body waves. The focal mechanisms of the aftershocks with magnitude M > 4 are completely representative ones and about 70% of the focal mechanisms of the aftershocks with M > 3.3 have been determined. The change in types of focal mechanisms of the aftershocks was observed from the second day of the main shock onwards. The prevailing types of motion on the first day (December, 7, 1988) were normal and strike-slip motions. The majority of the aftershocks beginning December, 8th were characterized by reversed and strike-slip motions. Vertical motions along a subvertical fault plane were observed during the aftershocks. Some characteristic types of focal mechanisms in different parts of the aftershock zone have been selected. Peculiarities of the aftershock distribution and types of focal mechanisms for each part of the zone are discussed. The result of this investigation may create a basis for a model of the aftershock processes.
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