On traces of a strong earthquake in walls of the Sary-Bulun medieval sites along the great silk route (western Issyk-Kul Lake region, Northern Tien Shan)

The Sary-Bulun archeological sites located along the Great Silk Route of medieval times are studied. The study revealed a number of the deformations of seismogenic origin: tilts, shifts, and collapse and lateral bends of walls as well as long fissures in corner parts of the rooms. Judging by archeological artifacts, the seismic event occurred at the end of the 12th–beginning of the 13th century AD. Judging by degree of damage, the intensity of this ancient earthquake was I ≥ VIII on the MSK-64. The source of the seismic oscillations was apparently located in the faults cutting the active Boz-Barmak anticline. The studied archeological sites are located on the western limb of this anticline structure. In the medieval period, the Sary-Bulun settlements were the largest metallurgic centers of the Issyk-Kul depression and, thus, they are of a great significance for studying industrial processes of that time.

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