Аннотация:New data and information about the ancient seismic events affected the archaeological sites on the Northern Bulgarian Black Sea coast are observed, collected and interpreted. Almost all seismic effects to the investigated archaeological sites, structures (excavated or surface), or rocks are expressed as fallen stones or bricks or cracks, or different deformations to the possible epicenter. The calibration curve derived from the macroseismic map of the M7.2 seismic event of 31st March, 1901 is used for the investigated objects to transform observed seismic effects to the intensities. The variations in distances and respective intensities cover the observed effects and give the possibility of eventual reconstruction of the acting forces, their directions and correct interpretation of the observations. The proved of the suggested interpretations confirmed the seismic effects to the investigated objects. In total eight historical and archaeological sites on the Northern Bulgarian Black Sea coast have been investigated.
