The primary source for this earthquake is the chronicle of
Michael the Syrian (12th century). The narrative reports that it took place on a Friday of the month June (Haziran in the original text). Michael dates the event to year 1151 of the
Seleucid era (Anno Graecorum), which corresponds to the year 840
Anno Domini. According to Michael's narrative, eight
towers of Erzurum's
defensive wall collapsed due to the earthquake. He also reports the collapse of many houses. He estimates that about 200 people were killed by the earthquake. Tremors continued for two months following the initial earthquakes, forcing the surviving locals to move to the city's fields. They lived in fear of a second earthquake. The Armenian
epitome of Michael the Syrian's chronicle omits the earthquake. The original chronicle features an unreliable
chronology, so there are doubts concerning the date and location of this earthquake. The city of Erzurum has been reconstructed several times. No archaeological and architectural data have been connected to this earthquake. ==References==