オスマン語
On 11 April 1855, an aftershock of the 28 February earthquake was recorded as 6.65±0.33. This aftershock affected the region from Gemlik to Mudanya. 1,300 people died. Gökmen-zâde Seyyid el-Hâcî Hüseyin Rıfat Efendî Bursavî wrote about these earthquakes in his book "İşaret-numa", written in the Ottoman Turkish language.