The depth was kilometres

An earthquake was registered at 8.41 AM today with epicenter close to Elin Pelin, some 30 kilomteres East-Northeast of Sofia.  

According to the Seismological centre of the National Institute of Geophysics, Geodesy and Geography with the Bulgarian Academy of Sciences the earthquake measured 2.8 on the Richter scale, and was at a depth of 20 kilometres.