A mild earth tremor, estimated by the geophysical institute of the Bulgarian Academy of Sciences at 2.6 magnitude on the Richter scale, was registered 31km southwest of Bulgarian capital Sofia on September 14.
The tremor was felt at 2.32pm local time (11.32pm GMT) and its epicentre was at a depth of two km, data from the institute’s earthquake tracking database showed. It was not immediately reported by the US Geological Survey or Geofon programme of the GFZ German Research Centre for Geosciences, which track earthquake activity worldwide.
The tremor’s epicentre was in the same area as the 5.8 magnitude earthquake on May 22, the strongest recorded in Bulgaria since 1986. The quake caused structural damage to dozens of homes in Sofia and the nearby town of Pernik, but there were no fatalities. A milder earthquake in the same area, measuring 4.6 magnitude, was recorded on July 14.