1928 Chirpan–Plovdiv earthquakes
The Chirpan–Plovdiv earthquakes struck central Bulgaria, south of the Sredna Gora on two separate days in April 1928. The event consisted of two main earthquakes that had a moment magnitude of 7.1 (), occurring four days apart on the 14th and 18th respectively. Major damage was reported, with over 70,000 buildings collapsing. An estimated 127 people died in both earthquakes, with many thousands affected in its aftermath. The two powerful earthquakes could also be felt in Greece, where they also caused significant damage. The total cost of damage totaled 5 billion Bulgarian lev.